JPH04238290A - Manufacture of nameplate for wrist watch - Google Patents

Abstract

PURPOSE:To obtain a dial with new design by changing color of the top surface from color of the side surface of projecting parts such as letter marks or the like of the dial for wrist watch. CONSTITUTION:A surface pattern is formed on a dial base by mechanical processing, and plating is performed at need, and coating is performed thereon to form a non-conductive film layer, and thereafter, parts of letters, abbreviations, and marks or the like are projected, and the only part of the side surface of the projecting parts, where a conductive base metal layer is exposed, is electrodeposition coated with the conductive thermosetting coating, and furthermore, the top surface of projecting letters, abbreviations and marks or the like are colored.

Description

[Detailed description of the invention]

0001

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

0002

BACKGROUND OF THE INVENTION Conventionally, dials for wristwatches have been made by applying radial or vertical grains to fabric, plating or painting the cloth, and then planting letters on top. Although this method allows a three-dimensional dial to be obtained, the disadvantage is that the characters are made separately and then embedded into the base, which requires a large number of processing steps and increases costs.

[0003] As a method to save the trouble of embedding characters, a surface pattern is formed by machining on the dial base, the parts that will become the characters are made to protrude using a mold, and the characters are made by cutting these protrusions with a diamond cutting tool or the like. There is a method of creating a shape and then plating the letters as needed to create a dial. (Hereinafter referred to as the WD method.) However,
The dials produced using the WD method also had mostly simple finishes, with the characters mainly being plated.

0004

[Problems to be Solved by the Invention] The present invention allows characters, abbreviations, marks, etc. on a wristwatch dial to be easily formed by the WD method, and moreover, by changing the color tone of the side and top surfaces of the characters, abbreviations, marks, etc. , which aims to expand the variety of designs and produce dials at low cost with a short lead time.

[0005]

[Means for Solving the Problems] The present invention involves forming a surface pattern on a dial base by machining, plating if necessary, and coating the pattern to form a non-conductive film layer, and using the WD method. Make characters, abbreviations, marks, etc. stand out. By protruding the sides of the protruding characters, abbreviations, marks, etc., a shearing force is applied, and the underlying metal layer is exposed. A conductive thermosetting paint is electrodeposited on the side surface where the conductive base metal layer is exposed, and a conductive coating layer is formed only on the side surface of the protruding portion to give it color. The upper surface of protruding characters, abbreviations, marks, etc. can be further colored by printing or the like.

[0006] Brass, nickel silver, etc. are usually used as the material for the dial base. The resin to be painted is usually a thermosetting resin such as acrylic resin or epoxy resin, which is applied by spray painting or the like and heated to form a paint layer. A conductive thermosetting paint is electrodeposited on the exposed metal surface of the side surface of the protruding part of the non-conductive paint layer, but in the present invention, cationic epoxy resin, acrylic resin, etc. are used as the paint. did. By mixing fine metal powder into the paint, it is also possible to give the electrodeposition coating layer a metallic luster.

[0007] For electrodeposition painting, the dial base is degreased and cleaned,
Immerse it in a solution containing an electrodeposition coating solution, use the dial base as the cathode and the stainless steel plate as the anode, and apply 50 to 15 minutes between the two electrodes.
This can be obtained by applying 0V direct current for 1 to 3 minutes, and the electrodeposition paint is applied only to the side surfaces of the protruding portions from which the non-conductive coating layer has been removed. Next, after cleaning, it is heated and cured to form an electrodeposition coating layer.

[0008] The upper surface of the protruding characters, abbreviations, marks, etc. can be further colored by printing or the like.

[0009]

[Operation] Through the above steps, only the sides of characters, abbreviations, marks, etc. formed three-dimensionally on the dial plate can be easily colored.

0010

EXAMPLES The present invention will be explained in detail with reference to Examples below. FIG. 1 is a sectional view of a wristwatch dial according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing each step of a method for manufacturing a wristwatch dial according to the first embodiment. (A) The dial base 1 was formed from a brass plate with a thickness of 0.3 mm, and was given a radial basis weight. After applying nickel plating and silver plating on the dial base 1, a clear coating was applied to form the coating layer 2. (B) The part that should be an abbreviation was made to protrude by the mold. The coating layer 2 is removed from the sheared surface of the protruding portion, and the metal surface is exposed. (C) This dial plate is immersed in an electrodeposition coating liquid made of a cationic acrylic electrodeposition coating resin containing a black pigment, and while stirring the electrodeposition coating liquid, the dial plate is used as a cathode and the stainless steel plate is A direct current of 100 V was applied between the two electrodes for 1 minute using the anode. Next, this dial plate was heated in a heating furnace at 150° C. for 20 minutes to cure the electrodeposited coating film, thereby forming an electrodeposition coating layer 3.

Furthermore, a blue printing layer 4 was formed on the upper surface of the protruding abbreviations. It was possible to make the sides of the abbreviations protruding from the silver dial surface black and the top surface blue. Gold, gray, or other color plating can also be used as the plating layer on the dial surface. The color tone of the electrodeposition coating resin can be white or other colors by changing the pigment.

Next, a second embodiment of the present invention will be explained. (A) A radial basis weight was applied to the dial base 1 and nickel plating was applied. A white coating was applied on the plating layer to form coating layer 2. (B) The part that should be an abbreviation was made to protrude by the mold. The coating layer 2 is removed from the sheared surface of the protruding portion, and the metal surface is exposed. (C) This dial plate is immersed in an emulsion type electrodeposition coating liquid in which cationic acrylic electrodeposition coating resin and fine silver powder are dispersed in purified water, and while stirring the electrodeposition coating liquid, the dial plate is was used as a cathode, and a stainless steel plate was used as an anode, and electrodeposited and cured under the same conditions as in the first example to obtain an electrodeposited coating layer 3.

Furthermore, a black printing layer 4 was formed on the upper surface of the protruding abbreviations. It was possible to create abbreviations on a white dial surface with silver sides and black tops. In addition to the silver mentioned in this example, gold,
Copper, nickel, etc. can be used.

[0014]

[Effects of the Invention] As described in the embodiments above, according to the present invention, the characters, abbreviations, etc. on the dial of a wristwatch can be easily made three-dimensional and the side and top surfaces can be made in different colors, thereby creating unique characters. You can get a board. In addition, even thin letters can be precisely formed, expanding the variety of designs.
It can be produced at a low cost with a short lead time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a wristwatch dial according to the present invention.

FIGS. 2A to 2D are cross-sectional views showing each step of the method for manufacturing a wristwatch dial according to the present invention.

[Explanation of symbols]

1 Dial base 2 Paint layer 3 Electrodeposition coating layer 4 Printing layer

Claims (2)

[Claims] Claim 1: After forming a non-conductive film layer on the dial base by painting, parts such as letters, abbreviations, marks, etc. are made to protrude using a mold, and the side surfaces of the protruding parts such as letters, abbreviations, marks, etc. are sheared to form a base layer. The feature is that conductive paint is electrodeposited on the exposed surface of the metal layer to form a conductive coating layer only on the side surfaces of the protruding parts, and the upper surfaces of protruding letters, abbreviations, marks, etc. are colored. A method for manufacturing a watch dial. 2. The method of manufacturing a wrist watch dial according to claim 1, wherein the color tone of the side surface and the color tone of the top surface of the protruding characters, abbreviations, marks, etc. are changed.