JP3470880B2 - In-mold removable marking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking device for marking on the surface of a molded product at the time of molding a mold, and more particularly, it is possible to easily carry out the exchanging work of the marking without causing unevenness on the surface of the molded product. The present invention relates to an in-mold detachable marking device capable of performing the attaching / detaching operation of the index body with good operability and accurately and easily positioning the index body according to the marking position of the outer shell.

[0002]

2. Description of the Related Art Molded products usually have the date of manufacture, lot number, product number, etc. displayed on their surface. Is going. These markings are made by inserting a display unit equipped with a marking display part on the inner surface of the molding die in a detachable manner, and molding the mold in the inserted state. It is designed to be stamped on.

As a conventional marking device of this type, there is a marking device as shown in FIG. 4, for example. The marking device (A) shown in FIG. 4 has a display outer shell (B) fitted in a mold.
And an index body (C) having a large diameter portion (c1) and a small diameter portion (c2) fitted into the display outer shell body (B), and an O-ring (D) attached to the indicator body (C). The display outer shell body (B) and the index body (C) are provided with a display portion formed of numbers or the like on their surfaces facing the inside of the mold. The marking device (A) is used by being inserted into the mold so that the display portions of the display outer shell (B) and the index body (C) face the inner surface of the mold. Shown on outer shell (B)
If the marking device (C) is configured to display the "month" and the indicator body (C) displays the "year", it is sufficient to replace only the indicator body (C) when the year changes, but the marking device ( A) The index body (C) cannot be removed unless the whole is removed from the mold, which is very troublesome and causes a reduction in work efficiency.

In view of such drawbacks, there is also a marking device as shown in FIG. 5, which can replace only the index body without removing the entire marking device from the mold. Figure 5
The marking device (A) shown has an outer shell (E) fitted in a mold, an index part (f1) facing the inner surface of the mold, and a screw part (f).
2) An index body (F) which is made of 2) and is fitted into the outer shell body (E).
Composed of and. The outer shell (E) has an inner diameter of two steps, and a thread groove is threaded on the lower step (e1), and the thread part (f2) of the index body (F) is screwed into this thread groove. Has been done. Then, the lower surface of the indicator portion (f1) and the outer shell (E)
A spring (G) is interposed between the upper step (e2) of
By rotating the index body (F) with a driver or the like to remove the screwing with the outer shell body (E), only the index body (F) can be removed from the mold. However, in the marking device shown in FIG. 5, the index body (F)
Is always urged by the spring (H) toward the inside of the mold, the index body (F) is likely to project from the outer shell (E) on the inner surface of the mold, and the index body (F) There was a problem that the outer shell (E) could not be kept flush and unevenness was generated on the surface of the molded product, so that a uniform molded surface could not be obtained.

[0005]

In view of the above situation, the inventor of the present application has disclosed in Japanese Patent Laid-Open No. 10-34671 that a spring force is applied to an index body in a direction in which its surface does not protrude from the outer shell surface. We have proposed an in-mold detachable engraving device that is energized. Since this marking device can keep the index body and the outer shell flush with each other, it was excellent in that no irregularities were formed on the surface of the molded product, but there were the following problems. . That is, in this marking device, in order to prevent the nut screwed in the threaded portion of the index body from rising when the index body is rotated clockwise in use,
Since the threaded portion and the nut of the index body were formed in the reverse thread (left-handed thread), the operability of the attachment / detachment operation of the index body was poor. Further, in the configuration in which the rotation preventing protrusion is provided on the outer peripheral surface of the screw and the protrusion is engaged with the engaging recess formed on the inner surface of the outer shell, only one protrusion is provided, There was a case where the detent was not functioning stably. In addition, since the lid mounted on the lowermost surface of the outer shell was a disc-shaped member having no holes, it was difficult to remove and attach the lid. Furthermore, it is difficult to accurately and easily position the index body according to the display position of the outer shell. The present inventors, as a result of continuing diligent research to solve the above problems,
The present invention has been completed.

[0006]

The present invention adopts the following means in order to solve the above-mentioned problems of the prior art. Claim 1
In the invention described above, a substantially cylindrical display outer shell body fitted in the molding die and an index body fitted in the display outer shell body and capable of angular displacement around the axis are provided, and markings are displayed on both surfaces. In the marking device in which a portion is formed, the index body is composed of an index portion facing the inner surface of the mold and a screw portion extended from this index portion, and the inner diameter of the display outer shell body is the index body. An upper step portion of a small diameter in which the index portion is positioned when inserted,
A large-diameter lower step portion in which the screw portion is located, a lid is screwed to the lowermost portion of the lower step portion, and a nut is screwed to the screw portion of the indicator body; A spring is interposed between the upper surface of the lower part of the display outer shell and the downward force of the index body by the spring, and a plurality of protrusions are provided on the outer circumference of the nut. At the same time, the lid body has a diameter larger than the outer diameter of the threaded portion at its center.
An engaging groove having a square hole is formed in the lower step of the display outer shell so that the projection can be engaged with the upper surface of the indicator portion and the upper surface of the display outer shell. In one state, the proximal end portion of the threaded portion of the index body is configured to be located above the upper end portion of the engagement groove, thereby providing an in-mold detachable marking device.

According to a second aspect of the invention, the finger of the index body is
Elastic body extending outward in the radial direction on the marking portion and the elasticity
A positioning member consisting of a sphere attached to the tip of the body is installed.
Sphere of the positioning member on the upper step of the display outer shell
A plurality of fitting grooves into which a part of the
Claims characterized in that they are formed at regular intervals.
The in-mold detachable marking device according to Item 1.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the in-mold detachable marking device according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an in-mold detachable marking device (1) according to the present invention, and FIG. 2 is a partially cutaway exploded perspective view thereof.
An in-mold detachable marking device (1) according to the present invention comprises a substantially cylindrical display outer shell body (3) fitted in a molding die, and an angle around the axis line in the display outer shell body (3). And an index body (4) which is displaceably fitted.

FIG. 3 is a sectional view showing an example in which the in-mold detachable marking device (1) is attached to a mold. The molding die (2) shown in FIG. 3 includes a stationary die (21) having an injection port (23),
The movable mold (22) comes in contact with and separates from the fixed mold (21), and a cavity (24) is formed between the fixed mold (21) and the movable mold (22). The removable marking device (1) includes a movable die (22) and a cavity (2
It is attached facing 4).

On the surface of the display outer shell (3) (the surface facing the inner surface of the mold), the numeral "1" representing the moon at equal intervals in the circumferential direction,
An engraved display portion composed of "2", "3", ..., "12" is formed, and a number representing the year ("99" in the illustrated example) and a display outer shell are formed on the surface of the index body (4). Arrow-shaped indicator (43) provided on the surface of the body (3) for indicating the month display
An engraved display part made of is formed, and the year and month can be simultaneously displayed by the year display displayed on the index body (4) and the month display pointed by the index (43). The index (43) is a groove that can be rotated by a driver.

The index body (4) is composed of an index part (41) and a screw part (42) extending from this index part (41), and the surface of the index part (41) is a mold (2). A disc-shaped index surface (41a) facing the inner surface and this index surface (41a)
The index base portion (41b) having a diameter smaller than that of the index surface portion formed in the lower part of a). The index base (41b) is provided with a positioning member (9) including a spring (91) extending outward in the radial direction and a sphere (92) attached to the tip of the spring (91). ing. The direction of the arrow of the index (43) coincides with the extending direction of the positioning member (9). The screw portion (42) is a forward screw (right screw).

The inner diameter of the display outer shell (3) is determined by the index body (4).
The lower step (32) includes a small-diameter upper step (31) in which the index part (41) is positioned when the is inserted and a large-diameter lower step (32) in which the screw part (42) is positioned. A lid (5) is screwed to the lowermost part of the. The inner diameter of the lower step portion (32) is formed such that the inner diameter of the female screw portion (33) to which the lid body (5) is screwed is larger than the inner diameters of other portions, and the length of the female screw portion is the thickness of the lid body. Is equal to.

A nut (6) is screwed to the lower end of the index body (4), and the nut (6) has an outer diameter substantially equal to the inner diameter of the lower step portion (32). Further, a spring (7) is interposed between the nut (6) and the upper surface of the lower step portion (32) of the display outer shell body (3), and the spring (7) directs downward to the indicator body (4). Is applied, that is, a force that acts so that the surface of the indicator body (4) does not protrude from the surface of the display outer shell body (3). Therefore, the surfaces of the display outer shell body (3) and the index body (4) are completely flush with each other, and a uniform molding surface can be obtained without causing irregularities on the surface of the molded product. When the year changes, rotate the indicator body (4) with a screwdriver to unscrew the nut (6), and remove only the indicator body (4) and replace it without disassembling the mold. Therefore, the replacement work is easy and the work efficiency is excellent.

A plurality of (three in the illustrated example) semicircular protrusions (61) are provided on the outer periphery of the nut (6), and the lower step portion (32) of the display outer shell body (3) is provided. These protrusions (6
An engaging groove (34) having a semicircular cross section that can be engaged with 1) is formed in the axial direction. In the present invention, the protrusion (61)
Is not particularly limited as long as it is plural, and may be two, four, or five or more. Further, the engaging grooves (34) are provided in the same number as the number of the protrusions (61). In this way, by making the number of the protrusions (61) plural, the rotation preventing function of the nut (6) can be stably exhibited.

In the in-mold detachable marking device (1) according to the present invention, as shown in FIG. 1, when the upper surface of the indicator portion (41) and the upper surface of the display outer shell (3) are flush with each other, The base end portion (42a) of the screw portion (42) of the index body (4) is configured to be located above the upper end portion (34a) of the engagement groove (34). This prevents the nut (6) from moving higher than the upper end (34a) of the engagement groove (34), and the nut (6) causes the nut (6) to move toward the proximal end (4) of the threaded portion (42).
2a) cannot be reached, and the nut (6) can be prevented from biting into the base end portion (42a). This eliminates the need for forming the threaded portion and the nut of the index body into a reverse thread (left thread) as in the conventional case,
The operability of the detaching operation of the index body is excellent.

A square hole (51) is provided in the center of the lid body (5), and by inserting a wrench or the like into the square hole (51), the lid body (5) is easily rotated and tightened. Is possible. In the illustrated example, the square hole (51)
Although the shape of is a quadrangle, it may be a hexagon or the like. Further, it may be a hole that does not reach the bottom surface of the lid body (5) instead of the through hole. The inner diameter of the square hole (51) is preferably formed larger than the outer diameter of the threaded portion (42) of the index body (4). The reason is that by forming the inner diameter of the square hole (51) larger than the outer diameter of the threaded portion (42) of the index body (4), as shown in FIG. 1, the threaded portion (42) of the index body (4) is formed. This is because it is possible to allow the tip of the bracket) to enter the square hole (51), and the length of the screw portion (42) can be increased. As a result, when the index body (4) is rotated during use, the number of rotations until the nut (6) and the screw part (42) are unscrewed increases, and the screw part and the nut of the index body are removed. Even when it is formed as a forward thread (right thread), the nut (6) and the threaded portion (42) are not disengaged during use.

In the upper part (31) of the display outer shell (3),
Plural insertion grooves (31a) into which a part of the sphere (92) of the positioning member (9) provided on the index base (41b) is inserted.
Are continuously formed at equal intervals along the circumferential direction. The number of fitting grooves (31a) may be appropriately set depending on how many times the index body (4) should be rotated. For example, as shown in the drawing, the index body (4) is rotated every month. In the case of a configuration, the number may be twelve. Sphere (92)
Is always biased radially outward by a spring (91), and in a normal state, the sphere (92) has one fitting groove (3).
1a), but when the index body (4) is rotated, the spring (91) contracts to cause the sphere (9) to rotate.
2) enters into the adjacent fitting groove (31a).
Thereby, the index body (4) can be accurately and easily positioned according to the display position of the display outer shell body (3).

In the in-mold detachable marking device (1) according to the present invention, the display outer shell body (3) and the indicator body (4).
The display content of is not limited to the example shown in the figure. For example, the indicator body (4) displays the month and the display outer shell body (3) displays the day, or the entire lot number or product number is displayed. Any configuration may be adopted as long as it is a display configuration that can be used for a long period of time by replacing only the indicator body (4).

[0019]

As described above, according to the first aspect of the present invention, the display outer shell body having a substantially cylindrical shape fitted in the molding die and the angular displacement around the axis line fitted in the display outer shell body are provided. A marking device comprising a possible index body and a marking display portion formed on both surfaces thereof, wherein the index body comprises an index portion facing the inner surface of the mold and a screw portion extended from this index portion. The inner diameter of the display outer shell comprises a small-diameter upper step portion in which the index portion is positioned when the index body is inserted, and a large-diameter lower step portion in which the screw portion is positioned. A lid is screwed to the lowermost part of the portion, a nut is screwed to the threaded portion of the index body, and a spring is interposed between the nut and the upper surface of the lower step of the display outer shell. , The spring applies a downward force to the index body, and a plurality of protrusions are formed on the outer circumference of the nut. The display outer shell body is provided with an engaging groove axially formed in the lower step of the display outer shell body, and the upper surface of the indicator portion and the upper surface of the display outer shell body are flush with each other. In this state, since the proximal end portion of the threaded portion of the index body is configured to be located above the upper end portion of the engagement groove, it is an in-mold removable marking device, the index body When rotating, it is possible to prevent the nut from biting into the screw base end part of the index part, and it is not necessary to form the thread part and nut of the index body into a reverse thread, and the operation of attaching and detaching the index body It has excellent properties. Moreover, the nut rotation preventing function can be stably exhibited.

Further, a square hole is provided at the center of the lid.
Since it is a detachable type marking device in the mold,
By inserting a wrench, etc. into the square hole, the lid can be easily rotated and tightened.By making the inner diameter of the square hole larger than the outer diameter of the threaded portion of the index body, Even when the portion and the nut are formed as a forward thread, the nut and the threaded portion will not be disengaged during use.

According to a second aspect of the present invention, the indexing portion of the index body is provided with a positioning member including an elastic body extending outward in the radial direction and a sphere attached to the tip of the elastic body. , claim, wherein a plurality of fitting grooves partially fitted sphere of the positioning member in the upper portion of the display shell body is formed by continuously and equidistantly along a circumferential direction
Since it is the in-mold detachable marking device described in 1 , the index body can be accurately and easily positioned according to the display position of the display outer shell body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of an in-mold detachable marking device according to the present invention.

FIG. 2 is a partially cutaway exploded perspective view showing a preferred embodiment of an in-mold detachable marking device according to the present invention.

FIG. 3 is a cross-sectional view showing an example in which the in-mold detachable marking device according to the present invention is attached to a mold.

FIG. 4 is an exploded perspective view showing an example of a conventional marking device.

FIG. 5 is a sectional view showing an example of a conventional marking device.

[Explanation of symbols]

1 In-mold detachable marking device 2 mold 3 Display outer shell 31 Upper part 32 Lower part 34 Engagement groove 34a Upper end of engaging groove 4 indicator 41 Indicator 42 Thread 42a base end 43 indicators 5 Lid 51 square hole 6 nuts 61 protrusions 7 spring 9 Positioning member 91 spring 92 sphere

Claims (2)

(57) [Claims] 1. A substantially cylindrical display outer shell body fitted in a molding die, and an index body fitted in the display outer shell body and capable of being angularly displaced around an axis line. In the marking device in which a portion is formed, the index body is composed of an index portion facing the inner surface of the mold and a screw portion extended from this index portion, and the inner diameter of the display outer shell body is the index body. It is provided with a small-diameter upper step portion in which the index portion is positioned when inserted and a large-diameter lower step portion in which the screw portion is positioned, and a lid is screwed to the lowermost portion of the lower step portion. At the same time, a nut is screwed on the threaded portion of the index body, and a spring is interposed between the nut and the upper surface of the lower step portion of the display outer shell, and the spring applies a downward force to the index body. In addition to having a plurality of protrusions on the outer periphery of the nut,
The lid is larger than the outer diameter of the threaded portion in the center thereof.
An engaging groove that has a square hole and is axially formed in the lower step of the display outer shell is engageable with the projection, and the upper surface of the indicator portion and the upper surface of the display outer shell are flush with each other. In this state, the in-mold detachable marking device is characterized in that the base end of the threaded portion of the index body is located above the upper end of the engagement groove. 2. The index portion of the index body is directed outward in the radial direction.
Elastic body extended and attached to the tip of the elastic body
The display outer shell body is provided with a positioning member including a body.
A part of the sphere of the positioning member fits into the upper step of
Insertion grooves are formed continuously and at equal intervals along the circumferential direction.
In-mold detachable engraving according to claim 1, characterized in that
Marking device.