JPS59162029A - Marking device for rubber ball - Google Patents

Abstract

PURPOSE:To make possible many kinds of markings due to molds for vulcanizing the same ball by a method wherein in a state wherein a thin marking plate abuts on the insides of ball vulcanizing molds, an unvulcanized rubber ball is vulcanized and necessary kinds of inexpensive marking plates are provided. CONSTITUTION:A marking plate 9 is inserted into an air injecting fitment 7 in its center hole 11 and the marking plate 9 as well as an unvulcanized rubber ball 3 is inserted into the empty space 4 between molds 1, 2. If compressed air is supplied into the unvulcanized ball 3 through the air injecting fitment 7, the unvulcanized rubber ball 3 is pushed against the insides of the ball vulcanizing molds 1, 2, heated and forms a product ball 12. At the same time with the vulcanizing process rear ruggednesses 10 composed of letters, diagrams or signals, etc. on the marked plate 9 are imprinted as marked letters etc. 13 on the surface of the producted ball 12. Therefore, the same molds 1, 2 can be used to another mark also by changing the marking plate 9 only and it is easy to work the marked plate 9 if it is of a thin metal sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a marking device by stamping a rubber ball. For marking rubber balls, a marking method using ink, ink, or the like is generally used, and a stamping marking device using a stamp engraved on the surface of a mold is commonly used.

Color marking equipment can print directly onto the surface of unvulcanized rubber, apply transfer marks for rubber to the surface of unvulcanized balls and then vulcanize them, or print on vulcanized rubber balls. A set of ink spray markings using transfer marks, printing, or masking has already been carried out on the surface of.

Marking with ink allows for the creation of colorful marks and delicate lines and marks, but the lifespan of the marks themselves is relatively short, and the disadvantage is that they disappear as the ball surface wears down. In a marking device using engraving, uneven characters or marks are engraved in advance on the inner surface of a ball vulcanization mold, and this mold is used to vulcanize a rubber ball. The convex markings on the inner surface of the mold become concave letters on the surface of the product ball, making it possible to make durable markings that will not disappear even with some rubber wear.

By further applying ink to this engraved mark by spraying or the like, a product with even better commercial value can be obtained. However, when stamping different characters or marks, there is a drawback that another expensive mold must be prepared.

The present invention was made to solve these problems, and by preparing the necessary types of inexpensive stamping plates, it is possible to make many kinds of stamps with the same ball curing mold. be.

The present invention will be described in detail based on the drawings.

In Figures 1 and 2, numeral 1 is the marking plate, which is generally made of a thin piece of metal, but depending on the size of the mark, the position of the mark, the shape of the letters, etc., it may be made of heat-resistant non-metallic material such as photosensitive resin. An engraved plate may also be used. The character portion of the stamping plate 1 is formed in a convex or concave shape, and the characters are engraved with back characters to form back unevenness 8 so that the characters look normal when appearing on the ball surface.

FIG. 3 is a vertically cut side view of the unvulcanized rubber ball 3 with the air injection fitting 2 attached, and the center hole 4 of the stamping plate 1 is fitted into the air injection fitting 2 as shown in FIG. do. Next, as shown in FIG. 5, the stamping plate 1 is placed together with the unvulcanized rubber balls 3 into a ball curing mold 5.6. Thereafter, when compressed air is fed into the unvulcanized rubber ball 3 through the air injection fitting 2, the unvulcanized rubber ball 3 is pressed against the inner surface of the ball curing mold 5.6 and heated. This becomes a product ball 3a.

Thus, at the same time as the vulcanization process, the back unevenness 8 consisting of characters, figures, symbols, etc. of the stamping plate 1 can be placed on the surface of the ball 3a as stamped characters 7. After the ball is vulcanized, it is taken out from the ball vulcanization mold 5.6 and the stamping plate 1 is removed together with the air injection fitting 2, so that stamped characters etc. 7 are clearly formed on the ball surface. The stamping plate l can be used repeatedly when vulcanizing the next ball.

Conventional engraving-type marking devices directly engrave the ball curing mold, so it is a dedicated mold for a specific mark, and it is necessary to manufacture a dedicated mold for each different mark. there were.

The marking device according to the present invention can make another mark by simply replacing the marking plate 1 with the same ball curing mold 5.
．． It can also be manufactured using 6, or it can be manufactured using engraved plate 1.
If a thin metal plate is used, it can be easily processed and is very economical.

In particular, the present invention, which uses an engraved plate, is useful for balls that have the same main mark but different product numbers, internal pressure indications, etc.

Furthermore, in the conventional marking method around the air injection port, the marking is divided into two parts depending on the structure of the ball curing mold. Therefore, the engraved mark was also divided into two parts, making it impossible to create continuous letters or circles. In the present invention, continuous characters and figures can be created at the mating portion of the ball curing mold simply by changing the outer shape of the stamping plate.

The engraving plate can be easily obtained by sandwiching a metal piece with a thickness of 0.1 to 0.2 mm between uneven engraving molds and compressing it.

A center hole is made in the center of the marking plate through which the air injection fitting passes, and by passing the air injection fitting through the hole, marking characters can be accurately placed around the pulp pro of the ball.

In addition to metal pieces, the stamp plate can also be made from a stamp material such as photosensitive resin or a heat-resistant resin plate.

As described above, the rubber ball marking device according to the present invention abuts the thin stamping plate 1 with the back unevenness 8 for letters etc. on the inner surface of the ball curing molds 5 and 6 during the rubber ball manufacturing process. In this state, the unvulcanized rubber ball 3 is vulcanized to form engraved characters 7 on the surface of the vulcanized product rubber ball. In addition, the rubber pole marking device according to the present invention, in the rubber ball manufacturing process, fits a thin stamping plate with irregularities 8 on the back side such as letters to the air injection fitting 2 attached to the unvulcanized rubber pole 3.
The unvulcanized rubber ball is vulcanized with the stamping plate in contact with the inner surface of the pole vulcanization mold 5.6, and stamped characters, etc. 7 are stamped on the surface of the vulcanized product rubber ball around the air injection port. is formed. Note that the engraved plate may be a thin metal piece or a non-metallic plate engraved with photosensitive resin or the like.

[Brief explanation of drawings]

The drawings are for explaining an embodiment of the rubber ball marking device according to the present invention, and FIG. 1 is a front view of the marking plate, FIG. 2 is a vertical cut side view of the same, and FIG. A vertically sectioned side view of the unvulcanized rubber ball with the metal fitting attached, Figure 4 is a side view of the unvulcanized rubber ball with the stamp plate fitted to the air injection metal fitting, and Figure 5 is the unvulcanized rubber ball. Figure 6 is a side view of the ball being placed in the pole curing mold with no air injected, Figure 6 is a side view showing the pole being vulcanized in the pole curing mold, and Figure 7 is A side view of the vulcanized product pole, FIG. 8 is a partially enlarged vertical cutaway side view of the same as above, and FIG. 9 is a front view of the vulcanized product pole. 1 Engraved plate 2 Air injection fitting 3 Unvulcanized rubber ball 5.6 Pole vulcanization mold 7 Engraved characters, etc. 8 Back uneven patent applicant Molten Co., Ltd. Agent Patent attorney Takehiro Furuta-Zeng Procedural amendment letter ( 2) Patent application filed on October 15, 1980 (1) 2, Name of the invention Rubber ball marking device 3, Relationship with the case of the person making the amendment Patent applicant Molten Co., Ltd. 4, Agent ■730 5, Date of amendment order: Voluntary amendment 6, Number of inventions increased by amendment -17, Full text of the specification to be amended 8, Contents of amendment: Specification 1 as attached, Title of invention: Rubber ball marking device 2, Claims W rubber pole marking device. 3. Detailed Description of the Invention The present invention relates to an improvement in a marking device by stamping a rubber ball. In this type of conventional marking device, uneven characters or marks are engraved in advance on the inner surface of a ball vulcanizing mold, and the rubber ball is vulcanized using this mold. The convex markings on the inner surface of the mold become concave letters on the surface of the product ball, making it possible to make durable markings that will not disappear even with some rubber wear. However, this method has the following drawbacks. (b) When stamping different characters or marks, or when stamping the same type of characters or marks in different positions on the ball, separate molds must be prepared accordingly, which increases costs. becomes. (b) When polishing the surface of the mold to a mirror finish, accidents such as chipping of the unevenness of the engraved part are likely to occur. In particular, when the surface of the mold is plated, there are many accidents during the subsequent huffing process, and when balls are manufactured using such a mold, the letters and marks are naturally incomplete and difficult to read. The product value will decrease. (c) Normally, the rubber ball is vulcanized with two hemispherical recesses.
Two molds are placed one on top of the other, and a ball is inserted into the internal spherical space. Traces of this are left on the surface of the ball corresponding to the mold joining line, and engraved parts such as letters and marks are placed on these traces. If they overlap, the characters and marks will be difficult to read. (d) When stamps such as letters and marks are formed across two molds, it requires extremely advanced technology and is virtually impossible to finish a continuous mark, etc. with both stamps. It is. This invention was made to solve these problems, and by preparing the necessary types of inexpensive stamping plates, it is possible to make many kinds of stamps with the same ball curing mold. be. The present invention will be described in detail based on the drawings. The embodiment is an example in which a mark is placed around the air injection hole of the hole. 1.
Reference numeral 2 denotes a ball curing mold, and at least two molds are used to form a hollow region 4 having a shape that matches the external shape of the unvulcanized rubber ball 3.
It consists of two parts. Further, an air injection hole 5 is formed in the rubber ball 3 so as to coincide with a joint portion 6 of the mold 1.2. Reference numeral 7 denotes an air injection fitting, which is inserted into the air injection hole 5 through a through hole 8 provided in the mold joint 6. Reference numeral 9 denotes a stamping plate, which is generally a thin metal piece, but depending on the size of the mark, the position of the mark, the shape of the characters, etc., a heat-resistant stamping plate made of a non-metallic material such as a photosensitive resin may be used. The character portion of the stamping plate 9 is formed in a convex or concave shape, and the character is engraved with a reverse character to form a reverse surface 10 so that it appears normal when it appears on the ball surface. First, the engraving plate 9 is fitted into the air injection fitting 7 at its center hole 11 as shown in FIG. Next, as shown in FIG. 1, the stamping plate 9 is inserted into the hollow area 4 in the molds 1 and 2 together with the unvulcanized rubber balls 3. After that, the unvulcanized rubber ball 3 is inserted through the air injection fitting 7.
When compressed air is fed into the unvulcanized rubber ball 3, the unvulcanized rubber ball 3 is pressed against the inner surface of the ball curing mold 1.2 and heated to become a product ball 12 as shown in FIGS. 8 and 9. Simultaneously with the vulcanization process, the back unevenness 10 consisting of characters, figures, symbols, etc. of the stamping plate 9 is inscribed on the surface of the product ball 12 as stamped characters, etc. 13. After vulcanization, the engraving plate 9 and the air injection fitting 7 are removed from the mold 1.2 and can be used repeatedly when vulcanizing the next ball. As described above, the present invention includes molds 1 and 2 that are made up of at least two parts that form a hollow region 4 having a shape that matches the external shape of the rubber ball 3 during bonding, and the hollow region 4 of the molds is installed at an appropriate position on the wall surface. Convex and removable back surface with letters, etc. 10
The unvulcanized rubber ball 3 is housed in the hollow area 4 of the upper mold, and at the same time as it is vulcanized, the stamp plate 9 stamps a stamp 13 on the ball surface.
is formed. Conventional marking equipment directly stamps the markings on the ball curing mold, so it is a dedicated mold for specific marks.
It was necessary to install a special mold for each different mark, but according to the marking device of the present invention, the same mold 1, can be used for different marks by simply replacing the marking plate 9.
2 can be used, and if the stamping plate 9 is also a thin metal plate, it can be easily processed and is very economical. The present invention, which uses marking plates 1 and 9, is particularly useful for balls with the same main mark but different product numbers, internal pressure indications, etc. In addition, when polishing the mold surface to a mirror finish using a puff polisher, etc., the engraving plate is removed, so there is no risk of damage to the uneven letters, marks, etc. that were previously caused, which improves the life of the mold and makes polishing work easier. Simplification can be achieved at the same time. In particular, the engraved plate with the fine letters formed in an uneven shape,
With repeated use, there is a high possibility that the corners of the convex parts will be chipped or damaged. However, since this engraving plate can be manufactured at a low cost, in the event of such an accident, it is only necessary to replace it, and the cost can be kept low compared to the conventional case where the entire mold was replaced. Furthermore, in the conventional example, when forming a stamp around the air inlet, the ball curing mold is divided into two hemispherical parts, so this stamped part is also divided into two. In general, traces are left on the ball surface corresponding to the mold joining line, which causes letters, marks, etc. to become unclear, but according to the present invention, this engraved part becomes a continuous surface. Therefore, there is no risk of being adversely affected by such traces. Furthermore, it has been impossible to form continuous characters or circles with the conventional two-part stamp mark, but according to the present invention, by using a stamp plate, it is possible to You can also easily create continuous letters and figures. An engraving plate can be easily made by sandwiching a 0.1 to 0.2 mm thick metal piece between uneven engraving molds and compressing it.You can also make an engraving plate using a stamping material such as photosensitive resin or a heat-resistant resin plate. You can make it. When the above-mentioned photosensitive resin is used, clear uneven characters can be formed on the resin surface by a known photoetching method. In the above example, the place to be engraved was set around the air inlet on the surface of the rubber ball, but it is not limited to this, and it is also possible to place it at any position within the mold, and it is also possible to place it at any position within the mold. They can be installed at the same time, and by changing their position or number, it is possible to imprint a different pattern on each ball. This makes it possible to inexpensively manufacture a wide variety of balls in small quantities using one mold. 4. Brief description of the drawings The drawings are for explaining one embodiment of the rubber ball marking device according to the present invention. Fig. 1 shows an unvulcanized rubber ball without air being injected into the hollow area. Figure 2 is a cross-sectional view of the ball curing mold showing the vulcanized state of the ball, and Figure 3 is a cross-sectional view showing an enlarged part of the vulcanized product ball. Fig. 4 is a vertically cut side view of the unvulcanized rubber ball with the air injection fitting attached, Fig. 5 is a front view of the stamping plate, Fig. 6 is a vertically cut side view of the same as above, and Fig. 7 Figure 8 is a side view of the unvulcanized rubber ball with the stamp plate fitted to the air injection fitting.
The figure is a side view of the vulcanized product ball, and FIG. 9 is a front view of the same. 1.2 Ball curing mold 3 Unvulcanized rubber ball 4 Hollow region 5 Air injection hole 6 Mold joint 7 Air injection fitting 8 Through hole 9 Engraved plate 10 Back unevenness 11 Center hole 12 Product ball 13 Engraved characters Patent applicant Takehiro Furuta, patent attorney Molten Co., Ltd.

Claims (1)

[Scope of Claims] 1. In a rubber ball manufacturing device, an unvulcanized rubber ball is vulcanized while a thin stamping plate with an uneven back surface such as letters is in contact with the inner surface of a ball vulcanization mold. A marking device for a rubber ball, characterized in that it forms engraved characters, etc. on the surface of a rubber ball. 2. In the rubber ball manufacturing equipment, a thin engraved plate with an uneven back surface such as letters is fitted to the air injection fitting attached to the unvulcanized rubber ball, and the engraved plate touches the inner surface of the ball curing mold. Rubber ball marking device 3 characterized in that an unvulcanized rubber ball is vulcanized in a state in which it is in contact with the rubber ball, and stamped characters, etc. are formed on the surface of the rubber ball around the air injection port, and the stamping plate is a thin metal piece. A rubber ball marking device according to claim 1 or 2, characterized in that: 4. The rubber ball marking device according to claim 1 or 2, wherein the marking plate is a non-metallic plate engraved with photosensitive resin or the like.