JP5280179B2 - Ejection pin rotation adjustment mechanism and mold having the rotation adjustment mechanism - Google Patents

Description

  The present invention relates to a rotation adjusting mechanism for an eject pin that ejects a molded product from a mold after mold release and engraves a mark at the time of molding, and a mold including the rotation adjusting mechanism.

9 (a), 9 (b), and 10 are cross-sectional views showing a conventional mold for foamed resin molding. As is well known, the mold (8) is composed of a fixed mold (7) having a back plate (70) and a movable mold (80), and a space (between the molds (7) and (80)) ( 81) is filled with foamed resin from a raw material filling cylinder (73) provided in the fixed mold (7). The pin guide (5) passes through the fixed mold (7), and the eject pin (1) fits in and out of the pin guide (5). The eject pin (1) is interlocked with the reciprocating operation of the eject plate (9) located outside the fixed die (7). The eject pin (1) is provided with a spring receiver (18) in the longitudinal direction, and a spring (90) is provided between the spring receiver (18) and the back plate (70) of the fixed mold (7).
As shown in FIG. 9 (a), the foamed resin is filled into the space (81) from the raw material filling cylinder (73) in a state where both molds (7) and (80) are combined. After the filled foamed resin is heated and molded with steam, the movable mold (80) is moved and released as shown in FIG. 9 (b). Next, as shown in FIG. 10, the eject plate (9) is pushed against the spring (90), and the eject pin (1) pushes out the molded product (95). In the following description, the direction in which the eject pin (1) pushes out the molded product (95) is defined as the front. When the pushing operation of the eject plate (9) is released, the eject pin (1) returns to the original position shown in FIG. 9 (a) by the spring (90) force.

FIG. 11 is a side sectional view of a conventional eject pin (1) (see Patent Document 1). The eject pin (1) is provided with a pin main body (10) and a bowl-shaped head (11) that is disposed at the tip of the pin main body (10) and comes into contact with a molded product. (15) is formed. An indicator plate (16) with an arrow pointing to the outer periphery is fastened to the recess (15) with a screw (17).
FIG. 12 is a front view of the front end surface of the head (11). On the head (11), around the indicator plate (16), there is formed a display part (19) in which numbers representing the year of manufacture or month are engraved in the opposite direction, and the arrow on the indicator plate (16) The screw (17) is fastened in a state of being directed to the number representing the year or month of the production lot.
When the head (11) of the eject pin (1) contacts the molded product (95) being solidified, an arrow and a number are imprinted on the surface of the molded product (95). Since the numbers appear opposite to the display unit (19), the numbers with the correct orientation are imprinted on the molded product (95). As a result, the date and time of manufacture of the molded product (95) can be known, which is useful for traceability of the molded product (95).

JP-A-2005-14568

In the conventional eject pin (1), the eject pin (1) may rotate inadvertently with the longitudinal direction as the central axis in the pin guide (5). In this case, the direction of the marking on the molded product (95) is not constant, and the appearance is not only poor, but the production date and time of the molded product (95) may be unclear.
An object of the present invention is to provide a rotation adjusting mechanism that prevents the eject pin from rotating inadvertently about the longitudinal direction as a central axis.

  Used in a mold (8) having a fixed mold (7) and a movable mold (80), and is provided at the tip of the pin body (10) and the pin body (10) to form an index on the tip surface A mechanism for adjusting the rotation of the eject pin (1) including the formed head (11) is attached to the fixed die (7), and is a hollow pin guide (5) that guides the pin body (10) so that it can protrude and retract. ), A bush (2) which is attached to the pin guide (5) and rotatably receives a receiving member (3) through which the pin body is inserted in a state where the rotation of the pin body (10) is restricted, and a bush ( 2) a first fastener that is fitted to 2) and switches between rotation and rotation restriction of the receiving member (3).

  In order to adjust the index of the head (11), specifically the arrow, to a predetermined rotational position, the first screw (30) is loosened to adjust the rotation of the eject pin (1). After this, if the first screw (30) is tightened to restrict the rotation of the receiving member (3), inadvertent rotation of the eject pin (1) is restricted. In the conventional configuration, the eject pin (1) may rotate inadvertently during molding, but in the present invention, the receiving member (3) is ejected with a simple configuration in which the first screw (30) is tightened. Inadvertent rotation of the pin (1) can be restricted. Thereby, traceability of the molded product can be reliably performed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a mold (8) in which an eject pin (1) according to this example is used. As in the prior art, the mold (8) is composed of a fixed mold (7) and a movable mold (80). The fixed mold (7) is a concave mold (71) facing the movable mold (80) and a fixed mold. It has a frame (75) and a back plate (70). In this example, the concave mold (71) is provided in the fixed mold (7), but a convex mold may be used instead.
A hollow pin guide (5) is fixed to the back plate (70) to guide the protrusion and withdrawal of the eject pin (1). A bush (2) is provided substantially coaxially with the eject pin (1) at the rear end portion of the pin guide (5). The bush (2) is centered on an axis L along the longitudinal direction of the eject pin (1). It is provided so as to be rotatable with respect to the pin guide (5).
As will be described later, the bush (2) constitutes a rotation adjusting mechanism for the eject pin (1). The eject pin (1) passes through the pin guide (5) and the bush (2), and the rear end is connected to the eject plate (9). A spring (90) is provided between the eject plate (9) and the bush (2), and when the eject plate (9) advances, the molded product protrudes from the fixed mold (7) and is returned by the spring (90). This is the same as in the prior art.

FIG. 2 is a perspective view of the pin guide (5) in which the eject pin (1) is fitted. FIG. 3 is a cross-sectional view of the pin guide (5) of FIG. It is sectional drawing seen from the arrow. The eject pin (1) is configured by providing a hook-shaped head (11) with an arrow (12) as an index at the tip of a long pin body (10). The outer periphery of the pin body (10) is hexagonal or elliptical. In the following description and drawings, for convenience of description, the pin body (10) will be described on the assumption that the outer periphery is a hexagon.
The pin guide (5) has a cylindrical shape, and a through hole (51) in which the eject pin (1) is fitted is opened at the center (see FIG. 6). That is, the eject pin (1) can rotate within the pin guide (5). On the pin guide (5), a flange (50) is provided on the tip side of the bush (2), and the flange (50) is attached to the back plate (70) with bolts (not shown). The pin guide (5) is fixed to the fixed mold (7).
A first screw (30) is screwed onto the upper end of the bush (2), and the first screw (30) contacts the outer periphery of a receiving member (3) built in the bush (2).
The second screw (20) is screwed onto the lower end of the bush (2), and when the second screw (20) is tightened as described later, the bush (2) is fixed to the pin guide (5). And rotation is restricted. When the second screw (20) is loosened, the bush (2) is allowed to rotate.

  As shown in FIG. 3, a mounting hole (72) is formed in the concave mold (71) of the fixed mold (7), and a display piece (6) in which numerals or symbols are engraved on the peripheral edge of the mounting hole (72). ) Is fitted. The head (11) fits substantially concentrically within the display piece (6). 4A, 4B, and 4C are side views of the head 11 and the display piece 6 in FIG. 3 as viewed from the B direction. The display piece (6) can be replaced with the concave mold (71). As shown in FIG. 4 (a), the display piece (6) shows the year of manufacture of the molded product, and FIG. As shown, there are those showing the month of manufacture of the molded product and those showing the date of manufacture of the molded product as shown in FIG. 4 (c). By rotating the pin body (10) about the axis L and directing the tip of the arrow (12) toward a number or symbol, the date of manufacture, month and date are given to the surface of the molded product.

  FIG. 5 is a cross-sectional view of FIG. 3 taken along the vertical plane including the line CC and viewed from the direction of the arrow. The receiving member (3) has a circular outer periphery, and has a hexagonal section rotation restricting hole (31) into which the eject pin (1) is fitted. That is, the receiving member (3) rotates together with the eject pin (1). The first screw (30) is tightened, the tip of the first screw (30) presses the receiving member (3), and the rotation of the receiving member (3) is restricted. Accordingly, the eject pin (1) cannot be rotated. As a result, the eject pin (1) is rotated so that the tip of the arrow (12) of the head (11) faces the numeral or symbol on the display piece (6), and then the first screw (30) is tightened. Inadvertent rotation of the eject pin (1) is restricted.

  FIG. 7 is an enlarged view showing the vicinity of the second screw (20). Since the bush (2) is rotatably fitted to the pin guide (5), there is a slight gap between the inner surface of the bush (2) and the pin guide (5). When the second screw (20) is tightened, the pin guide (5) is pressed against the inner surface of the bush (2), as shown by E part in FIG. 2) cannot be rotated.

Since the bush (2) has an outer diameter larger than that of the eject pin (1), it is easy to rotate. Accordingly, if the eject pin (1) is rotated together with the bush (2), it is easy to roughly adjust the rotation of the eject pin (1).
To turn the arrow (12) of the head (11) toward the number or symbol on the display piece (6), loosen the second screw (20) with the first screw (30) lightly fastened. Rotate the eject pin (1) together with the bush (2), adjust the eject pin (1) to rotate roughly, and tighten the second screw (20).
Next, after loosening the first screw (30) and finely adjusting the rotation of the eject pin (1), tightening the first screw (30) will cause inadvertent rotation of the eject pin (1). Be regulated.
Since the eject pin (1) is rotated together with the bush (2), if the arrow is attached to the bush (2) in the same direction as the head (11), the direction of the arrow (12) of the head (11) It can be confirmed from the bush (2) and is convenient.

In this example, careless rotation of the eject pin (1) can be restricted by a simple configuration in which the first screw (30) is fastened to the receiving member (3).
In the above example, the number or symbol to which the arrow (12) of the head (11) is directed is stamped on the display piece (6), but it may be stamped directly on the fixed mold (7).
In the above description, the first screw (30) is pressed against the outer periphery of the receiving member (3) to prevent rotation. However, as shown in FIG. 8, a recess (35) is provided on the outer periphery of the receiving member (3), and a stop pin (55) biased downward by a spring (56) is provided on the pin guide (5). The pin (55) may be inserted into the recess (35) to stop the rotation of the receiving member (3).

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

It is sectional drawing of the metal mold | die in which the eject pin concerning this example is used. It is a perspective view of the pin guide in which the eject pin was fitted. It is sectional drawing which fractured | ruptured the pin guide of FIG. (a), (b), (c) is the side view which looked at the head and display piece of FIG. 3 from the B direction. It is sectional drawing which fractured | ruptured FIG. 3 in the vertical surface containing CC line and was seen by the arrow. It is sectional drawing which fractured | ruptured the pin guide of FIG. It is an enlarged view showing the neighborhood of the 2nd screw. It is sectional drawing which shows the receiving member of another Example. (a), (b) is sectional drawing which shows the conventional mold for foaming resin molding. It is sectional drawing which shows the conventional metal mold | die for foaming resin molding. It is side surface sectional drawing of the conventional eject pin. It is a front view of the front end surface of a head.

Explanation of symbols

(1) Eject pin
(2) Bush
(3) Receiving member
(5) Pin guide
(7) Fixed type
(8) Mold
(10) Pin body
(11) Head
(30) First screw

Claims (4)

A mechanism for adjusting the rotation of an eject pin used in a mold having a fixed die and a movable die, and comprising a pin main body and a head disposed at the tip end portion of the pin main body and having an index formed on the tip end face. Because
A hollow pin guide that is attached to a fixed mold and guides the pin body so that it can protrude and retract, and a receiving member that is attached to the pin guide and allows the pin body to be inserted while restricting the rotation of the pin body is rotatably incorporated. And an eject pin rotation adjustment mechanism comprising the bush and a first fastener fitted to the bush to switch between rotation and rotation regulation of the receiving member. 2. The eject pin rotation adjusting mechanism according to claim 1, wherein the bush is rotatably attached to the pin guide, and includes a second fastener fitted to the bush to switch the rotation of the bush relative to the pin guide and the rotation restriction. 3. The eject pin rotation adjusting mechanism according to claim 1, wherein the indicator on the head is an arrow, and the bush is provided with an arrow in the same direction as the head. A mold comprising the rotation adjusting mechanism for the eject pin according to any one of claims 1 to 3.

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