JP2011201291A - Runner discharge device and injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly separate a runner holding part and a runner part from each other even if a holding force of both part is set high.SOLUTION: The runner discharge device includes: a runner locking member having a runner holding part forming a runner and holding a runner part formed after molding; a driving means moving the runner locking member between a mounting position where the runner holding part is mounted to a mold and a non-mounting position; and a separation means separating the runner part from the runner holding part. The runner locking member includes a first member having a first forming part forming a part of the runner holding part, and a second member having a second forming part forming the runner holding part, together with the first forming part. The first member and second member are openably and closably provided between a closed position where the first forming part and second forming part form the runner holding part, and an opened position where the first forming part is separated from the second forming part compared to the case at the closed position.

Description

  The present invention relates to a runner discharge device for an injection molding machine.

  2. Description of the Related Art An injection molding machine that injects a molding material from a nozzle into a mold to form a molded product is known which has a mechanism for extracting a runner formed with the molded product from the mold when the mold is opened (patent) References 1, 2). This type of mechanism includes a runner lock member having a runner holding portion that forms a runner through which molding material passes and holds a runner portion formed after molding, a mounting position at which the runner holding portion is mounted on a mold, And a drive mechanism for moving the runner lock member between the non-attached position. The runner holding portion and the runner portion are separated from each other by, for example, colliding the runner portion with the collision member in the process of moving the runner lock member from the mounting position to the non-mounting position.

JP 2003-117950 A JP 2007-111976 A

  When the runner lock member is removed from the mold by moving the runner lock member from the mounting position to the non-mounting position, if the runner part falls off and returns to the mold side, the runner part that has been dropped is removed. Therefore, the work may have to be interrupted. Therefore, it is desirable that the holding force of the runner portion by the runner holding portion is higher, but in that case, it may be difficult to separate the runner holding portion and the runner portion. If the runner portion remains attached to the runner holding portion, the work cannot be transferred to the next molding, and the work may still need to be interrupted.

  An object of the present invention is to smoothly separate both of the runner portions even when the holding force of the runner portion is increased.

  According to the present invention, a runner lock member having a runner holding portion for forming a runner through which a molding material passes and holding a runner portion formed after molding, and a mounting position at which the runner holding portion is mounted on a mold, Drive means for moving the runner lock member between the non-attached position and separation means for separating the runner portion held by the runner holding portion from the runner holding portion, the runner lock member comprising: A first member having a first forming part that forms a part of the runner holding part; and a second member having a second forming part that forms the runner holding part together with the first forming part. The member and the second member include a closed position where the first forming part and the second forming part form the runner holding part, and the first forming part and the second member than when the first forming part and the second member are in the closed position. The formation part is separated Runner discharge apparatus is provided, wherein the open position, that openably provided between.

  According to the present invention, even when the holding force of the runner portion by the runner holding portion is increased, the two can be smoothly separated.

Explanatory drawing of the injection molding machine which concerns on one Embodiment of this invention. (A) And (B) is operation | movement explanatory drawing of a runner discharge device. (A) is a perspective view of a runner lock member, (B) is an exploded perspective view of a runner lock member. (A) And (B) is operation | movement explanatory drawing of a runner lock member. (A) thru | or (C) is operation | movement explanatory drawing of a runner lock member. (A) thru | or (C) is a figure which shows the example which provided the urging | biasing member. The figure which shows the other structural example of a drive unit. (A) And (B) is a figure which shows the other structural example of a runner holding | maintenance part. The figure which shows the other structural example of a runner holding | maintenance part. (A) And (B) is a figure which shows the other structural example of a runner holding | maintenance part. (A) And (B) is a figure which shows the other structural example of a runner holding | maintenance part. (A) is explanatory drawing of opening / closing operation | movement of the runner lock member by a cam mechanism, (B) is sectional drawing of the cam member in alignment with line II of FIG. 12 (A). (A) And (B) is explanatory drawing of the opening / closing operation | movement of the runner lock member by another cam mechanism. (A) And (B) is explanatory drawing of the opening / closing operation | movement of the runner lock member by another cam mechanism. The side view of a cam member and a collision member.

<Injection molding machine>
FIG. 1 is an explanatory diagram of an injection molding machine A employing a runner discharge device B according to an embodiment of the present invention. In each figure, X and Y indicate horizontal directions orthogonal to each other, and Z indicates a vertical direction. The injection molding machine A includes an injection cylinder 1 that injects molten resin into a mold 12 and 13 as an injection material (molding material), a fixed platen 2, and a fixed side that holds the fixed platen 2 and the mold 12. A mold plate holder 4, a movable mold plate holder 3 as a movable platen for holding the mold 13, a mold clamping hydraulic cylinder 8 for applying a mold clamping force to open and close the mold, and a movable mold A plate clamping cylinder connecting portion 7 for connecting the plate holder 3 and the mold clamping hydraulic cylinder 8 is provided. 5 is a tie bar and 6 is an angle.

  A mold 13 having a cavity portion C for forming a molded product is provided with a receiving plate 14, an ejector pin 18, a return pin 16, a return spring 17, and a cassette type ejector plate 15 and fixed from the left in the X direction in FIG. A cassette mold that can be attached to and detached from the side mold plate holder 4 is configured. In FIG. 1, 10 is an ejector connecting bar, and 11 is a return spring. The mold 12 is formed with a spool 12 communicating with the cavity portion C and a recess 12b in which the runner lock member 20 is mounted.

<Runner discharge device>
The runner discharge device B includes a runner lock member 20, a drive unit 30, and a separation unit 40. As will be described later, the runner lock member 20 has a runner holding portion 20a that communicates with the spool 12 and through which molten resin passes and that holds a runner portion formed after molding. .

  The drive unit 30 includes a motor 31, a ball screw shaft 32, and a ball nut 33 that meshes with the ball screw shaft 32. The ball nut 33 is connected to the runner lock member 20. The motor 31 rotates the ball screw shaft 32 so that the runner lock member 20 can linearly reciprocate in the X direction. With such a configuration, the drive unit 30 moves the runner lock member 20 between the mounting position (FIG. 1) where the runner holding portion 20a is mounted on the mold 12 and the non-mounting position. In the present embodiment, a ball screw mechanism is employed as the drive unit 30, but other mechanisms may be employed. Moreover, although the motor 31 is used as a drive source, other types of drive sources such as an air cylinder may be adopted.

  The separation part 40 is a structure for separating the runner part held by the runner holding part 20a of the runner lock member 20 from the runner holding part 20a. In the case of the present embodiment, the separation unit 40 is provided in the middle of the movement path of the runner part held by the runner holding part 20 a as the drive unit 30 moves the runner lock member 20. It is a collision member that performs separation by colliding with the runner portion by movement.

  As described above, in the present embodiment, the separation unit 40 uses the movement of the runner lock member 20 by the drive unit 30, but the separation unit 40 itself includes a collision member and a drive unit for moving the collision member, and is driven. It is good also as a structure which isolate | separates both by making a collision member collide with the runner part hold | maintained at the runner holding | maintenance part 20a by a part.

  Next, the operation of the runner discharge device B will be described. 2A and 2B are explanatory views of the operation of the runner discharge device. 2A and 2B, a portion of the runner lock member 20 in the vicinity of the runner holding portion 20a is partially shown as a cross-sectional view.

  When the molding is completed, the mold is opened and the mold 12 is separated from the stationary platen 2 as shown in FIG. In this state, the runner lock member 20 remains in the mounting position, and the runner portion P is held by the runner holding portion 20a. In the present embodiment, it is assumed that the runner portion P is separated from the molded product by mold opening. However, depending on the configuration of the mold, the runner portion P may remain connected to the molded product.

  Next, the drive unit 30 is driven to move the runner lock member 20 to a non-mounting position where the runner holding portion 20a is separated from the mold 12 as shown in FIG. On the way, the runner portion P collides with the separating portion 40 and is separated from the runner holding portion 20a.

<Configuration of runner holding part>
3A is a perspective view of the runner lock member 20, and FIG. 3B is an exploded perspective view of the runner lock member, showing a configuration in the vicinity of the runner holding portion 20a. The runner lock member 20 includes a first member 21 having a first forming portion 211 that forms a part of the runner holding portion 20a, and a second forming portion 221 that forms the runner holding portion 20a together with the first forming portion 211. Two members 22.

  The first member 21 and the second member 22 are the closed position where the first forming portion 211 and the second forming portion 221 form the runner holding portion 20a, and the first forming portion 211 and the second member 22 are more than the closed position. 2 is formed so as to be openable and closable between an open position where the forming portion 221 is separated. FIG. 3 (A) shows the case in the closed position. In the present embodiment, the first forming portion 211 and the second forming portion 221 are opened and closed by rotating the second forming portion 221 around the axis AX of the shaft body 23 provided on the first member 21. However, it is good also as a structure which both can rotate.

  The first forming portion 211 includes a first extending portion 212 extending in one direction (X direction), and a first leading end portion 213 extending from the distal end of the first extending portion 212 toward the second forming portion 221 side. It is substantially L-shaped in plan view. The second forming portion 221 also includes a second extending portion 222 extending in parallel with the first extending portion 212, and a second tip portion 223 extending from the tip of the second extending portion 222 toward the first forming portion 211. It has a substantially L shape in plan view.

  In the closed position shown in FIG. 3A, the gap S between the first extending portion 212 and the second extending portion 222 forms a space through which the molding material passes. That is, a runner is formed as a passage that is injected with molten resin from the gap S injection cylinder 1 and communicates with the spool 12a. The gap S has a tapered surface at the rear so that its cross-sectional area is slightly smaller in the downward direction, thereby preventing the runner portion P (FIG. 2) held downward from falling off. .

  The first tip portion 213 and the second tip portion 223 prevent the runner portion P from moving toward the mold 12 in the X direction. That is, when the runner portion P and the runner holding portion 20a shown in FIG. 2B are separated, the runner portion P jumps back to the mold 12 side due to the presence of the first tip portion 213 and the second tip portion 223. Can be prevented. This has the meaning of avoiding a situation in which the runner portion is sandwiched between the mold 12 and the mold 13 during the next molding.

  The first tip portion 213 and the second tip portion 223 have opposing end portions 214 and 224 that face each other. In the case of the present embodiment, concave portions 214a and 224a that form spaces communicating with the space S are provided in the opposing end portions 214 and 224, respectively. In the case of this embodiment, the cross-sectional shape (cut surface shape of Z surface) of the recessed parts 214a and 224a is a square, especially a square.

  The molten resin injected into the space S flows into the recesses 214a and 224a, and the inflow portion forms part of the runner portion P. In the case of this embodiment, since the opposed end portions 214 and 224 are separated from each other in the closed position, the molten resin flows between the opposed end portions 214 and 224, and the molten resin flows more reliably into the concave portions 214a and 224a. To do. Due to the presence of a part of the runner portion P formed in the recesses 214a and 224a, the runner portion P is difficult to move up and down, and the holding force of the runner portion P is increased compared to the case of the space S alone.

  Next, the first member 21 includes a first base 215 that extends from the rear end of the first extending portion 212 in the extending direction of the first extending portion 212, and the second member 22 includes the second extending portion 222. A second base portion 225 extending in the extending direction of the second extending portion 222 from the rear end is provided.

  The first base part 215 and the second machine part 225 are formed from the rear ends of the first extension part 212 and the second extension part 222, respectively, and are opposed to each other in the closed position. have. When the opposing side surfaces 215a and 225a are in close contact with each other, it is possible to prevent the molten resin injected into the space S from leaking here.

  The first base 215 includes an overlapping portion 215b whose thickness in the Z direction is substantially halved. A shaft body 23 is provided in the overlapping portion 215b. The second base 225 includes an overlapping portion 225b whose thickness in the Z direction is substantially halved. A shaft hole 23a through which the shaft body 23 passes is formed in the overlapping portion 225b. As shown in FIG. 3A, the overlapping portion 225b overlaps the overlapping portion 215b in the Z direction, the shaft body 23 is inserted through the shaft hole 23a, and the second member 22 is connected to the first member via the shaft body 23. 21 is rotatably supported. Due to the surface contact between the overlapping portion 225b, the bottom surface, and the overlapping portion 215b, the rotation of the second member 22 can be made smoother.

  The opening / closing direction of the second member 22 is the D direction (Y direction) shown in FIG. 3A. For example, the opening / closing direction of the second member 22 is the D ′ direction (FIG. 3A) ( Z direction). In this case, a shaft body and a shaft hole may be disposed on the axis AX ′.

<Operation of runner holding part>
Next, the operation of the runner holding portion 20a of the runner lock member 20 having such a configuration will be described. FIGS. 4A and 4B are explanatory views of the operation of the runner lock member. FIG. 4A shows the case where the first forming portion 211 and the second forming portion 221 are in the closed position. Indicates the case in the open position.

  When the runner lock member 20 after the mold opening shown in FIG. 2A is in the mounting position, the first forming portion 211 and the second forming portion 221 are in the closed position as shown in FIG. Yes, the runner portion P is held by the runner holding portion 20a. From this state, when the runner lock member 20 shown in FIG. 2 (B) moves to the non-attached position and the runner portion P and the separating portion 40 collide, the runner member P is exposed by the impact, thereby As shown in FIG. 4B, the first forming portion 211 and the second forming portion 221 open to the open position. As a result, the runner portion P is easily removed. Thus, in the present embodiment, even when the holding force of the runner portion P by the runner holding portion 20a is increased, the two can be smoothly separated.

  The first forming portion 211 and the second forming portion 221 that are opened at the open position need to be returned to the closed position at the time of the next molding. In the case of this embodiment, as shown in FIGS. 3A and 3B, the outer side surface 21a of the first member 21 and the outer side surface 22a of the second member 22 both taper the runner lock member 20 downward. An inclined surface having a tapered shape is formed. This inclined surface naturally returns to the closed position when mounted in the recess 12b of the mold 12. 5A to 5B are explanatory diagrams thereof.

  In the state of FIG. 5A, the runner lock member 20 is in the mounting position (the mold 12 is in the mold opening position), but the first forming portion 211 and the second forming portion 221 are in the open position. is there. FIG. 5B shows a state in which the runner lock member 20 enters the recess 12b as the mold 12 moves up. The first forming portion 211 and the second forming portion 221 are being shifted from the open position to the closed position while being guided by the inclined surface of the recess 12b. As shown in FIG. 5C, when the runner lock member 20 is completely attached to the recess 12b, the first forming portion 211 and the second forming portion 221 are located at the closed position. In this way, in the present embodiment, the first forming unit 211 and the second forming unit 221 can be opened and closed without requiring a separate drive mechanism.

<Other embodiments: biasing member>
In the above embodiment, the first forming portion 211 and the second forming portion 221 are configured to be in the closed position by using the recess 12b of the mold 12 and the inclination of the outer side surfaces 21a and 22a. A biasing member that constantly biases at least one of the first member 21 and the second member 22 may be provided so that the first member 21 and the second member 22 are in the closed position. In the above embodiment, since only the second member 22 is movable, the biasing member is configured as a member that biases the second member 22.

  FIG. 6 (A) shows an example thereof, in which a coil spring 24 is interposed between the first member 21 and the second member 22 as an urging member. FIG. 6B shows another example in which a coil spring 24 as an urging member is brought into contact with the second member 22 and is normally pressed in the direction of the closed position. FIG. 6C shows still another example in which a tension spring 24 as an urging member is engaged with the second member 22 and is normally pulled in the closed position direction. 6B and 6C, it is necessary to configure so that the urging member does not interfere with the mold 12 or the like.

<Other Embodiments: Drive Unit>
In the above embodiment, the drive unit 30 is configured to linearly reciprocate the runner lock member 20, but may be configured to rotate the runner lock member 20 to move. FIG. 7 shows an example, and the drive unit 30 ′ (for example, a motor) indicates the rear end portion of the runner lock member 20 and turns as shown in FIG. Move.

  Further, in the example shown in the figure, the separating portion 40 ′ is provided in the middle of the movement path of the runner portion P held by the runner holding portion 20a as the runner lock member 20 is turned by the drive unit 30 ′. The collision member which collides with the runner part P by the turning of is constituted.

  According to such a configuration, the runner member P can be caused to collide more strongly with the separation portion 40 ′ with less space and a smaller driving force compared to the configuration in which the runner lock member 20 is linearly reciprocated. .

<Other Embodiments: Configuration of Runner Holding Unit>
Various configurations other than the configuration shown in FIG. 3 can be adopted as the configuration of the runner holding portion 20a. 8 to 11 show other configuration examples of the runner holding portion 20a. In each figure, each symbol indicates the configuration indicated by each symbol in FIG. 3 unless otherwise specified.

  FIG. 8A shows a configuration in which a concave portion 224 a is provided only in one of the opposing end portions 224 and 224. As described above, the concave portion can be provided in at least one of the opposed end portions 214 and 224.

  FIG. 8B shows a configuration in which the facing end 214 of the first tip 213 and the facing end 224 of the second tip 223 are in contact with each other except for the recesses 214a and 224a in the closed position. is there. Although this configuration is inferior to the example of FIG. 3 in terms of the filling property of the molten resin into the concave portions 214a and 224a, there is an advantage that the runner holding portion 20a is structurally stable.

  FIG. 9 is an example in which convex portions 214a ′ and 224a ′ are provided in place of the concave portions at the opposing end portion 214 of the first tip portion 213 and the opposing end portion 224 of the second tip portion 223. Also in this configuration example, there is an effect that is not significantly different from the concave portion. The convex portion can be provided on at least one of the opposed end portions 214 and 224.

  10 and 11 are examples in which the recesses 214a and 224a are narrow according to their depths, and the cross-sectional shapes are also different. By making the recesses 214a and 224a narrow according to the depth, the separability can be improved when the runner portion P is separated from the runner holding portion 20a.

  In the example of FIG. 10A, the recesses 214a and 224a have a square cross-sectional shape, in particular, a triangular shape. The example of FIG. 10B is an example in which the recesses 214a and 224a are square in cross section, in particular, triangular, and the opposite ends 214 and 224 are entirely formed as recesses 214a and 224a. .

  In the example of FIG. 11A, the recesses 214a and 224a have a square cross-sectional shape, in particular, a trapezoidal shape. In the example of FIG. 11B, the cross-sectional shape of the recesses 214a and 224a is an arc shape.

<Other embodiment: Opening and closing of runner lock member by cam mechanism>
The runner lock member 20 may be opened and closed using its movement and a cam mechanism. FIG. 12A is an explanatory view of the opening / closing operation of the runner lock member 20 by the cam mechanism. In the example of the figure, a cam member 50 that contacts the runner lock member 20 is provided above the runner lock member 20.

  Grooves are formed in the cam member 50, and the inner surface forms a cam surface 50a. The runner lock member 20 is provided with an abutting portion 26 that abuts against the cam surface 50 a on the second member 22. 12B is a cross-sectional view of the cam member 50 taken along line I-I in FIG. 12A, and the runner lock member 20 is also illustrated. As shown in the figure, the abutting portion 26 is located on the upper portion of the runner lock member 20 so as to be in contact with the cam surface 50a.

  In the case of this embodiment, the contact portion 26 is a roller that is rotatably supported by a shaft 25 erected on the second member 22. Since the contact portion 26 is rotatable, the frictional resistance between the cam surface 50a and the contact portion 26 can be reduced.

  In the present embodiment, since the second member 22 rotates and opens and closes with respect to the first member 21, the contact portion 26 is provided in the second member 22. When the member 22 is configured to be rotatable with respect to each other, a configuration corresponding to the contact portion 26 may be provided on both the first member 21 and the second member 22, and the arrangement and configuration of the contact portion 26 may be provided. Can be appropriately designed according to the configuration of the runner lock member 20.

  The cam surface 50a is set to a “closed cam surface” that positions the second member 22 in the closed position on the side of the mounting position from the line L1, and the second member 22 is opened to the position on the non-mounted position side of the line L2. It is set to “open cam surface”. More specifically, the “closed cam surface” is offset to the upper side in FIG.

  With such a configuration, when the runner lock member 20 is moved by the drive unit 30, an opening / closing force is urged from the cam surface 50 a to the second member 22 via the contact portion 26. Then, the runner lock member 20 is closed on the mounting position side from the line L1 in FIG. 12A, and is opened on the non-mounting position side from the line L2.

  By opening and closing the runner lock member 20 with such a cam mechanism, the reliability of the opening and closing operation of the runner lock member 20 can be enhanced.

  The collision between the runner portion P and the collision member 40 is preferably performed while the runner lock member 20 is opened. For this reason, in the example of FIG. 12A, the collision position where the runner portion P and the collision member 40 (not shown) collide is set at the position of the line L3. A broken line 41 indicates the direction of the surface 41 of the collision portion of the collision member 40.

  When the runner lock member 20 moves from the mounting position to the collision member 40 side, the pre-collision position (the contact portion 26 is the position before the runner portion P collides with the collision member 40 when the runner lock member 20 moves to the collision member 40 side. The second member 22 can be positioned in the open position at the position positioned on the line L2. Further, by setting the normal direction d1 of the surface 41 of the collision member 40 to a direction different from the direction to the mold as indicated by a broken line 41, a reaction force is applied to the runner portion P in the normal direction d1 at the time of the collision. It is possible to suppress the runner portion P from jumping back to the mold side.

  In the example of FIG. 12, the case where the runner lock member 20 is reciprocated linearly has been described. However, the runner lock member 20 can be opened and closed by the cam mechanism even when the runner lock member 20 is swung and moved. . FIG. 13 and FIG. 14 show such examples.

  Referring to FIG. 13A, runner lock member 20 is supported by revolving arm 60. The turning arm 60 is provided so as to be rotatable about a shaft 61 as a rotation center, and rotational force is urged by a drive mechanism (not shown). FIG. 13A shows a case where the runner lock member 20 is located at the mounting position on the mold.

  The cam member 51 is disposed above the runner lock member 20 and the turning arm 60. In order to make the operation of the mechanism easy to understand, the cam member 50 is shown as a perspective view in which the lower part is seen through in FIGS. 13 and 14.

  The cam member 51 has cam surfaces 51 a and 51 b that come into contact with the contact portion 26. The cam surface 51a is a “closed cam surface” that positions the second member 22 in the closed position, and is set on the mounting position side from the line L11. The cam surface 51 a forms a virtual circular arc centered on the center of the shaft 61 with the radius of the distance between the peripheral surface of the contact portion 26 and the center of the shaft 61 when the second member 22 is in the closed position.

  The cam surface 51b is an “open cam surface” that positions the second member 22 in the open position, and is set on the non-mounting position side from the line L12. The cam surface 51b forms a virtual circular arc centered on the center of the shaft 61 with the distance between the peripheral surface of the contact portion 26 and the center of the shaft 61 when the second member 22 is in the open position as a radius.

  The cam member 51 is integrally formed with a collision member 42 that collides with the runner portion P. The collision member 42 is formed to extend downward from the cam member 51. FIG. 15 is a side view of the cam member 51 and the collision member 42, and a slit 42 b is formed in the collision member 42. The width of the slit 42b allows passage of the runner lock member 20, but is set so as to interfere with the runner portion P held by the runner lock member 20. For this reason, when the runner lock member 20 passes through the slit 42 b, the runner portion P collides with the collision portion 42 a of the collision member 42.

  Returning to FIG. 13, when the turning arm 60 is rotated from the mounting position of FIG. 13A, the runner lock member 20 turns, and the contact portion 26 reaches the cam surface 51 b as shown in FIG. 13B. . Due to the contact between the contact portion 26 and the cam surface 51b, the second member 22 is positioned at the open position and the runner lock member 20 is released. At this position, the runner portion P does not reach the collision portion 42a (pre-collision position).

  As the turning arm 60 advances, the runner portion P and the collision portion 42a collide as shown in FIG. As a result, the runner portion P is separated from the runner lock member 20. At this time, since the runner lock member 20 has already been opened, the runner portion P is smoothly separated. FIG. 14B shows a state in which the turning of the turning arm 60 is completed. In this embodiment, the turning is completed by turning 90 degrees from the mounting position. Since the normal direction d2 of the collision part 42a is 90 degrees from the mold direction and the runner part P collides with the collision part 42a during the turning of the runner lock member 20, the separated runner part P The reaction force is applied in a direction different from the direction to the mold, and the runner portion P can be prevented from jumping back to the mold side.

  The runner lock member 20 returns to the mounting position shown in FIG. 13A by rotating the revolving arm 60 by 90 degrees in the reverse direction from the state shown in FIG. 14B. As a result, the runner lock member 20 is closed.

  While various embodiments of the present invention have been described above, it goes without saying that the embodiments can be appropriately combined.

Claims (15)

A runner lock member having a runner holding portion for forming a runner through which the molding material passes and holding a runner portion formed after molding;
Driving means for moving the runner lock member between a mounting position where the runner holding portion is mounted on the mold and a non-mounting position;
Separating means for separating the runner portion held by the runner holding portion from the runner holding portion;
The runner lock member is
A first member having a first forming part that forms part of the runner holding part;
A second member having a second forming part that forms the runner holding part together with the first forming part;
The first member and the second member are:
A closed position where the first forming portion and the second forming portion form the runner holding portion, and an open position where the first forming portion and the second forming portion are separated from each other than when the first forming portion and the second forming portion are in the closed position. A runner discharge device characterized in that it can be freely opened and closed between the two. The first forming part is
A first extending portion extending in one direction;
A first tip extending from the tip of the first extending portion toward the second forming portion;
With
The second forming part is
A second extending portion extending in parallel with the first extending portion;
A second tip extending from the tip of the second extending portion toward the first forming portion;
With
In the closed position, the gap between the first extension part and the second extension part forms a space through which the injection material passes,
The first and second tip portions have opposing ends facing each other;
2. The recess according to claim 1, wherein a recess that forms a space communicating with the space is provided between at least one of the opposing end portions of the first and second tip portions. Runner discharger.   The runner discharge device according to claim 2, wherein the concave portion is narrow according to a depth of the concave portion.   The runner discharge device according to claim 2, wherein a cross-sectional shape of the recess is a square.   3. The runner discharge device according to claim 2, wherein in the closed position, the opposed end portions of the first and second tip portions are spaced apart from each other.   3. The runner discharge device according to claim 2, wherein in the closed position, the opposed end portions of the first and second tip portions are in contact with each other except for the concave portion.   An urging member that constantly urges at least one of the first member and the second member is provided so that the first member and the second member are in the closed position. Item 7. The runner discharge device according to any one of Items 1 to 6. The first member includes a first base extending in a direction in which the first extending portion extends from a rear end of the first extending portion,
The second member includes a second base extending in the extending direction of the second extending portion from a rear end of the second extending portion;
The first base portion and the second base portion are formed from rear ends of the first and second extending portions, respectively, and are provided with opposing side surfaces that face each other in the closed position. Item 3. The runner discharge device according to Item 2. The first base and the second base each have overlapping portions that overlap each other in the vertical direction,
A shaft provided on the overlapping portion of the first base,
The runner discharge device according to claim 8, wherein the second member is rotatably supported by the first member via the shaft body. The drive means moves by rotating the runner lock member,
The separating means includes
A collision member that is provided in the middle of the movement path of the runner part held by the runner holding part as the runner lock member turns by the driving means, and collides with the runner part by the turn of the runner lock member. The runner discharge device according to any one of claims 1 to 9, wherein   The runner discharge device according to claim 10, wherein the collision member includes a collision portion that applies a reaction force to the runner portion in a direction different from a direction toward the mold.   2. The runner discharge device according to claim 1, further comprising a cam member that contacts the runner lock member and opens and closes the first and second members as the runner lock member is moved by the driving unit. . The separating means includes
A collision member that is provided in the middle of the movement path of the runner part held by the runner holding part as the runner lock member moves by the driving means, and collides with the runner part by the movement of the runner lock member. ,
The cam member is
When the runner lock member moves from the mounting position toward the collision member, the first and second members are moved to the open position at a position before the collision between the runner portion and the collision member. The runner discharge device according to claim 12, wherein the runner discharge device is located at a position. The cam member is
The runner discharge device according to claim 13, wherein when the runner lock member moves from the pre-collision position to the mounting position, the first and second members are positioned at the closed position.   The injection molding machine provided with the runner discharge device of any one of Claims 1 thru | or 14.