JPH04343088A - Fabrication of face of timepiece - Google Patents

Abstract

PURPOSE:To fix easily three dimensional letters and the like with a variety of design on an arbitrary position on the base plate for the face of a timepiece by fixing the letters and the like formed with a female mold having a positioning guide hole. CONSTITUTION:By pressing and printing band material of brass or nickel silver on a female mold 7 which is carved with reversed shape of letters 4 and the like and has a positioning guide hole 6, projecting letters 4 and the like having bridge 8 are formed. After grinding or cutting the projecting surface, ornamental plating 2 is laid and then the letters 4 and the like of the projecting surface are fixed with removable film 9 to delete the bridge part 8. On the back of the letters 4 and the like, water-soluble pressure-sensing bonding agent 5 is applied. Next, the ornamental plating 2 with gold or silver and painting 3 are put on and the base plate 1 for the face of a time piece is set on a jig for bonding having a guide pin 10. The guide hole 6 is inserted in the guide pin 10 for positioning and the letters 4 and the like are printed and contacted on the base plate 1 and then it is pressed and the film 9 is removed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a watch dial.

0002

[Prior Art] There are generally three types of manufacturing methods for watch dials, in which letters, etc. are fixed on a watch dial substrate that has been conventionally decorated with decorative plating or painting. A method of drilling a hole in the substrate 1 of a watch dial, inserting a letter etc. 4 with legs 13 formed by a press or the like as a separate part through the hole, and fixing it by caulking or gluing. was there.

Second, as shown in FIG.
As described in Japanese Patent No. 13000, a resist film 11 is formed on appropriate parts of the substrate 1 of a watch dial whose upper surface is metal, and electroformed characters 4 are formed on the parts where the resist film 11 is not formed by plating. There is a method of fixing the characters 4 on the substrate of a watch dial by removing the resist film 11 after forming the resist film 11.

As shown in FIG. 5, which is described in Japanese Patent Publication No. 1-232284, letters etc. 4 are placed on a conductive substrate 1.
In addition, there is a step of applying a resist film 11, a step of electroforming on the conductive portion of the substrate 1 to form letters etc. 4 as an electroformed product, and a step of applying the electroformed product to the substrate 1 using a peelable adhesive film 9.
a step of applying adhesive to the position where the electroformed product is to be pasted on the substrate of the watch dial; and a step of transferring and pasting the electroformed product onto the dial and removing the peelable adhesive film. There was a method of fixing letters, etc. on the substrate of a watch dial.

[0005]

[Problems to be Solved by the Invention] However, the prior art 1 has the following problems. (1) It was necessary to drill holes or form feet in the substrate, letters, etc. of the watch dial, and furthermore, it required a large amount of processing man-hours to fix the letters, etc. one by one to the substrate of the watch dial by hand. (2) Since holes or feet are formed in the substrate, letters, etc. of a watch dial, it is technically difficult to keep the width and height of the letters, etc. below 0.3 mm due to constraints on the diameter of the awl.

Furthermore, prior art techniques 2 and 3 had the following problem. (1) As shown in Fig. 5, an electroformed product with a character 4 generally grows vertically and at the same time has side sprunging 12 that grows horizontally so as to cover the resist film 11, and as the electroformed product becomes taller. Since the pattern width also increases, there are design constraints, and the maximum height of characters (electroformed) on watch dials is about 0.1 mm. (2) As a method to improve the above problem, there is a method of thickening the resist film 11 using a dry film to prevent side splazing 12, but it is difficult to peel off the electroformed material and the adhesion of the resist film 11 is poor. .

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and its purpose is to easily fix letters, etc. that have a three-dimensional effect on a plated or painted watch dial substrate, thereby increasing the variety of designs. The goal is to be able to provide products that are rich in quality at low prices.

[0008]

[Means for Solving the Problems] A method for manufacturing a watch dial according to the present invention is a method for manufacturing a watch dial in which characters, etc. are fixed on a substrate of a watch dial that is decoratively plated or painted. , a step of compressing and transferring a band material such as brass or nickel silver material into a convex shape with a concave mold engraved with a reverse shape of a character or the like having a positioning guide hole in advance, and then polishing or cutting the convex surface to decorate it. The plating process, the process of fixing the convex surface with a peelable adhesive film, the process of cutting and removing the joint, the process of applying water-soluble pressure-sensitive adhesive to the back of the convex part, and decorative plating and painting. The peelable adhesive film is transferred and adhered onto a substrate of a watch face plate through a positioning guide hole, and the peelable adhesive film is removed.

[0009]

[Embodiments] Hereinafter, embodiments of the present invention will be explained in detail with reference to FIGS. 1, 2, and 3.

FIG. 1(a) is a plan view of a completed watch dial produced by the method of manufacturing a watch dial according to the present invention, and FIG.
FIG. 2 is a sectional view taken along cutting line AA'.

FIG. 2 is a plan view of a mold in which characters and the like having positioning guides are engraved in a reverse shape.

FIG. 3 is a cross-sectional view showing the manufacturing process of the present invention.

Corresponding to the completed plan view and cross-sectional view of the watch dial shown in FIG. 1, an inverted shape with letters and decorative patterns (circles) and positioning guide holes 6 for transfer and adhesion is made as shown in FIG. After engraving a concave shape with an NC engraving machine to a depth of about 0.1 to 0.6 mm on steel material for cold molds (SKS31) specified by JIS G4404, the required hardness (HRC61
A concave mold 7 was created which was heat-treated (quenched at 850°C for 45 minutes and then tempered at 180°C for 1 hour) to ensure the above).

Next, as shown in the enlarged sectional view of FIG. 3(a), the concave mold 7 is set in a friction press (100 tons), etc., and yellow steel, which has been softened to a hardness (HV=80 to 120) by heat treatment, is Band material such as nickel silver (t=0.1mm~0.6mm)
is compressed and transferred to form letters, etc. 4, which are convex parts with connecting parts 8, and after polishing or cutting the convex parts with a diamond or the like as shown in FIG. Decorative plating with gold, rhodium, etc.

[0015] Furthermore, as shown in Fig. 3(c), the convex portions such as letters 4 are coated with Hitalex L-3380 with an adhesive force of 250 g/25 m.
m (manufactured by Hitachi Chemical), fixed on a removable adhesive film 9,
As shown in Fig. 3(d), the connecting portion 8 is removed by cutting, etc., and a water-soluble 1548 90° initial peel adhesion depth 1300 g/25 mm (manufactured by ThreeBond) pressure sensitive adhesive 5 is applied to the back side of the letters 4. Apply by screen printing or the like to a thickness of about 30 μm and dry naturally.

Finally, as shown in FIG. 3(e), a watch dial substrate 1 is coated with decorative plating 2 of silver, gold, etc., and painting 3.
is set in a pasting jig having guide pins 10, and letters etc. 4 are transferred and adhered to the substrate 1 of the watch dial via the positioning guide hole 6, and can be peeled off by applying pressure at 0.3 to 5 kg/cm2. The adhesive film 9 was removed, and the watch dial shown in FIG. 1 was completed.

As described above, the characters, etc. 4 are accurately transferred to the peelable adhesive film 9 at the position of the substrate of the watch dial, and the letters, etc. 4 are pressure-sensitively bonded to the substrate of the watch dial. Since the adhesive strength of the agent 5 is stronger than that of the peelable adhesive film 9, transfer is possible.

[0018]

As explained above, according to the present invention, in a method for manufacturing a watch dial in which letters, etc. are fixed on a substrate of a watch dial that is decoratively plated or painted, a positioning guide is provided in advance. A step of compressing and transferring a band material such as brass or nickel silver material into a convex shape with a concave mold engraved with a reverse shape such as a letter with a hole, and then polishing or cutting the convex surface and decorative plating, Furthermore, a step of fixing the convex surface with a removable adhesive film, a step of cutting and removing the connecting portion, a step of applying a water-soluble pressure-sensitive adhesive to the back surface of the convex portion, a decorative plating,
It is characterized in that it is transfer-adhered onto the painted substrate of a watch dial through a positioning guide hole and the removable adhesive film is removed, allowing for three-dimensional characters with a wide variety of designs. This has the effect that it can be easily fixed to any position on the watch dial substrate.

As described above, the practical effects of the present invention are extremely large.

[Brief explanation of drawings]

1(a) is a completed plan view according to the manufacturing method of the present invention, and FIG. 1(b) is a sectional view taken along cutting line AA' in FIG. 1(a).

FIG. 2 is a plan view of a concave shape in which characters and the like having a positioning guide are engraved in a reverse shape.

FIG. 3 is a process sectional view showing the manufacturing process of the present invention. (a) is compression in a concave mold, transfer process (b) is polishing or cutting, and decorative plating process (c) is fixing to a removable adhesive film (d) is a process of cutting and removing the joint and applying pressure-sensitive adhesive. The coating process (e) is a process of transferring, pressing, and adhering to the watch dial substrate.

[
FIG. 4 is a sectional view of prior art 1.

FIG. 5 is a sectional view of Prior Art 2 and 3.

[Explanation of symbols]

1 Board 2 Decorative plating 3 Painting 4. Characters, etc. 5 Pressure sensitive adhesive 6 Positioning guide hole 7 type 8 Joint part 9 Peelable adhesive film 10 Guide pin 11 Resist film 12 Side sprunging 13 feet

Claims (1)

[Claims] Claim 1: A method for manufacturing a watch dial in which letters, etc. are fixed on a substrate of a watch dial that is decoratively plated or painted, in which a reverse shape of the letters, etc. is engraved in advance with positioning guide holes. A process of compressing and transferring a band material such as brass or nickel silver material into a convex shape using a concave mold, then a process of polishing or cutting the convex surface and decorative plating, and further applying a removable adhesive film to the convex surface. a step of fixing, a step of cutting and removing the connecting portion, a step of applying a water-soluble pressure-sensitive adhesive to the back surface of the convex portion, and a step of transferring and adhering the releasable adhesive onto the substrate through the positioning guide hole. A method for manufacturing a watch dial, comprising the step of removing a film.