JPH0722949B2 - Device for taking out screws - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for taking out a threaded product, and more specifically, in a cavity, a threaded portion is formed at a tip end thereof for molding a threaded product. The present invention relates to a device for taking out a threaded product injection-molded by using a mold in which a core pin is arranged.

[Prior Art] Conventionally, when a product having an internal thread portion is produced by using an injection molding machine, a core pin having an external thread portion is placed in a cavity of a mold and a molding material is injected into the cavity to form the product. The mold was opened, the core pin was projected, and the threaded product formed at the tip of the core pin was manually rotated to remove it from the core pin.

Further, as another example, a screwed product may be removed by providing a mechanism for rotating the core pin in the mold, and mechanically rotating the core pin after opening the mold.

[Problem to be solved] Therefore, in the case of the former, in order to put a hand between the molds,
There is a danger in terms of heat or safety, and since a considerable amount of rotational force is required to rotate and remove it, work efficiency has been reduced.

Further, in the latter case, there is a problem that the mechanism of the core pin is rotated in the mold, the mechanism of the mold is complicated, and the rotation causes a clearance to deteriorate the accuracy of the product.

Therefore, an object of the present invention is to make it possible to take out a molded product with a screw safely and efficiently, and also to simplify the structure of a mold to improve the accuracy of the product.

[Means for Solving the Problem] A first invention of a device for taking out a product with a screw of the present invention includes a core pin having a threaded portion formed at a distal end thereof for molding a product with a screw, in a mold open state. A molding die device in which the core pin is projected while the threaded product is screwed on, and an abutment which faces the molding die device in the mold open state and engages with the threaded product screwed on the projected core pin Part on the front part, a fixed nut with which the screw shaft part provided on the rear part of the product extract plate engages, and the screw shaft part is relatively non-rotatable and axial. A drive shaft that fits in and out of the drive shaft, and drive means that rotationally drives this drive shaft, and a pawl rotatably supported at a position facing the contact portion on the product take-out board and a pawl. A spring that urges in one rotation direction and a claw engaging member that is fixed at a fixed position that can abut one end of the claw Even after the screwed product and the core pin are unscrewed, the screwed product is held between the abutting part and the claw urged by the force of the spring, and the product is taken out. By rotating the board in the reverse direction to bring the claw into contact with the claw engaging member, the claw is opened, and the holding of the screwed product on the product take-out board is released.

Furthermore, a second invention of the present invention is, in addition to the above-mentioned first invention, that the product take-out board has a circular outer peripheral surface, and a holder for externally fitting the circular outer peripheral surface to guide the movement of the product take-out board is provided. It is fixedly provided, and the pawl engaging member is provided on this holder.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a molding die apparatus 1 for molding a threaded product P is composed of a movable die 1a and a fixed die (not shown),
In order to form a screw of the threaded product P, a core pin 3 having a threaded portion 3a formed at its tip is provided in a cavity 2 formed in the movable mold 1a so as to be movable back and forth. With this molding die device 1, the threaded product P has already been molded in the previous step of FIG. 1, and the molding die device 1 of FIG.
Is the mold open state separated from the fixed mold, and the core pin 3
The threaded product P is still screwed on.

The take-out device B for taking out the threaded product P is moved to a position facing the molding die device 1 in the mold open state by means not shown. For example, a fixed mold (not shown) is fixedly installed on the right side of the device B, and the device B is waiting upward during injection molding, and the movable mold 1a moves to the right and contacts the fixed mold. , The threaded product P is molded.

Next, the take-out device B will be described. As shown in FIG. 1, from the drive means 10 such as a rotary actuator to the drive shaft 10a.
Is projected toward the molding die device 1, and the drive shaft
A key 11 is fixed to 10a.

On the front surface of the driving means 10 (the surface facing the molding die device 1),
A base plate 4 is fixed via a support plate 5. The nut 6 is fixed to the center hole 4a of the base plate 4,
The drive shaft 10a penetrates through the center hole 6a of the support plate 5 and the nut 6 and projects forward. The product take-out board 7 facing the molding die device 1 has a circular outer peripheral surface 7a, and a screw shaft portion 7b is projectingly provided on the back surface thereof, and the screw shaft portion 7b is screwed with the nut 6.
The pitch of the screw between the nut 6 and the screw shaft portion 7b depends on the core pin 3
The pitch is the same as the pitch of the threaded portion 3a, and these are threaded in the same direction. Along the axis of the product take-out board 7,
A central shaft hole 7c into which the drive shaft 10a fits is penetrated, and a key groove 7d into which the key 11 of the drive shaft 10a is slidably fitted is formed on the inner peripheral surface of the central shaft hole 7c. . This key 11 and keyway
By fitting with 7d, the product take-out board 7 is connected to the drive shaft 10a so as not to rotate and to move back and forth.

As shown in FIG. 2, the left contact portion is provided on the front surface of the product take-out board 7.
7e and the right side contact portion 7f are provided so as to project. The left side contact portion 7e and the right side contact portion 7f contact the side surface of the threaded product P to rotate the threaded product P, have a predetermined height, and are located at the center point of the product unloading board 7. They are provided at symmetrical positions.

Further, on the front surface of the product take-out board 7, a claw 8 is rotatably supported by a shaft 7g projecting from the product take-out board 7 at a position on the upper left side facing the right contact portion 7f. This claw 8 is a spring 9
Is urged to rotate in one rotation direction, that is, clockwise in FIG. As will be described later, one end 8a of the claw 8 is an end on the side that holds the threaded product P by the force of the spring 9, and the other end 8b is an end on the side that releases the product P and is always The shape and the like of the claw 8 are determined so as to project from the outer peripheral surface 7a of the product take-out board 7.

As shown in FIGS. 1 and 2, a cylindrical holder 12 is fitted on the circular outer peripheral surface 7a of the product take-out board 7. The holder 12 guides the movement of the product take-out board 7, the rear end face thereof is fixed to the base plate 4, and the front end face has a two-stage structure. It is a retreat surface 12a that allows the product P to fall when P is removed from the core pin 3 and allows the other end 8b of the claw 8 to pass. The remaining approximately one-fourth area is the projecting surface 12b, and constitutes a claw engaging member 12c capable of pressing the other end 8b to swing the claw 8 against the spring 9.

Next, the operation will be described.

After the mold is clamped, the molding material is injected into the cavity 2 to mold the threaded product P. The product take-out board 7 is kept waiting above the die.

Next, the mold is opened, and the device B is lowered to face the movable mold 1a as shown in FIG. Then, as shown in FIG. 3 (b), the core pin 3 is held while holding the product P with a screw,
Make it protrude. At this time, the threaded product P is located between the contact portions 7e, 7f as shown in FIG. 3 (a). Prior to the protrusion of the core pin 3, the driving means 10 is actuated to rotate the product take-out board 7 about 10 ° in the clockwise direction in FIG. And swing it counterclockwise.

Next, when the drive means 10 is driven, the drive shaft 10a rotates,
It is transmitted to the product take-out board 7 through the key 11, the product take-out board 7 rotates counterclockwise, and the contact portions 7e, 7f engage with the threaded product P as shown in FIG. 4 (a). Further, since the claw 8 is separated from the claw engaging member 12c, the force of the spring 9 causes the threaded product P
Press the upper part of the left side of the.

Further, when the drive means 10 continues to rotate in the same direction,
As shown in FIG. 5 (a), the screwed product P rotates while being sandwiched between the contact portions 7e and 7f. At this time, since the product take-out board 7 is screwed with the nut 6, it retreats while sliding on the key 11, and the nut 6 and the core pin 3 have the same pitch. The screwing with the core pin 3 is released without changing the contact position with 7e and 7f (Fig. 5 (b)).

Next, as shown in FIGS. 6A and 6B, when the product take-out board 7 is rotated about 190 ° from the initial state, the threaded product P is separated from the core pin 3, but the threaded product P is It is sandwiched between the contact portion 7f and the claw 8 and held on the product unloading board 7 as it is.

Next, as shown in FIGS. 7 (a) and 7 (b), the core pin 3 is retracted, and the product unloading board 7 is moved in the reverse direction (clockwise direction) by about 19
When it is rotated 0 °, the pawl 8 is rotated as shown in FIG. 8 (a).
The other end 8b of the claw 8 abuts on the claw engaging member 12c, the claw 8 swings against the spring 9, the holding of the threaded product P is released, and a predetermined product pedestal below (not shown) (Fig. 8 (b)).

Thereafter, the process of returning the take-out device B to the upper standby position, performing mold clamping, molding the next product by injection molding, and taking out the product using the product take-out board 7 by the same process as described above is repeated.

In the above embodiment, the device B is lowered and set, and then the core pin 3 is projected. However, the product take-out board 7 may be lowered after the core pin 3 is projected.

Further, the product pedestal or the like is arranged at a position different from the mold position, and the product pedestal or the like is provided while the screwed product P is sandwiched between the contact portion 7e and the claw 8. It may be moved to and dropped at that position.

[Effect] In the device for taking out a product with a screw of the present invention, since the screwing of the product with a screw and the core pin is released by rotating the product take-out board, the danger of manual work can be eliminated.
The decrease in work efficiency can be reduced. Also, since the take-out device for threaded products is provided separately from the mold, it is possible to prevent the mechanism of the mold from becoming complicated and the accuracy of the product from decreasing when a mechanism for rotating the core is provided in the mold. it can.

Further, since a claw biased in one rotation direction by a spring is provided on the product take-out board, and a fixed claw engaging member that swings against the spring is provided on the claw, a product with a screw and a core pin are provided. Even after the screwing with is released, the product with a screw can be held by being sandwiched between the abutting portion and the claw biased by the spring force, and the holding is released by the reverse rotation of the product take-out board. It is possible to prevent the product with screws from falling in an unprepared place.

Further, since the holder that is fitted onto the circular outer peripheral surface of the product take-out board is fixedly provided, it is easy to provide the claw engaging member, and the movement of the product take-out board can be guided and accurately controlled. .

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a front view of a portion of FIG. 1 seen from the AA plane, and FIGS.
FIG. 8 is an explanatory view showing a process of taking out a product with screws,
Each (a) is a front view seen from the AA plane in FIG. 1, and each (b) is
FIG. 4 is a cross-sectional view showing the positions of the threaded product and the core pin in each state (a). 1 ... Molding die device (movable type), 3 ... Core pin, 3a ...
… Screw part of core pin, 6 …… nut, 7 …… product take-out board, 7a …… circular outer peripheral surface, 7b …… screw shaft part, 7d …… key groove, 7e, 7f …… contact part, 7g …… Shaft, 8 ... Claw, 9 ... Spring, 10 ... Driving means, 10a ... Driving shaft, 11 ... Key, 12
…… Holder, 12c …… Claw engaging member, P …… Screwed product.

Claims (2)

[Claims] 1. A molding die apparatus including a core pin having a threaded portion formed at a tip end thereof for molding a threaded product, wherein the core pin is projected while the threaded product is screwed in a mold open state. A product take-out board facing the molding die device in the mold open state and provided with a contact portion on the front surface for engaging with the threaded product screwed to the projecting core pin; The fixed nut with which the screw shaft portion provided on the rear surface of the take-out board is screwed, the drive shaft with which the screw shaft portion is relatively unrotatable and capable of moving forward and backward in the axial direction, and the drive shaft Driving means for rotating, a pawl rotatably supported at a position facing the contact portion on the product take-out board, a spring for urging the pawl in one rotation direction, and one end of the pawl. And a claw engaging member fixed at a fixed position where it can abut, Even after the screwing with the core pin is released, the screwed product is held by being sandwiched between the contact portion and the claw biased by the force of the spring, and the product take-out board is rotated in the reverse direction. Then, the claw is opened by bringing the claw into contact with the claw engaging member, and the holding of the screwed product on the product take-out board is released. 2. The product take-out board has a circular outer peripheral surface, and a holder that is fitted onto the circular outer peripheral surface and guides the movement of the product take-out board is fixedly provided. The device for taking out a product with a screw according to claim 1, wherein the device is provided on a holder.