JP2009255319A - Ejection pin pushing-out device and ejection pin operating unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a molding cycle time by allowing a molded article to certainly fall in a definite direction with a constant posture at a constant angle by pushing out an arbitrary place of the molded article to take out the molded article without damaging the appearance surface of the molded article and to form a takeout mechanism of the molded article compact by a simple constitution to dispense with a power supply and to always stably operate and simply attach and detach the takeout mechanism of the molded article. <P>SOLUTION: The ejection pin pushing-out device includes: the ejection pin 33 having a retreat spring; an operation pin 32 relatively moved in an axial direction with respect to an ejector plate 14; and an ejection pin operating unit 41 equipped with an arm member 43 which receives the pressing operation of the operation pin 32 at one end to be reversed at the other end and pushes out the ejection pin 33 toward the surface of a fixing side product. The arm member 42 is formed so that the distance from a spindle to the contact part with the ejection pin 33 at the other end becomes larger than the distance from the spindle to the contact part with the operation pin 32 at one end. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a protruding pin extrusion device and a protruding pin operating unit for protruding a protruding pin in an injection molding machine or the like to naturally drop and remove a molded product.

  Conventionally, in injection molding, a molded product that is filled with a high-pressure molten resin between a fixed side mold and a movable side mold and cooled and solidified is a molded product that does not place much importance on the appearance in its removal. It is naturally dropped on a tray, container or chute below the mold. On the other hand, molded products with an emphasis on external appearance are usually held using the automatic take-out machine such as a take-out robot, held one by one, released, and then transferred to a chute or conveyor for removal. Yes. That is, after injection molding, the automatic take-out machine lowers the vertical axis into the mold and the front and rear axes move forward, and sucks and holds the molded product with a suction pad, suction disk, etc. attached to the tip of the arm. After the mold, the mold moves backward from the movable mold and moves up to a chute or a conveyor to release the molded product. As a result, the molded product can be safely taken out after being released, without being damaged by coming into contact with a mold or a peripheral device.

  Here, in resin molding, shortening of a molding cycle time is conventionally required. For example, Japanese Patent Laid-Open No. 6-114897 describes an ejector control method that eliminates time loss by setting the ejector pin ejection speed to three stages to remove the sticking of the ejector pin to the molded product in a short time. Various technologies have been proposed for shortening. Naturally, shortening of the cycle time is also required for molded products that emphasize appearance. However, as described above, molded products with an emphasis on appearance are usually taken out using an automatic unloader by a robot, but after the mold is opened, the vertical axis descends into the mold, and the front and rear axes are molded. After moving forward to the product side, the molded product is sucked and held by a suction disk at the tip, etc., and after mold release, the molded product is held back while moving away from the movable side mold plate and further lifted and separated from the mold. Until this time, the mold could not be closed, resulting in a time loss during that time. Therefore, it is conceivable that a molded product with an emphasis on appearance should not be taken out by an automatic take-out machine by a robot but may be naturally dropped from a mold after molding. However, when dropping naturally, it is easy to cause variations in the way of dropping the molded product, especially in the case of plate-shaped molded products, it is easy to scatter in different directions, and it is difficult to stably drop in a fixed posture. Therefore, it is difficult to stably and reliably take out the molded product receiver, tray, chute, and the like protruding to the lower side of the mold. For this reason, it may hit the protruding part of the mold, contact peripheral devices such as molded product receivers and chutes, etc., get stuck, and the molded products may collide and interfere with each other, resulting in damage to the external surface. There were many.

  Therefore, there is a case in which a molded product is ejected by an ejector pin using an air cylinder and dropped by being pushed forward or pushed up. FIG. 10 shows a molded product take-out mechanism using an air cylinder in the movable mold 11 of the injection molding machine. In FIG. 10, an air cylinder 51 is attached to the bottom surface of the ejector plate 14, and the operating rod 52 of the air cylinder 51 abuts against the rear end of the projecting pin 53 due to air pressure-fed from an air compressor (not shown). The protruding pin 53 is pushed out to the fixed product surface side. The air cylinder 51 is controlled by a control valve such as a solenoid valve, and receives a molded product receiver in which an operating rod 52 is projected by an ejector advance completion signal to push out a projecting pin 53, and the molded product W naturally falls and protrudes to the lower side of the mold. After being taken out on the tray, chute, etc., the operating rod 52 is retracted. Then, when the operating rod 52 returns to the original position before the protrusion, the complete return is detected by the limit switch 54, and when the ejector plate 14 moves backward and the complete return is detected and confirmed by the reverse limit, the process proceeds to the next mold closing operation. To do.

In this case, the tip of the projecting pin 53 is projected longer than other commonly used ejector pins 20 by the air cylinder 51 provided separately, and a specific portion of the molded product W is ejected vigorously, and molding is performed with the force. The product W can be naturally dropped by flying in a certain direction. For this reason, the molded product is taken out into a container, a chute or the like without hitting the protruding portion of the mold or the like and without being scattered at a position disengaged. As a result, the cycle time can be shortened by the amount that can be taken out without damaging the appearance surface of the molded product W and can be taken out by natural fall.
Japanese Patent Laid-Open No. 6-114897

  However, in taking out the molded product W using the air cylinder 51, there are some problems as follows. First, in the ejection by the air cylinder 51, it is necessary to adjust by the speed controller in order to adjust the ejection balance by taking the timing of the ejection. However, since the air amount is not always constant and easily fluctuates, the ejection speed changes. The operation is unstable. For example, if the right and left balance of the protruding timing, protruding amount, and protruding speed of the protruding pins 53 of the air cylinders 51 provided on the left and right is lost, the protruding pins 53 on the back side of the paper surface of FIG. The molded product W tilts in the left-right direction as it is projected early or long, and falls with various postures and trajectories as shown by the solid line or two-dot chain line in FIG. Depending on the case, the appearance may be damaged. For this reason, it is necessary to frequently adjust the speed control in order to drop the molded product W stably.

  Next, a large number of wires and pipes are provided between the movable side mounting plate 13 and the ejector plate 14 for sending and discharging air to the air cylinder 51 and sending control signals. Since it is connected to the base and the air concentration block, the air cylinder 51 may not be installed freely in correspondence with any part of the molded product W, and the entire protrusion mechanism is enlarged, and the movable side mold It took a lot of work to disassemble and reassemble 11 repairs and maintenance. Furthermore, since the wiring and the number of pipes are arranged in large numbers, the fixed design surface is protruded from the pin 53 by disconnecting the pipe and wiring clamps, or by making a mistake in the forward / backward air coupler of the air cylinder 51. Could cause damage. In addition, dirt due to gas generated from the high-temperature and high-pressure molten resin in the mold accumulates in the gap between the operating portions of the projecting pins 53, which may cause resistance and cause malfunction. In order to send air to the air cylinder 51, a separate power source is also required. Further, although the air cylinder 51 can be shortened by natural fall, the air cylinder 51 starts to operate after receiving a forward signal due to completion of the ejector plate advancement, and the ejector plate 14 moves backward after receiving the air cylinder backward signal. Minute time loss occurred.

  Therefore, the present invention can protrude any part of the molded product and reliably drop the molded product in a certain direction at a certain angle and posture and take it out without damaging the appearance surface, thereby shortening the molding cycle time. In addition, it is an object of the present invention to provide a protruding pin push-out device and a protruding pin operating unit that can be compactly formed with a simple configuration, do not require a power source, always operate stably, and can be easily attached and detached. is there.

  According to another aspect of the present invention, there is provided a projecting pin push-out device, which is attached to an ejector plate through a retreating spring so as to be movable forward and backward in an axial direction, and is disposed in parallel with the projecting pin on a movable mold. An operating pin that moves relative to the plate in the axial direction, a base that is attached to the ejector plate, a pivot that is provided on the base, and is pivotably attached to the shaft. A projecting pin actuating unit including an arm member that reverses the other end by receiving a pressing operation and pushes the projecting pin in a fixed-side mold direction. The distance to the contact portion with the protruding pin at the end is larger than the distance from the support shaft to the contact portion with the operating pin at the one end.

  Here, the protruding pin is attached to an ejector plate and protrudes a molded product in the same manner as a commonly used ejector pin. The protruding pins are usually attached to one or more locations arbitrarily selected from the mounting setting locations of the other plurality of ejector pins, that is, they are mounted using the mounting locations of other ejector pins. This is because it is convenient to use an existing installation location. However, an installation hole may be newly provided at a location other than the installation location of these ejector pins, and the protruding pin may be attached here. As the protruding pin, various types such as those inserted into the sleeve pin and those not having the sleeve pin can be adopted. The projecting pin includes an urging spring, and after the molded product is released from the mold, the urging force of the urging spring returns to the original position on the movable mounting plate side independently of the other ejector pins. In order to prevent the die or the tip of the projecting pin from being damaged by performing the next mold closing in a state where it is not completely retracted back to the original position, generally, in claims 3 and 5 As described, a detector for detecting and confirming full return to the initial position is also attached.

  In general, the operating pin has a fixed end on one end side fixed to a movable side mold plate of a movable side mold by screwing, and protrudes from the movable side template toward the ejector plate in a vertical direction. It penetrates the ejector plate, and the tip on the other end side operates as a working part, which will be described later. The operating pin is fixed to the movable side mold independently of the ejector plate and is in a stationary state, and it is the ejector plate that actually moves in the movable side mold, but relative to the ejector plate. It is in a moving relationship.

  When one end of the arm member of the protruding pin operating unit is pressed by receiving a pressing operation due to the relative movement of the operating pin, the other end is reversed about the support shaft, and the protruding pin is moved in the direction of the fixed mold. In addition, the distance from the support shaft to the contact portion with the protruding pin at the other end is larger than the distance from the support shaft to the contact portion with the operation pin at one end. As a result, the amount of movement of the protruding pin is larger than the amount of movement of the operating pin, that is, the amount of movement of the ejector plate. And the protruding amount is large. Thereby, only the specific location where the protruding pin is pressed in the molded product can be protruded at a higher speed and longer than the protruding location of the other ejector pins. Here, by changing the ratio of the distance from the support shaft to one end and the distance from the support shaft to the other end, the protruding amount and speed of the protruding pin can be varied.

In the drop take-out unit of the molded product according to the second aspect, the protruding pin is attached at one or more positions arbitrarily selected from the attachment setting positions of the plurality of ejector pins attached to the ejector plate.
According to a third aspect of the present invention, there is provided a detector for detecting that the projecting pin is retracted through the retracting spring and returned to the position before the projecting after the molded product is ejected. Here, the detector also has functions such as an electromagnetic switch and a limit switch, and when detecting the return of the protruding pin, sends the detection signal to the control device.

  The protruding pin operating unit according to claims 4 and 5 corresponds to the protruding pin operating unit according to claims 1 and 3, respectively.

  In the first and fourth aspects of the present invention, the projecting pin operating unit is attached to the ejector plate, and in conjunction with the movement of the ejector plate, the projecting pin is moved relative to the ejector plate relative to the ejector plate by pressing the operating pin. Therefore, only the specific location where the protruding pin is pressed in the molded product can be projected at a higher speed and longer than the projected location of the other ejector pins. It is possible to make a natural fall to a certain place with a predetermined trajectory by drawing off with a great force. As a result, it is possible to prevent the appearance surface of the molded product from being damaged by contact or the like, and thus, it is possible to take out the molded product with an emphasis on the appearance by natural dropping, thereby shortening the molding cycle time.

  And since the protrusion pin action | operation unit is comprised by the arm member etc., it can form compactly with a simple structure. Further, since it operates in conjunction with the movement of the ejector plate, no power source is required. Furthermore, since the arm member or the like is formed with a simple configuration, it can always operate stably, and the protruding pin pushing device and the protruding pin operating unit can be easily attached and detached. Then, if the operating pin is removed, the molded product can be taken out by protruding only the conventional ejector pin, and according to the molded product, the movable side mold according to the present invention and the conventional movable side mold can be separated. It can be arbitrarily selected and switched for use.

In the invention of claim 2, since the projecting pin can be mounted at a position arbitrarily selected from the mounting setting positions of the plurality of ejector pins, the projecting pin can be easily installed by using the mounting hole of the ejector pin. In addition, the molded product can be naturally dropped in an optimal protruding state.
Since the invention according to claim 3 and claim 5 is provided with a detector for detecting that the protruding pin has returned to the position before the protrusion, the next mold closing is performed without the protruding pin being completely returned. It is possible to reliably prevent the mold or the protruding pin from being damaged.

  Hereinafter, a protruding pin extrusion device and a protruding pin operating unit according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. Here, FIGS. 1 to 7 show the protruding pin operating unit, FIG. 8 shows the state of the mold immediately after molding, and FIG. 9 shows the state of taking out the molded product. In the present embodiment, a rectangular plate-like body having an appearance-oriented surface on one side is illustrated as a molded product. In addition, although the fixed side mold | type and a movable side mold | type show what was arrange | positioned at right and left, for convenience of explanation, it may explain that a fixed side mold and a movable side mold are arranged up and down.

  In FIG. 8, a fixed mold 1 has a fixed mold 2 and a fixed mounting plate 3 mounted and fixed, and high-pressure molten resin is injected into the sprue 4 at high speed. Then, the molten resin is filled between the fixed product surface 2 a that is the cavity of the fixed template 2 and the movable product surface 12 a that is the core of the movable template 12, and the molded product W is formed.

  On the other hand, the movable side mold 11 includes a movable side mold plate 12 on which a movable side product surface 12a is formed, a movable side mounting plate 13, an upper ejector plate 15 for ejecting and releasing the molded product W, and an lower ejector plate. And 16 ejector plates 14. A spacer block 17 that forms a space for the ejector plate 14 to move is interposed between the movable side mold plate 12 and the movable side mounting plate 13 on both sides of the movable side mold 11. And a return spring 19 composed of a coil spring is mounted between the ejector plate 14 and the ejector plate 14 so that the ejector plate 14 is moved back to the original position on the movable mounting plate 13 side after the ejector plate 14 is moved forward. It has been. A rear end of an ejector pin 20 for projecting the molded product W is fixed to the ejector plate 14, and a through hole through which the ejector pin 20 is inserted is provided in the movable side mold plate 12. A plurality of ejector pins 20 are usually attached according to the shape or the like of the molded product W. When the molded product W is a rectangular plate-like body as in the present embodiment, the ejector pins 20 face portions such as the periphery of the molded product W. Many are arranged. At the center of the movable side mounting plate 13, an insertion hole 13a is formed through which an ejector rod 21 is inserted which contacts the lower surface of the lower ejector plate 16 of the ejector plate 14 and pushes the entire ejector plate 14 toward the fixed product surface 2a. The ejector rod 21 advances and retracts in the insertion hole 13a in the axial direction by hydraulic pressure or the like.

  Further, the movable die 11 is provided with a protruding pin extrusion device 31 which is a feature of the present invention. As shown in FIGS. 1 to 3, the protruding pin extrusion device 31 is a molding in which one end is fixedly attached to the movable side mold plate 12 and the plurality of ejector pins 20 are provided separately. A projection pin 33 for dropping the product W and attached to the ejector plate 14, and in conjunction with the movement of the ejector plate 14, the projection pin 33 is moved toward the fixed product surface 2 a side with respect to the ejector plate 14 by pressing the operating pin 32. And a projecting pin actuating unit 41 that is pushed out by relative movement.

  First, the operating pin 32 is formed of a steel material in a round bar shape or a circular tube shape, a male screw 32a is formed on one end side, and is screwed to the lower surface of the movable side mold plate 12, that is, the surface opposite to the movable side product surface 12a. It protrudes toward the ejector plate 14 side perpendicular to the lower surface of the movable side mold plate 12. The operating pin 32 passes through the insertion hole 14a provided on the other end side through the ejector plate 14, and the tip 32b is located near the lower surface of the lower ejector plate 16 in the mold closed state shown in FIG. When the molded product W is protruded, it is formed to have a full length protruding from the lower surface of the lower ejector plate 16 by a predetermined length. A square hole 32c having a hexagonal cross section is formed in the tip 32b of the actuation pin 32 in the axial direction. By inserting a hexagon wrench into the square hole 32c from below and turning, the actuation pin 32 is moved to the movable side template. 12 can be removed from the lower surface. The inner diameter of the insertion hole 14a of the ejector plate 14 is formed slightly larger than the outer diameter of the operating pin 32 so that the operating pin 32 can be loosely inserted in the axial direction. In the present embodiment, the operation pins 32 are attached to the left and right two locations corresponding to the installation locations of the protrusion pins 33 and the protrusion pin operation units 41.

  Next, the projecting pins 33 are attached to one or more locations arbitrarily selected from the installation setting locations of the plurality of ejector pins 20, and in the present embodiment, in the molded product W, the left and right locations are lower when molding. It is provided at the corresponding position. The projecting pins 33 have a function of projecting the molded product W in the same manner as the general ejector pins 20 fixed to the ejector plate 14. The projecting pins 33 are inserted into sleeve pins 34 that penetrate the interior of the movable side template 12. ing. The tip of the projecting pin 33 coincides with the surface of the movable product surface 12a during injection molding, and the rear end is attached to the ejector plate 14 via a retreating spring 35 so as to advance and retract in the axial direction. As shown in FIG. 1, the retraction spring 35 is disposed between the flange 33 a at the rear end of the projecting pin 33 and the collar 34 a at the lower end of the sleeve pin 34, and the projecting pin 33 is always attached to the movable side mounting plate 13. Energized to the side.

  The protruding pin operating unit 41 is attached to the lower surface of the lower ejector plate 16. The lower movable side mounting plate 13 is provided with a relief hole 13b in order to prevent interference with the protruding pin operating unit 41. As shown in FIGS. 4 to 6, the protruding pin operating unit 41 includes a base 42 made of a rectangular parallelepiped steel material, and is accommodated inside the base 42, and can swing around a support shaft 44, that is, both ends are opposite to each other. An arm member 43 that is pivotably attached to the base member 42, and a detector that is also housed in the base body 42 and detects that the protruding pin 33 returns to the position before protruding through the retreating spring 35 after protruding the molded product W. As a limit switch 46. More specifically, the base body 42 is provided with a through hole 42a having a square cross section in the horizontal direction at the center in the width direction, the arm member 43 and the limit switch 46 are accommodated therein, and an operating pin on one end side. An insertion hole 42b through which 32 is inserted penetrates in the vertical direction, and a substantially square-shaped square hole 42c into which the protruding pin 33, the retraction spring 35 and a part of the arm member 43 are inserted is provided on the upper surface on the other end side. ing. Support shafts 44 made of knock pins are fixed and installed on both side walls of the base body 42 in the horizontal direction, and the support shafts 44 are inserted perpendicularly to through holes provided in the arm member 43. Thus, the arm member 43 can be turned left and right about the support shaft 44. A set screw pin 45 is screwed to both ends of the support shaft 44, and both sides of the through hole of the base 42 are closed to prevent the support shaft 44 from coming off the base 42. 5 shows a state before the operation of the protruding pin operation unit 41, and FIG. 6 shows a state after the operation.

  As shown in FIGS. 1 and 3, the arm member 43 is configured such that the tip end 32 b of the operating pin 32 can be brought into contact with one end 43 a and the other end 43 b is in contact with the rear end of the protruding pin 33. When the operation pin 32 abuts against and presses the one end 43a, the other end 43b is reversed to push the protruding pin 33 toward the fixed product surface 2a. Here, as shown in FIGS. 5 and 6, the contact surface 43 c as a contact portion with the operation pin 32 at the one end 43 a of the arm member 43 is inward along the shape of the peripheral wall surface of the operation pin 32. The curved surface is recessed. As a result, one end 43a of the arm member 43 comes into surface contact with the operating pin 32, and the operating pin 32 concentrates on only a part of the arm member 43 and comes into contact with and slides on the contact surface 43c. It is preventing. As shown in FIG. 2, the contact portion 43 d of the other end 43 b of the arm member 43 with the protruding pin 33 is formed with a narrow width, and the arm member 43 is formed on the bottom surface of the flange portion 33 a of the protruding pin 33. The groove 33b is formed to have substantially the same width as the contact portion 43d of the arm member 43, and the contact portion 43d of the other end 43b of the arm member 43 is inserted into the groove 33b of the protrusion pin 33. 33 is pressed from below and moved up and down. As a result, the protruding pin 33 is prevented from rotating around the axis, and the tip end surface is always held at a fixed position that matches the shape of the movable product surface 12a and is stably pushed out along the axis. .

  Further, the arm member 43 is set so that the penetrating position of the support shaft 44 is close to one end 43 a that contacts the operating pin 32, and the distance from the support pin 44 to the contact portion 43 d of the projecting pin 33 is the support. It is set to be larger than the distance to the contact surface 43 c as the contact portion of the operating pin 32 around the shaft 44. This is because, as will be described later, only the protruding pin 33 is moved relative to the ejector plate 14 by amplifying and converting the moving amount of the protruding pin 33 larger than the moving amount of the operating pin 32.

As shown in FIG. 7, the limit switch 46 includes a push pin 46 a that moves forward and backward by contact with the arm member 43, and forms a return signal when the arm member 43 moves backward and contacts and presses the push pin 46 a. To the control panel of the machine.
As shown in FIG. 4, through holes 42d through which mounting bolts (not shown) are inserted are provided at four corners of the base body 42, and insertion holes 47 are provided at two places on both sides. Although not shown, the protruding pin operating unit 41 is positioned by fitting the insertion hole 47 into a positioning knock pin provided in the ejector plate 14 and then inserting a mounting bolt into the through hole 42d. The mounting bolt is inserted into the ejector plate. By being screwed into a bolt hole provided in 14, it can be easily attached to the ejector plate 14. Further, the projecting pin operating unit 41 can be easily detached from the ejector plate 14 by removing the mounting bolt at the time of disassembly and repair, replacement, or removal.

Here, the relationship between the movement amount of the operating pin 32 and the movement amount of the protruding pin 33 will be described with reference to FIG.
In FIG. 7, when the operating pin 32 is pushed down as indicated by a two-dot chain line and the tip 32b moves from the point P1 to the point P2, the arm member 43 rotates about the center O of the support shaft 44 and the other end 43b. The other end 43d moves from point P3 to point P4. The triangles O · P1 · P2 and the triangles O · P3 · P4 are similar. Therefore, the ratio of the distance from O to P1 and the distance from O to P3 is based on the stroke L1 from P1 to P2, which is the movement amount of the operating pin 32, and P3, which is the movement amount of the other end 43b of the arm member 43. Equal to the ratio of P4 to stroke L2. Here, since the distance from O to P3 is larger than the distance from O to P1, the stroke L2 of the other end 43b of the arm member 43 is larger than the stroke L1 of the operating pin 32 in proportion to the distance ratio. As a result, the movement amount of the other end 43b of the arm member 43 is amplified and converted with respect to the movement amount of the operating pin 32 via the arm member 43. Accordingly, the protruding pin 33 is also connected to the other end 43b of the arm member 43. The push-up movement amount is amplified by the same stroke.

Next, taking out of the molded product W using the protruding pin extrusion device 31 of the present embodiment configured as described above will be described with reference to FIGS. 8 and 9.
First, at the time of injection molding, the mold is in a closed state as shown in FIG. 8, and the ejector plate 14 is retracted to the movable side mounting plate 13 side. Accordingly, the distal end surfaces of the projecting pin 33 and the ejector pin 20 are in a position that coincides with the movable product surface 12a of the movable mold plate 12, and the distal end of the operating pin 32 is one end of the arm member 43 of the projecting pin operating unit 41. It is spaced a predetermined distance from 43a.

  Next, high-temperature molten resin is filled in a high pressure between the fixed product surface 2a and the movable product surface 12a in the mold closed state, and is cooled and solidified by holding the mold for a predetermined time to form a molded product W. Then, the movable mold 11 starts to be opened by the mold opening mechanism of the molding machine and is separated from the fixed mold 1. When the mold is opened, the ejector rod 21 starts to move forward and starts to push the ejector plate 14 forward. As a result, the ejector plate 14 is pushed forward against the biasing force of the retreating spring 19 of the return pin 18, and the ejector pin 20, the projecting pin 33 and the sleeve pin 34 are moved forward, and the tip is movable. It protrudes from the surface 12a and begins to press the molded product W from the back side. At this time, the operating pin 32 moves in the opposite direction relative to the ejector plate 14. However, at this time, the tip 32b of the operating pin 32 and the one end 43a of the arm member 43 are separated from each other, and the arm member 43 does not operate until the tip 32b of the operating pin 32 contacts.

  Then, when the ejector plate 14 further advances and the tip 32b of the operating pin 32 comes into contact with the contact surface 43c of the one end 43a of the arm member 43 and starts pressing, the arm member 43 rotates around the support shaft 44 as an axis. As a result, the other end 43b reversely moves and begins to push the protruding pin 33 in the same direction as the other ejector pins 20 against the urging force of the retracting spring 35. As a result, the protruding pin 33 moves relatively in the sleeve pin 34 and moves relative to the ejector plate 14 toward the fixed-side product surface 2a, and therefore, when the operating pin 32 starts to press the arm member 43. Then, in conjunction with the movement of the ejector plate 14, it is accelerated by the relative movement relative to the ejector plate 14 according to the amplification factor of the arm member 43, and moves forward at a speed faster than the other ejector pins 20 and sleeve pins 34. Further, the protruding pin 33 protrudes from the movable product surface 12 a longer than the other ejector plates 14 and the sleeve pin 34 by the amount of relative movement with respect to the ejector plate 14. That is, when the ejector plate 14 is pushed out, the same number of sleeve pins 34 as the plurality of ejector pins 20 and the projecting pins 33 start projecting all at once, and the projecting pins 33 precede and reach the sleeve pins. Thus, the molded product W is projected from the front end opening of 34.

  As a result, as shown in FIG. 9, the molded product W is vigorously protruded at the lower side where the protruding pin 33 abuts, so that the appearance-oriented surface on the right side in FIG. 9 is inclined slightly upward. Then, it falls on a fixed trajectory and is placed on a molded product receiver or tray that protrudes below the mold with the appearance-oriented surface up. At this time, the projecting pins 33 come into contact with and protrude from the left and right two places of the lower part of the molded product W, so that the molded product W falls in a constant posture in which the left and right are balanced. Thereby, the molded article W after taking out is not damaged. Almost simultaneously with the drop of the molded product W, the ejector plate 14 reaches the forward limit, the ejector pin 20 and the sleeve pin 34 stop protruding, and the abutting surface 43c of the one end 43a of the arm member 43 is formed as shown in FIG. The projecting pin 33 is held in a projecting state by pressing the peripheral wall surface of the operating pin 32.

  When the molded product W is ejected and is naturally dropped and taken out, the ejector plate 14 moves to the movable mounting plate 13 side by the urging force of the reverse spring 19 provided on the return pin 18. Along with this, the ejector pin 20 and the sleeve pin 34 also move backward. At the same time, the protruding pin operating unit 41 attached to the ejector plate 14 also moves backward and moves away from the operating pin 32, and the protruding pin 33 is moved backward by the urging force of the retracting spring 35. As a result, the arm member 43 is inverted with respect to the support shaft 44 while the other end 43b is pushed down by the rear end of the projecting pin 33 and the one end 43a is in contact with the front end 32b of the operating pin 32. Turn upward. The ejector plate 14 and the projecting pin 33 are completely retracted by both the ejector plate return confirmation switch (not shown) mounted on the movable mounting plate 13 and the limit switch 46 of the projecting pin operating unit 41 by the arm member 43. When this is detected and a backward return signal is sent to a control panel (not shown), mold closing for the next molding is started.

Next, the operation of the protruding pin extrusion device 31 of this embodiment will be described.
The protrusion pin operating unit 41 of the protrusion pin pushing device 31 is such that the distance from the support shaft 44 of the arm member 43 to the contact portion 43d with the protrusion pin 33 at the other end 43b is the same as the operation pin 32 at the one end 43a. Since the distance to the contact surface 43c is larger than the distance of movement of the operating pin 32, that is, the amount of movement of the protruding pin 33 due to the pressing of the arm member 43, the amount of movement of the operating pin 32 is larger. The pin 33 moves relative to the ejector plate 14 toward the fixed product surface 2a. Accordingly, the tip 32b of the operating pin 32 abuts against the abutting surface 43c of the one end 43a of the arm member 43 while the ejector plate 14 is projecting forward, and when the pressing starts, the projecting pin 33 fixes the inside of the outer sleeve pin 34. It moves to the side product surface 2a side and protrudes from the tip opening of the sleeve pin 34. As a result, the protruding pin 33 is initially moved at the same speed as the sleeve pin 34 and the other ejector pins 20, but is accelerated halfway and is ejected vigorously at a higher speed than the sleeve pin 34 and the ejector pins 20. At the same time, the amount of protrusion from the movable product surface 12a is also larger than the sleeve pin 34 and the other ejector pins 20, so that the molded product W is urged from the movable template 12 in a constant posture slightly inclined at a predetermined angle. It can be released and fall down to a certain place by drawing a predetermined trajectory. Here, since the protruding pins 33 are provided in a pair corresponding to the left and right two positions below the molded product W, the molded product W can be dropped in a fixed posture with balanced left and right. Therefore, in conjunction with the movement of the ejector plate 14, the molded product W can be always dropped in a fixed position in a fixed posture without being scattered around the periphery, so that the appearance surface can be prevented from being damaged by contact or the like. Since the appearance-oriented molded product W can be taken out by natural dropping, the molding cycle time is shortened compared to the case of a push-up by an unloader or an air cylinder.

  In addition, in the protruding pin operating unit 41, the ejector plate 14 starts moving forward by changing the length of the operating pin 32 and adjusting the distance between the one end 43a of the arm member 43 and the tip 32b of the operating pin 32. It is possible to easily adjust and change the optimum time and timing until the protruding pin 33 starts to move relative to the ejector plate 14. Then, by changing the ratio of the distance from the support shaft 44 to the one end 43a of the arm member 43 and the distance from the support shaft 44 to the other end 43b, the projection pin 33 is moved relative to the movement amount of the operating pin 32, that is, the ejector plate 14. By changing the amplification factor of the movement amount, the acceleration and the protrusion amount of the protruding pin 33 can be made to be optimum values, and the molded product W can be dropped in an arbitrary posture and in an arbitrary locus.

Further, since the protruding pin extrusion device 31 is housed in the movable mold 11, it is reliably prevented from being deformed or damaged by contact with an external object or peripheral devices, and is safe. It is protected in the movable mold 11.
And since the protrusion pin operation | movement unit 41 is comprised by the arm member 43 grade | etc., While being able to form compactly with a simple structure, the protrusion pin extrusion apparatus 31 uses a spread product as the operation pin 32 or the protrusion pin 33. Can also be manufactured at low cost.
Furthermore, since the protruding pin extrusion device 31 operates in conjunction with the movement of the ejector plate 14, no power source is required.
In addition, since the protruding pin extrusion device 31 is simply configured by the arm member 43 that operates mechanically, it always operates stably.
Further, since a square hole 32c having a hexagonal cross section is formed in the axial direction at the tip 32b of the operating pin 32, it is movable without removing the protruding pin operating unit 41, the movable side mounting plate 13, the ejector plate 14 and the like at all. The tip of the hexagon wrench is inserted into the square hole 32c of the operating pin 32 through the insertion hole 42b of the base body 42 of the projecting pin operating unit 41 from the outside of the side mounting plate 13, that is, the lower side. It can be easily removed from the lower surface of the template 12.

  Furthermore, the protrusion pin extrusion device 31 and the protrusion pin operating unit 41 can be attached to the ejector plate 14 from the outside through the relief holes 13b provided in the movable side attachment plate 13, and can be easily performed externally. it can. Moreover, when removing for inspection, repair, renewal, etc., it is also possible to carry out easily from the outside of the escape hole 13b of the movable side mounting plate 13 or the like. Accordingly, the movable side mold 11 can be attached and removed in a short time without greatly disassembling. Then, by simply removing the operating pin 32 by inserting the tip of the hexagon wrench into the square hole 32c of the tip 32b and turning as described above, the molded product W can be taken out by protruding only the conventional ejector pin. It can also be performed, and can be easily switched to the conventional movable mold 11. Therefore, the movable side mold 11 according to the present invention and the conventional movable side mold 11 can be arbitrarily selected according to the molded product W, and can be easily switched and used.

Since the projecting pin 33 can be attached to a place arbitrarily selected from the attachment setting places of the plurality of ejector pins 20, the sleeve pin 34 and the projecting pin 33 can be easily used by using the through hole of the ejector pin 20. Can be attached to the ejector plate 14, and the molded product W can be dropped in an optimal protruding state.
In addition, since the limit switch 46 for detecting that the protruding pin 33 has returned to the position before the protrusion is provided, the mold or the protruding pin is not moved by the next mold closing without the protruding pin 33 being completely returned. It is possible to reliably prevent 33 from being damaged.

  By the way, in the said embodiment, although the protrusion pin 33 is provided in two right and left corresponding to the lower two places of the molded article W, when implementing this invention, it is not limited to this number and position. What is necessary is just to set suitably according to the shape of the molded article W, etc. For example, it may be provided corresponding to a total of four locations, two at each of the upper and lower portions of the molded product W. Further, the protruding timing, the protruding speed, the protruding amount, and the like may be different between the protruding pins 33.

  Furthermore, although the protruding pin 33 of the above embodiment is shown as being inserted through the sleeve pin 34, the invention is not limited to this, and a straight ejector pin without the sleeve pin 34 may be used. An ejector pin or the like may be used.

  Further, the arm member 43 of the above embodiment is provided with one through-hole, and the support shaft 44 is inserted into the through-hole. However, the arm member 43 can be configured so that the position where the support shaft 44 is inserted and installed can be changed. A plurality of through holes may be formed along the longitudinal direction. Thereby, the amplification factor of the movement amount of the protrusion pin 33 with respect to the movement amount of the operating pin 32 can be appropriately changed and adjusted by using one arm member 43.

  And although the limit switch 46 of the said embodiment is incorporated in the protrusion pin action | operation unit 41, it does not necessarily need to be incorporated in the protrusion pin action | operation unit 41, and may be installed in another location.

  In addition, the protruding pin extrusion device 31 of the above embodiment uses the arm member 43 to move the protruding pin 33 relative to the ejector plate 14, but is not limited to this, and other stroke conversions are possible. A mechanism may be used.

In addition, the operating pin 32 of the above embodiment is fixedly attached to the movable side mold plate 12, and an insertion hole 14 a is formed in the ejector plate 14 to be inserted therethrough. A notched recess may be formed and inserted through the recess. Furthermore, the operating pin 32 is fixed to the movable mold 12, but is not limited to this movable mold 12, and may be attached and fixed to other locations in the movable mold 11. For example, an operating pin 32 protrudes from the movable side mounting plate 13 on the opposite side of the ejector plate 14 toward the upper ejector plate 14, and a hook-like hook is integrally formed at the tip thereof so that the ejector plate 14 moves forward. When doing so, it is also possible that the hook at the distal end abuts against one end 43a of the arm member 43 and pushes it down.
In addition, although the operation pin 32 is formed in a round bar shape or a circular tube shape, it may be formed in a square bar shape or the like.

  And although the base | substrate 42 is formed with the rectangular parallelepiped steel material, it may form in a column shape, elliptical column shape, etc., and may form it with another aluminum material, a synthetic resin material, etc. Although the arm member 43 is built in, the arm member 43 and the limit switch 46 may be placed on a flat base plate and attached in an exposed state.

  In addition, in the said embodiment, although taking-out of the molded product W in an injection molding machine is shown, the protruding pin extrusion apparatus and protruding pin operation unit of this invention should be used for taking out the molded product in another metal mold | die. Is also possible.

It is sectional drawing which shows the protrusion pin extrusion apparatus of embodiment of this invention. It is a partially expanded sectional view of FIG. It is sectional drawing which shows the operation state of the protrusion pin extrusion apparatus of FIG. The protrusion pin action | operation unit of FIG. 1 is shown, (a) is a perspective view, (b) is a top view. 1 shows the protruding pin operating unit of FIG. 1, wherein (a) is a cross-sectional view taken along the line AA in FIG. 4 (b), and (b) is a cross-sectional view taken along the line BB in FIG. 3 shows the protruding pin operating unit of FIG. 3, in which (a) is a cross-sectional view similar to FIG. 5 (a), and (b) is a cross-sectional view taken along the line CC of FIG. It is explanatory drawing which shows the relationship between the movement amount of the action | operation pin in the protrusion pin action | operation unit of FIG. 1, and the movement amount of a protrusion pin. It is sectional drawing which shows the state immediately after shaping | molding of the metal mold | die which attached the protrusion pin extrusion apparatus of FIG. It is sectional drawing which shows the state which drops and takes out a molded article from the metal mold | die of FIG. It is sectional drawing which shows the state which drops and takes out a molded article from the metal mold | die provided with the conventional drop extraction mechanism.

Explanation of symbols

2a Fixed side product surface 11 Movable side mold 12 Movable side mold plate 14 Ejector plate 20 Ejector pin 31 Projection pin extrusion device 32 Actuation pin 33 Projection pin 35 Retraction spring 41 Projection pin operation unit 42 Base body 43 Arm member 43a One end 43b The other end 43c Contact surface 43d Contact portion 44 Support shaft 46 Limit switch W
Molding

Claims (5)

A projecting pin that is attached to the ejector plate via a retreating spring so as to be movable forward and backward in the axial direction, and projects a molded product,
An actuating pin disposed in a movable mold in parallel with the protruding pin and moving relative to the ejector plate in the axial direction;
A base attached to the ejector plate, and a base attached to the base so as to be swingable about a support shaft. When one end receives a pressing operation of the operating pin by the relative movement, the other end is reversed and the protruding pin is A projecting pin actuating unit comprising an arm member that pushes in the direction of the fixed side mold,
The arm member has a protrusion in which a distance from the support shaft to a contact portion with the protruding pin at the other end is larger than a distance from the support shaft to a contact portion with the operation pin at the one end. Pin extrusion device.   2. The protruding pin extrusion device according to claim 1, wherein the protruding pin is attached at one or more locations arbitrarily selected from mounting setting locations of a plurality of ejector pins attached to the ejector plate.   3. The detector according to claim 1, further comprising a detector configured to detect that the protruding pin is retracted via the retreating spring and returned to a position before the ejection after the molded product is ejected. Protruding pin extrusion device. By pressing the operating pin that is attached to the ejector plate and moves relative to the ejector plate in the axial direction, the protruding pin that moves forward and backward in the axial direction via the retreating spring to project the molded product is pushed in the direction of the fixed mold. A projecting pin actuating unit that
A base body attached to the ejector plate;
The base is pivotably mounted about a support shaft. When one end receives the pressing operation of the operating pin by the relative movement, the other end is reversed to push the protruding pin toward the fixed mold. An arm member,
The arm member has a protrusion in which a distance from the support shaft to a contact portion with the protruding pin at the other end is larger than a distance from the support shaft to a contact portion with the operation pin at the one end. Pin actuation unit.   5. The protruding pin operating unit according to claim 4, further comprising a detector that detects that the protruding pin has been retracted through the retracting spring and returned to the position before the protruding after the molded product has been protruded. .

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