JPH0744463U - Cassette type injection mold equipment - Google Patents

Abstract

(57) [Summary] [Structure] The cassette mold 17 is inserted into and removed from the movable mold Q, and the first projecting pin 17e in the cassette mold is displaceable to a position where it projects and retracts from the cavity surface. , The first return spring biases the first projecting pin in the backward direction, and the rear end portion of the first projecting pin is the first projecting plate 1.
It is fixed to 7c and 17d, and the retracted position of this first projecting plate is regulated by the receiving plate 17h. The second projecting pin 19c provided on the movable side mold Q is the first projecting plate 1
7c, 17d to press the first protruding pin 17e
Is displaced to a position projecting from the cavity surface against the biasing force of the return spring, and is retracted from the pressing position of the first projecting plates 17c and 17d, and the second return spring retracts the second projecting pin. It is urged toward. [Effect] The protruding position can be designed to be an optimum position, and the first and second protruding pins can be prevented from being damaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cassette-type injection molding die device.

[0002]

[Prior art]

 A cassette type mold device used in an injection molding machine incorporates a small cassette mold into a base mold. As a result, the base mold can be shared and only the small cassette mold can be replaced to accommodate various product shapes, and the mold manufacturing cost can be reduced.

By the way, when it is difficult to take out the molded product from the cavity, a molded product ejecting mechanism is provided, but conventionally, the molded product ejecting mechanism has one protruding pin penetrating from the base mold to the cassette mold. Is provided and the protrusion pin is moved to the cavity side (eg, Japanese Utility Model Publication No. 58-42100), or the protrusion plate and the protrusion pin to which the protrusion plate is fixed are provided on the cassette mold, and The base die has a protruding pin that can press the protruding plate on the cassette mold side, and the protruding pin on the base mold side is moved to the cassette mold side to move the protruding pin on the cassette mold side through the protruding plate into the cavity. It was carried out by moving it to the side (JP-A-57-152908, JP-A-57-165356).

[0004]

[Problems to be solved by the device]

 However, in the former structure, the position where the projecting pin is provided cannot be changed, and the projecting must always be performed at that position, and the projecting position is inappropriate depending on the shape of the cavity of the cassette mold. The protrusion was insufficient, and the molded product was scratched. Also, when trying to make the protruding position the best position, it was necessary to remake the base mold, which was contrary to the intention of reducing the mold manufacturing cost.

Further, in the latter structure, when the cassette mold is detached during replacement of the cassette mold, the projecting pin on the base mold side is restricted by the impact at the time when the cassette mold is removed. The protrusion plate on the cassette mold side may collide with the protrusion pin on the base mold side when the cassette mold is inserted into the base mold after that. There is a problem that the side protruding pin is damaged.

Therefore, an object of the present invention is to reduce the die manufacturing cost, obtain the best protruding position, and prevent the protruding mechanism from being damaged when the cassette mold is replaced. A type injection molding die device is provided.

[0007]

[Means for Solving the Problems]

 A feature of the present invention is that it has a movable mold and a cassette mold that is inserted into and removed from the movable mold, and the cassette mold has an advance position protruding from the cavity surface and a cavity surface. A first projecting pin displaceably provided in a retracted retracted position, a first return spring for biasing the first projecting pin in a direction retracting from the cavity surface, and a rear end portion of the first projecting pin A first projecting plate fixed to the base plate and a receiving plate that regulates the retracted position of the first projecting plate are built in. The movable side mold presses the first projecting plate. And the second protruding pin that displaces the first protruding pin against the biasing force of the first return spring to the advanced position and retracts from the pressing position of the first protruding plate, and the second protruding pin. The second return that urges the protruding pin to retract Door is in a place that is built.

Another feature of the present invention is that the movable mold has a built-in sensor for detecting the backward / backward position of the first protruding pin.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, the mold is composed of a fixed mold P and a movable mold Q. First, the structure of the fixed mold P will be described. A nozzle bush 2 having a sprue 2a is attached to a fixed side mounting plate 1 via a locating ring 3. A nozzle (not shown) of an injection molding machine is fitted into the nozzle bush 2. Further, four support shafts 10 are fixed to the fixed side mounting plate 1 (see FIG. 2). A runner lock pin 32 is attached to the mounting plate 1 on the fixed side, the tip of which extends to a runner 8a, which will be described later, and the tip is undercut. The spacer plate 5 is fixed to the receiving plate 4, and has a recess 5a into which a runner plate 6 described later can be inserted.

The fixed-side base plate 7 is slidably supported by the support shaft 10 and arranged on the right side of the spacer plate 5 in FIG. As shown in FIG. 2, the base plate 7 on the fixed side has a total of four cassette mold insertion recesses 7b in two rows in the vertical direction and two rows in the horizontal direction at a predetermined interval with the same rectangular cross section. It is opened in shape. For the sake of explanation, the upper left cassette mold insertion concave portion in FIG. Positioning pins 21 are attached to the base plate 7 on the fixed side at the upper left and lower right of FIG. 2 of each cassette mold insertion recess 7b. The positioning pin 21 is loosely fitted in the base plate 7 so as to be retractable and retractable, and its rear side is pressed by a pressing spring 29 as shown in FIG. The tip 21a of the positioning pin 21 is tapered. The positioning pin 21 is fitted to the front flange portion 8d of the fixed-side cassette mold 8 to position the fixed-side cassette mold 8. Further, permanent magnets 22 are embedded in the base plate 7 on the fixed side at the upper right and lower left positions in FIG. 2 of each cassette mold insertion concave portion 7b. 8d (see FIG. 4).

On the back side of the fixed base plate 7, three key grooves 7a having a substantially rectangular cross section are formed vertically in the plane direction. For the sake of explanation, let us say that the left key groove in FIG. 2 is 7a1, and the middle one is 7a2 and 7a3, respectively. As shown in FIGS. 1 and 2, each key groove 7a is formed so as to partially overlap the upper and lower cassette mold insertion recesses 7b, and the key grooves 7a2 therein are all cassette mold insertion recesses. It overlaps with 7b. At the overlapping portion 7c, the fixed key 9 locks the rear flange portion 8e of the cassette mold 8 as described later. Four guide shafts 11 are fixed to the fixed base plate 7 for guiding the movable base plate 16. Further, spacers 12 are fixed to the upper and lower ends of the fixed side base plate 7, respectively. When the mold is clamped, the spacers 12 come into contact with the movable side base plate 16 so that the cassette mold 8 and the movable side mold 12 are moved. It is designed so that no unreasonable force is generated between it and the cassette mold 17 of. Further, the fixed side base plate 7 is connected to the movable side mold Q via a limiting bolt (not shown), and when the movable side mold moves with respect to the fixed side mold P by a predetermined amount or more, the limit bolt is moved. Via the movable mold Q, it moves so as to separate from the spacer plate 5.

The runner plate 6 is fixed to the back side of the fixed base plate 7. As shown in FIG. 2, the runner plate 6 is fixed to the central portion on the back side of the fixed base plate 7 and overlaps all of the four cassette mold insertion recesses 7b. The runner plate 6 is as shown in FIG. 3 when viewed from the left side of FIG. 1. Vertical runners 6b having a predetermined length in the vertical direction and horizontal runners 6a, 6a extending laterally from their ends are engraved. is there. The thickness of the runner plate 6 is substantially equal to the thickness of the spacer plate 5. The runner plate 6 is fixed to the fixed base plate 7 by screwing it in the mounting holes 6c. When the molten material is sent from the sprue 2a provided at the central position to the gate 8c, a runner plate 6 that overlaps with the cassette mold insertion concave portion 7b is provided, and the molten material is caused to flow on the runner plate 6. Therefore, the runner plate 6 overlaps the cassette mold 8 and the molten material is prevented from entering the clearance between the cassette mold insertion recess 7b and the cassette mold 8.

The fixed-side cassette mold 8 has a front flange 8d and a rear flange 8e. As shown in FIG. 1, the front flange 8d is locked to the front surface of the fixed-side base plate 7. Then, the rear flange portion 8e is fixed to the base plate 7 by being locked by the fixed key 9 inserted in the key groove 7a. For the sake of explanation, the cassette molds 8 inserted into and removed from the cassette mold insertion recesses 7b1, 7b2, 7b3, 7b4 are referred to as 81, 82, 83, 84, respectively. The front flange portion 8d is also formed in the vertical direction as shown in FIG. 4, and is positioned at a position facing the positioning pin 21 when the fixed-side cassette mold 8 is incorporated into the fixed-side base plate 7. A hole 8f is formed. A cavity 8b is formed on the front surface of the fixed-side cassette mold 8 and is combined with the cavity 17a of the movable-side cassette mold 17 to form the shape of the molded product. A runner 8a is formed on the back surface of the fixed-side cassette mold 8 and three runners 8g are formed from the end of the runner 8a toward the front surface of the fixed-side cassette mold 8. (See FIG. 2), and its tip is a gate 8c.

Next, the fixed-side fixed key 9 will be described. The fixed key 9 has three keys 91, 92, 93 which are respectively inserted into the key grooves 7a1, 7a2, 7a3, and are integrated by connecting members 9g at the upper end as shown in FIG. , Has a comb-like shape. As shown in FIG. 1, the keys 91, 92, 93 have a collar portion formed on the side where the cassette die 8 is locked, and the rear portion 8e of the cassette die 8 on the fixed side is formed by this collar portion. It is designed to be locked. Further, on the keys 91, 92, 93, notches 9a, which are slightly longer than the vertical length of the cassette molds 81, 82, are provided at the same height position on the side where the molds 8 are locked, as shown in FIG. Has been formed. The width of the cutout 9a is such that when the cutout 9a reaches the position of the cassette mold 81, 82, the locking between the rear flange 8e and the keys 91, 92, 93 is released. Next, the length of the portion of the keys 91, 92, 93 that locks the cassette molds 83, 84 on the line end side is determined by the clearance between the upper and lower cassette molds 81 and 83, and It is shorter than the clearance gap between the upper and lower cassette molds 82 and 84. Therefore, when the fixed key 9 is moved to a certain length, the portion where the cassette molds 83 and 84 are locked is the clearance between the upper and lower cassette molds 81 and 83, and the upper and lower cassette molds 82. And the notch 9a moves to the positions of the cassette molds 81, 82, so that the cassette molds 81, 82, 83, 84 are locked with the keys 91, 92, 93. Is released.

Next, the structure of the movable die Q will be described. In FIG. 1, the movable side mounting plate 13 is mounted on a movable member (not shown) of an injection molding machine (not shown), and is movable back and forth in the direction of the fixed side mold P.

A spacer block 14, a receiving plate 15, and a movable base plate 16 are fixed to the movable mounting plate 13.

Similar to the base plate 7 of the fixed side mold P, the movable side base plate 16 is formed with four cassette mold insertion concave portions 16 b in the thickness direction, and the movable side base plate 16 is Two positioning pins are attached (not shown) at diagonal positions above and below each cassette mold insertion concave portion 16b, and the structure thereof is similar to that of the positioning pin 21 of the fixed-side mold P. Further, similarly to the fixed-side mold P, permanent magnets are embedded in positions above and below the respective cassette mold insertion recesses 16b in positions diagonally opposite to the above-described position-measuring pins (not shown).

Similar to the fixed side, three key grooves 16a having a substantially rectangular cross section are formed vertically on the back surface side of the movable side base plate 16 in the plane direction.

The movable-side cassette mold 17 is configured by fixing a bottom plate 17g, a receiving plate 17h, a spacer plate 17f, a first mold plate 17i, and a second mold plate 17j in this order. As shown in FIG. 1, the bottom plate 17g is elongated in the left-right direction with respect to the receiving plate 17h, and this portion serves as a rear brim portion, and the second template 17j is left and right more than the bottom plate 17g. Also, it becomes longer in the up-down direction, and this portion is the front brim portion. In addition, a positioning hole is formed in the front collar portion at a position facing the positioning pin (not shown). A cavity 17a is formed on the front surface of the second template 17j, and a core pin 17b is attached.

A first molded product ejection mechanism is provided in the movable cassette die 17. The first molded product ejecting mechanism stores the first ejecting plates 17c and 17d and the first ejecting pin 17e fixed thereto in the space formed inside the spacer plate 17f, and the first ejecting pin is inserted into the space. It has a structure in which it is slidably fitted in a through hole connecting this space and the cavity 17a, and can be displaced to an advancing position projecting from this cavity surface and a retracting position from this cavity surface. Further, in the inner space of the spacer plate 17f, a first return spring, which is a compression spring, is provided between the first projecting plate 17d and the first mold plate 17i (not shown). The pin 17e and the rear end portion of the protruding pin of the pin 17e are urged in the direction of retracting the first projecting plates 17c, 17d to which the fixed ends are fixed, and particularly the first projecting pin 17e is retracted from the cavity 17a surface. Urged in the direction. The retracted positions of the first protruding plates 17c and 17d are restricted by the receiving plate 17h. Further, the bottom plate 17g and the receiving plate 17h are provided with through holes 17k at positions facing the first protruding plate 17c. The forward drive of the first projecting pin 17e is performed by the second projecting pin 19e of the second projecting mechanism, which will be described later, pressing the projecting plate 17c through the through hole 17k. As described above, since the first projecting mechanism is independent by itself, it is possible to provide the first projecting pin 17e at an optimum position according to the shape of the cavity 17a. As shown in FIG. 5, the sensor pins 33 are fixed to the first projecting plates 17c and 17d in a rearward direction, and their tips pass through through holes formed in both the receiving plate 17h and the bottom plate 17g. Corresponding to the detection sensor 26 including a proximity switch provided on the receiving plate 15. When the protrusion plates 17c and 17d retract, the tip of the sensor pin 33 approaches the detection sensor 26, and the retracted position of the first protrusion pin 17e is detected. Therefore, as will be described later, it is possible to prevent damage caused by the protrusion of the first protruding pin 17e.

Like the fixed key 9 of the fixed-side die P, the movable-side fixed key 18 also has a comb-like shape (not shown) in which three fixed keys are connected at the upper end to be integrated. A collar portion is formed on the side of the fixed key 18 where the cassette die 17 is locked, and the point where the rear collar portion of the cassette die 17 is locked by this collar portion. Similar to the fixed key 9 of the fixed-side mold P, a notch having a predetermined length and width is formed at a predetermined position on the locking side.

A second projecting mechanism is provided behind the cassette mold 17. The second projecting mechanism accommodates the second projecting plates 19c and 19d and the eight second projecting pins 19e fixed thereto in the space formed inside the spacer block 14, and the cassette mold 17 Through holes 15a corresponding to the through holes 17k of the above are opened in the receiving plate 15, and two of the eight protruding pins 19e are connected to the first protruding plate 17c provided in each cassette mold 17 so as to face each other. It has a structure in which it is loosely fitted in the holes 15a and 17k. Further, as shown in FIG. 5, the return pin 23 is fixed to the second projecting plates 19c and 19d, and between the second projecting plate 19d on the return pin 23 and the base plate 16. A second return spring 24 composed of a compression spring is provided so as to urge the second projecting pin 19e in the backward direction. The advancing of the second projecting pin 19e is performed by a projecting rod (not shown) entering through the through hole 13a pressing the projecting plate 19c.

Next, the operation will be described. Under the mold open state, the cassette mold 8 on the fixed side of the molded product to be manufactured is inserted into the cassette mold insertion recess 7b on the fixed side from the PL surface. Then, the positioning pin 21 is fitted into the positioning hole 8f on the front flange portion 8d of the fixed-side cassette mold 8 and the front flange portion 8d is attracted by the permanent magnet 22, so that the fixed-side cassette mold 8 is removed. It is prevented. Next, the comb-shaped fixed key 9 is inserted into the key groove 7a. Then, the flange portion of the fixed key 9 locks the rear flange portion 8e of the fixed-side cassette mold 8, and the fixed-side cassette mold 8 is fixed to the fixed-side base plate 7. Since all the keys 91, 92, 93 are connected, all the fixed-side cassette molds 8 can be fixed by one insertion operation. Similarly to the fixed-side cassette mold 8, the movable-side cassette mold 17 is also inserted into the movable-side cassette mold insertion recess 16b, and the comb-shaped fixed key 18 is inserted into the key groove 16a. The cassette mold 17 is fixed to the movable base plate 16. When inserting the cassette die 17 on the movable side into the cassette die insertion recess 16b, the second projecting pin 19e is inserted into the through hole 17k, but at the time of this insertion, the second projecting pin 19e is inserted into the first projecting pin 19e. The projecting plate 17c does not collide, and the second projecting pin 19e is prevented from being damaged. That is, since the second projecting pin 19e is biased in the backward direction by the second return spring 24, the second projecting pin 19e projects further forward than the backward limit position of the first projecting plate 17c. This prevents the second projecting pin 19e from colliding with the first projecting plate 17c and prevents the second projecting pin 19e from being damaged.

Then, the pellets charged from the hopper of the injection molding machine are advanced by the screw in the cylinder and heated, and the molten molding material is passed from the nozzle to the runners 6b and 6a of the runner plate 6 through the sprue 2a. Further, it flows into the cavities 8b and 17a from the gate 8c through the runners 8a and 8g of the fixed-side cassette die 8. At this time, the molten molding material does not flow into the clearance between the cassette mold 8 and the cassette mold insertion recess 7b due to the overlap of the runner plate 6 with the cassette mold 8.

When the molding material in the cavities 8b and 17a is hardened, the PL surface is opened by a predetermined amount. Then, the molding material is separated at the gate 8c, and the molding remains on the cavity 17a side. On the other hand, when the PL surface is opened, a projecting rod (not shown) enters through the through hole 13a and is pressed by the projecting rod and the second projecting plates 19c and 19d of the second projecting mechanism and the second projecting plate 19c. The protruding pin 19e advances. Then, the second projecting pin 19e presses the projecting plates 17c and 17d of the first projecting mechanism and the first projecting pin 17e to move forward against the urging force of the first return spring to move the cavity 17a. Stick out the molded product inside.

After the molded product is ejected, the PL surface is further opened by a predetermined amount. Then, the base plate 7 on the fixed side separates from the spacer plate 5, and by this operation, the undercut portion at the tip of the runner lock pin 32 is pulled from the molding material solidified in the runner portion, and the molding material of the solidified runner portion is removed. It falls naturally and is removed.

After that, when the same molded product is to be produced, the mold is clamped, but before that, it is confirmed by the retreat detection sensor 26 that the first projecting pin 17e of the first projecting mechanism is retracted. . That is, when the mold is clamped, the projecting rod (not shown) retreats from the through hole 13a by this operation, and along with this, the second projecting plates 19c, 19d and the second projecting plate of the second projecting mechanism. The pin 19e is retracted by the urging force of the return spring 24, and following this, the protrusion plates 17c and 17d of the first protrusion mechanism and the first protrusion pin 17e serve as a first return spring (not shown). It is retracted to a predetermined position by the urging force. Therefore, since the first projecting pin 17e is returned to the original position, the first projecting pin 17e is prevented from colliding with the stationary-side cassette die 8 and being damaged. If the first projecting pin 17e does not retreat to a predetermined position and the mold is clamped as it is, the first projecting pin 17e collides with the fixed-side cassette mold 8, especially the fixed-side cassette mold 8 If a slide core or the like is provided on the above, there is a risk that the first protruding pin 17e may be damaged. However, since the detection sensor 26 confirms the retreat of the first protruding pin 17e, this risk can be avoided. After mold clamping, injection molding is performed in the same manner as above.

When the cassette die is replaced, the comb-teeth-shaped fixed key 9 is raised by a predetermined distance while the die is open. Then, the notch 9a is located in the upper cassette molds 81 and 82, and the portion of the fixed key 9 that locks the lower cassette molds 83 and 84 is located between the upper and lower cassette molds. , The cassette molds 81 to 84 are unlocked. However, the permanent magnet 22 causes the fixed-side cassette mold 8 to be attracted to the fixed-side base plate 7 and prevents the fixed-side cassette mold 8 from dropping. Then, the cassette mold 8 on the fixed side is removed from the PL surface side. Then, a new fixed-side cassette mold 8 is inserted into the cassette mold insertion recess 7b in the same manner as described above, and fixed with the fixing key 9. Also on the movable side, the cassette die 17 on the movable side is replaced by the same procedure as the fixed side. Since the cassette molds 8 and 17 can be exchanged with a slight slide of the fixed keys 9 and 18, the exchange work time can be shortened. Further, if the first projecting pin 17e is provided at an optimum position according to the shape of the cavity when the movable side cassette mold 17 is replaced, the design of the position of the second projecting pin 19e will not be changed. The molded product can be taken out by pressing the appropriate position of the molded product with a simple structure. Further, when the movable-side cassette mold 17 is replaced, the second protruding pin 19e is prevented from being damaged in the same manner as when the movable-side cassette mold 17 is inserted into the cassette-mold insertion recess 16b. .

After the cassette mold is replaced, injection molding is performed again in the same manner as above. Next, another embodiment of the positioning unit will be described. In FIG. 6, a conical hole 34 is formed in the surface portion of the base plate 7 on which the positioning pin 21 is provided so as to be retractable, and a conical hole 34 is formed so as to surround the positioning pin 21. In this state, it is installed so that it projects from the surface of the base plate 7 on the fixed side, is compressed when a force is applied, and is embedded in the hole 34. Therefore, the disc spring 27 can press the periphery of the positioning hole 8f of the fixed-side cassette die 8 fitted with the positioning pin 21 from the fixed-side base plate 7 side. Since oil adheres to the surfaces of the fixed-side cassette mold 8 and the fixed-side base plate 7 and a large adhesive force is generated between the two, it is difficult to remove the cassette mold 8 when replacing the fixed-side cassette mold 8. However, by providing the disc spring 27, the positioning pin 21 and the positioning hole 8f can be easily separated from each other, and the cassette mold 8 can be easily removed. Further, when the positioning pin 21 and the positioning hole 8f are provided at a plurality of places, the cassette mold 8 must be pulled out evenly with respect to the positioning pins 21 at a plurality of places, and the cassette mold 8 can be distorted and removed. However, since the disc spring 27 tries to push out the cassette mold 8 evenly from the positioning pin 21 side, the cassette molds 8 and 17 can be separated from each other without applying an excessive force. If the spring force of the disc spring 27 is made smaller than the attraction force of the permanent magnet 22, the cassette die 8 can be maintained in a state of being attracted to the surface of the fixed base plate 7. Further, the spring force of the disc spring 27 may be made larger than the attraction force of the permanent magnet 22. As a result, when the fixing key 9 is removed, the fixed-side cassette mold 8 is lifted from the surface of the fixed-side base plate 7 by the spring force of the disc spring 27 against the attractive force of the permanent magnet 22, and the cassette mold is replaced. Work becomes easier. Even if the fixed side cassette die 8 is lifted from the surface of the fixed side base plate 7 by the spring force of the disc spring 27, the fixed side cassette die 8 is fixed by the permanent magnet 22 to the fixed side base plate 7 side. Therefore, the cassette die 8 on the fixed side can be prevented from falling. In the above description, the case where the disc spring 27 is provided on the fixed side base plate 7 has been described, but it goes without saying that the disc spring 27 may be provided on the cassette mold 8 and the present embodiment can be applied to the movable side. Further, not only the disc spring 27 but also a compression spring or the like that produces a predetermined pressing force can be used as the one that causes the separating action.

In the present invention, the cassette mold is inserted / removed from the PL surface side, and the cassette mold is fixed by the fixing key that is inserted / removed in the surface direction of the base plate, so that the operation is simple and the robot etc. The automation used can be done very easily.

[0031]

[Effect of device]

 The cassette type injection molding die device according to the present invention has a movable side die and a cassette die that is inserted into and removed from the movable side die, and the cassette die is extended to protrude from the cavity surface. Position and a first protruding pin displaceably provided in a retracted position retracting from the cavity surface, a first return spring biasing the first protruding pin in a direction retracting from the cavity surface, and a first protruding pin A first projecting plate fixed to the rear end portion and a receiving plate that regulates the retracted position of the first projecting plate are built-in. The movable side mold presses the first projecting plate. A second protruding pin that displaces the first protruding pin against an urging force of the first return spring to an advanced position that protrudes from the cavity surface and retracts from the pressing position of the first protruding plate; Bias the second ejector pin in the backward direction Since it has a built-in second return spring, the projecting position of the first projecting pin can be designed in an optimum position when designing a cassette mold, which reduces the mold manufacturing cost and optimizes it. It is possible to achieve both the purpose of securing the proper protruding position, and since the first and second protruding pins are biased by the return spring in the direction of retracting independently, the fixed side at the time of mold clamping. Of the cassette die collides with the first projecting pin to damage the first projecting pin, or the first projecting plate collides with the second projecting pin when the cassette mold is replaced, etc. The protruding pin will not be damaged.

Further, if the movable die has a built-in sensor for detecting the retracted position of the first projecting pin, the sensor can confirm the retracting of the first projecting pin, and the first projecting pin at the time of mold clamping can be confirmed. Can be more reliably prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cassette-type injection molding die device cut at various positions.

FIG. 2 is a vertical sectional view taken along line AA of FIG.

FIG. 3 is a front view of a runner plate.

FIG. 4 is a vertical cross-sectional view showing the positioning of the cassette mold and a fall-out prevention mechanism.

FIG. 5 is a cross-sectional view showing a retracting mechanism for the second protruding pin and a detecting mechanism for detecting the retracted position of the first protruding pin.

FIG. 6 is a transverse cross-sectional view showing a mechanism for separating a positioning pin and a positioning hole in another embodiment.

[Explanation of symbols]

 Q Movable side mold 17 Movable side cassette mold 17a Cavities 17c, 17d First protruding plate 17e First protruding pin 17h Receiving plate 19e Second protruding pin 24 Second return spring 26 Detection sensor 33 Sensor pin

Claims (2)

[Scope of utility model registration request] 1. A movable-side mold, and a cassette mold that is inserted into and removed from the movable-side mold, wherein the cassette mold has an advancing position protruding from a cavity surface and a retracting position from the cavity surface. A first projecting pin displaceably provided in the retracted position, a first return spring for biasing the first projecting pin in a direction of retracting from the cavity surface, and fixed to a rear end portion of the first projecting pin. A first projecting plate and a receiving plate that regulates the retracted position of the first projecting plate are built in, and the movable die is pressed against the first projecting plate to create the first projecting plate. A second projecting pin that displaces the first projecting pin against the biasing force of the first return spring to the advanced position and recedes from the pressing position of the first projecting plate; and the second projecting pin. The second return spring that biases in the backward direction Cassette injection mold apparatus characterized by being. 2. The cassette type injection molding die apparatus according to claim 1, wherein the movable die has a built-in sensor for detecting a retracted position of the first protruding pin.