Display member attachment method, dial, and timepiece

Abstract

To provide a mounting method of a display member for strengthening the fixing of the display member even if a first caulking tool for forming a recess is not deeply pushed in when the length of a metal pin is short.SOLUTION: A method for attaching a display member comprises a first step of preparing a display member having a metal pin and a dial plate having a through hole formed therein, and a second step of inserting the metal pin into the through hole after the first step. The method includes a second step of causing the end portion of the metal pin to protrude to the back surface side of the dial plate, a third step of deforming the metal pin such that the outer diameter of the metal pin is increased by forming a recessed portion in the end portion of the metal pin using a first caulking tool having a tip end with a first shape, and a fourth step of deforming the end portion such that the end portion is expanded to the back surface of the dial plate using a second caulking tool having a tip end with a second shape.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for attaching a display member, a dial, and a timepiece. [Background technology]

[0002] Patent Document 1 discloses a timepiece equipped with a dial on which a timepiece typesetting is installed. In Patent Document 1, with the metal pin of the timepiece typesetting inserted into a through-hole formed in the dial body, the protruding portion protruding from the back side of the dial body is plastically deformed with a crimping tool, and the deformed portion formed by the plastic deformation of the protruding portion is engaged with the back side of the dial body, thereby fixing the timepiece typesetting to the dial body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-164044 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, if the length of the protrusion is short, there is a risk that the fixing force will be insufficient. Furthermore, there is a problem that if the crimping tool is pushed in deeply to increase the fixing force, deformation may occur on the front side of the watch typesetting. [Means for solving the problem]

[0005] The method for attaching a display member disclosed herein is characterized by comprising: a first step of preparing a display member having a metal pin and a dial having a through hole formed therein; a second step, which is carried out after the first step, of inserting the metal pin into the through hole and causing an end of the metal pin to protrude toward the back surface of the dial; a third step, which is carried out after the second step, of deforming the metal pin so that its outer diameter expands by forming a recess in the end of the metal pin using a first crimping tool having a tip with a first shape; and a fourth step, which is carried out after the third step, of deforming the end so that it expands toward the back surface of the dial using a second crimping tool having a tip with a second shape.

[0006] The dial of the present disclosure is a dial to which a display member is fixed by crimping, the display member having a metal pin, a through hole formed in the dial, the metal pin being inserted into the through hole, the metal pin having a conical recess on the inside and a flat portion on the outside of the recess when viewed in a plan view from the back side of the dial, the flat portion being in close contact with the back side.

[0007] The timepiece of the present disclosure is characterized by having the above-described dial. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a timepiece according to a first embodiment. [Figure 2] FIG. 2 is a side view showing a main part of the dial of the first embodiment. [Figure 3] FIG. 3 is a side view showing a method for attaching the display member according to the first embodiment. [Figure 4] FIG. 3 is a side view showing a method for attaching the display member according to the first embodiment. [Figure 5] FIG. 3 is a front view showing a method for attaching the display member according to the first embodiment. [Figure 6] FIG. 3 is a side view showing a method for attaching the display member according to the first embodiment. [Figure 7] FIG. 3 is a front view showing a method for attaching the display member according to the first embodiment. [Figure 8]FIG. 10 is a side view showing a method for attaching the display member according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] A timepiece 1 according to a first embodiment of the present disclosure will now be described with reference to the drawings. 1 is a front view of the timepiece 1. In this embodiment, the timepiece 1 is configured as a wristwatch that is worn on the user's wrist. As shown in Figure 1, the watch 1 comprises an outer case 17, an hour hand 11, a minute hand 12, a second hand 13, a dial 14, a date wheel 16 that displays the date through a date window 15 formed in the dial 14, a display member 18, and a movement (not shown) that drives the hands 11 to 13 and the date wheel 16, all of which are housed within the outer case 17.

[0010] 2 is a side view showing a main part of the dial 14. In FIG. 2, the upper side is the back surface 142 side of the dial 14, and the lower side is the front surface 141 side of the dial 14. As shown in FIG. 2, the dial 14 is formed with a through-hole 143 that penetrates from the front surface 141 side to the back surface 142 side. The display member 18 is made of metal and includes a display portion 181 located on the surface 141 side of the dial 14 and a metal pin 182 protruding from the back side of the display portion 181 .

[0011] The display unit 181 is formed to have any shape as a typesetting for a watch, and is visible to the user from the front side of the watch 1 as shown in FIG. The metal pin 182 has a conical recess 183 provided on the inside and a flat portion 184 provided on the outside of the recess 183. In this embodiment, the recess 183 is formed so that the tip 185 does not extend beyond the back surface 142 of the dial 14 and is not positioned on the front surface 141 side. The flat portion 184 is configured to abut against the back surface 142 of the dial 14, more specifically, to be in close contact with the back surface 142 of the dial 14. The metal pin 182 may be formed integrally with the display unit 181, or may be configured to be attached to the display unit 181 by welding or the like.

[0012] [How to install the display parts] Next, a method for attaching the display member 18 will be described. 3 to 7 are diagrams showing a method for attaching the display member 18. FIG. 3, in a first step, a display member 18 having a metal pin 182 and a dial 14 having a through hole 143 are prepared. Then, in a second step, the metal pin 182 is inserted into the through hole 143, and the end of the metal pin 182 protrudes toward the back surface 142 of the dial 14.

[0013] 4, in the third step, a first crimping tool 20 having a cone-shaped tip 21 is used to form a recess 183 in the end of the metal pin 182. In this embodiment, the first crimping tool 20 has a cone-shaped tip 21, like a so-called center punch. This makes it easier to form the recess 183 in the end of the metal pin 182 in the third step.

[0014] In this case, as described above, in this embodiment, the recess 183 is formed at the end of the metal pin 182 so that the tip 185 of the recess 183 does not extend beyond the back surface 142 of the dial 14 toward the front surface 141 in a side view. As a result, the metal pin 182 is deformed so that its outer diameter expands, as shown in Fig. 5. The cone shape of the tip 21 of the first crimping tool 20 is an example of the first shape of the present disclosure.

[0015] Next, as shown in FIG. 6 , in the fourth step, a second crimping tool 30 having a columnar tip 31 is used to deform the end of the metal pin 182 so as to spread it out against the back surface 142 of the dial 14. As a result, as shown in FIGS. 6 and 7 , the tip of the metal pin 182 is spread out, and a flat portion 184 is formed outside the recess 183. In this embodiment, the second crimping tool 30 has a cylindrical tip 21 like a so-called parallel pin punch. This makes it easier to deform the end of the metal pin 182 so as to spread it out against the back surface 142 of the dial 14 in the fourth step.

[0016] As described above, the flat portion 184 abuts against the back surface 142 of the dial 14, more specifically, it is in close contact with the back surface 142 of the dial 14. In other words, the flat portion 184 is configured so that the surface facing the back surface 142 of the dial 14 abuts against the back surface 142 over the entire surface, thereby being in close contact with the back surface 142.

[0017] As described above, in this embodiment, in the third step, the first crimping tool 20 is used to form the recess 183 at the end of the metal pin 182, thereby deforming the metal pin 182 so that its outer diameter is expanded. Then, in the fourth step, the second crimping tool 30 is used to deform the end of the metal pin 182 so that it is pushed out toward the back surface 142 of the dial 14. By deforming the metal pin 182 in two steps, it is possible to form a flat portion 184 at the end of the metal pin 182 that abuts, or more specifically, is in close contact with, the back surface 142 of the dial 14. Therefore, when the metal pin 182 is short, the display member 18 can be firmly fixed without having to press the first crimping tool 20 deeply to form the recess 183.

[0018] Furthermore, in this embodiment, the tip 185 of the recess 183 is not positioned beyond the back surface 142 of the dial 14 toward the front surface 141, which makes it difficult for the display portion 181 of the display member 18 to deform. This makes it possible to prevent the appearance from being impaired by deformation of the display member 18.

[0019] [Effects of the first embodiment] According to the first embodiment, the following effects can be obtained. In this embodiment, by deforming the metal pin 182 in two stages, it is possible to form a flat portion 184 at the end of the metal pin 182 that abuts, more specifically, comes into close contact with, the back surface 142 of the dial 14. Therefore, when the length of the metal pin 182 is short, it is possible to firmly fix the display member 18 without having to deeply press the first crimping tool 20 to form the recess 183.

[0020] In this embodiment, the first crimping tool 20 has a conical tip 21, like a so-called center punch, which makes it easier to form the recess 183 in the end of the metal pin 182 in the third step.

[0021] In this embodiment, the second crimping tool 30 has a cylindrical tip 21, like a so-called parallel pin punch, which makes it easier to deform the end of the metal pin 182 so that it spreads out against the back surface 142 of the dial 14 in the fourth step.

[0022] In this embodiment, the tip 185 of the recess 183 is not positioned beyond the back surface 142 of the dial 14 toward the front surface 141, which makes it difficult for the display portion 181 of the display member 18 to deform. This makes it possible to prevent the appearance from being impaired by deformation of the display member 18.

[0023] [Second embodiment] Next, a method for attaching the display member 18A according to the second embodiment of the present invention will be described. The method of attaching the display member 18A in the second embodiment differs from that in the first embodiment in that in the third step, a recess 183A is formed at the end of the metal pin 182A so that the tip 185A of the recess 183A is positioned beyond the back surface 142 of the dial 14 toward the front surface 141 in a side view. In the second embodiment, the same or similar components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0024] Fig. 8 is a side view showing a method for attaching the display member 18A of the second embodiment, in which Fig. 8 shows the third step in the second embodiment. As shown in FIG. 8, in this embodiment, in the third step, a recess 183A is formed in the end of a metal pin 182A using a first crimping tool 20 having a cone-shaped tip 21. In this embodiment, the recess 183A is formed at the end of the metal pin 182A so that the tip 185A of the recess 183A is positioned beyond the back surface 142 of the dial 14 toward the front surface 141 in a side view.

[0025] Then, in the fourth step, similarly to the first embodiment described above, the second crimping tool 30 is used to deform the end of the metal pin 182 so as to spread it out against the back surface 142 of the dial 14 . Thus, in this embodiment, a recess 183A is formed at the end of the metal pin 182A so that the tip 185A of the recess 183A is positioned beyond the back surface 142 of the dial 14 toward the front surface 141, and then the end of the metal pin 182A is deformed so as to spread out toward the back surface 142 of the dial 14. By forming the recess 183A at the end of the metal pin 182A within a range that does not deform the display portion 181A of the display member 18A, it is possible to widen the range over which the end of the metal pin 182A spreads out toward the back surface 142 of the dial 14. This allows the display member 18A to be more firmly fixed.

[0026] [Effects of the first embodiment] According to the first embodiment, the following effects can be obtained. In this embodiment, by forming a recess 183A at the end of the metal pin 182A within a range that does not deform the display portion 181A of the display member 18A, it is possible to widen the range over which the end of the metal pin 182A presses against the back surface 142 of the dial 14. This makes it possible to more firmly fix the display member 18A.

[0027] [Variations] The present disclosure is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present disclosure. In each of the above-described embodiments, the tip 21 of the first crimping tool 20 has a conical shape, but this is not limiting. For example, the tip of the first crimping tool may have a pyramidal shape, and any shape that can form a recess in the end of the metal pin may be used.

[0028] In the above-described embodiments, the second crimping tool 30 has a cylindrical tip 31, but this is not limiting. For example, the second crimping tool may have a rectangular tip, as long as it has a shape that can deform the end of the metal pin so as to spread it against the back surface of the dial.

[0029] In the above-described embodiments, one metal pin 182, 182A is provided for each display unit 181, 181A, but this is not limiting. For example, multiple metal pins may be provided for each display unit. Each of the multiple metal pins may be fixed to the dial by the first to fourth steps described above, or one of the multiple metal pins may be fixed to the dial by the first to fourth steps described above.

[0030] In the above-described embodiments, the display members 18 and 18A are made of metal, but this is not limiting. For example, the display members may be configured by attaching metal pins to a display portion made of resin or the like.

[0031] In the above-described embodiments, the first crimping tool 20 having a conical tip 21 is used to form the recess 183, 183A at the end of the metal pin 182, 182A, and then the second crimping tool 30 having a columnar tip 31 is used to deform the end of the metal pin 182, 182A by pushing it outward toward the back surface 142 of the dial 14. However, this is not limited to this. For example, the end of the metal pin may be deformed using a crimping tool having a conical tip and a columnar, flat periphery. With this configuration, even with a single crimping step, the metal pin has a conical recess on the inside and a flat portion on the outside of the recess, and the flat portion can be in close contact with the back surface of the dial, thereby strengthening the fixation of the display member.

[0032] Summary of this disclosure The method for attaching a display member disclosed herein is characterized by comprising: a first step of preparing a display member having a metal pin and a dial having a through hole formed therein; a second step, which is carried out after the first step, of inserting the metal pin into the through hole and causing an end of the metal pin to protrude toward the back surface of the dial; a third step, which is carried out after the second step, of deforming the metal pin so that its outer diameter expands by forming a recess in the end of the metal pin using a first crimping tool having a tip with a first shape; and a fourth step, which is carried out after the third step, of deforming the end so that it expands toward the back surface of the dial using a second crimping tool having a tip with a second shape.

[0033] In the present disclosure, in a third step, a first crimping tool is used to form a recess in the end of the metal pin, thereby deforming the metal pin so that its outer diameter is expanded, and in a fourth step, a second crimping tool is used to deform the end of the metal pin so that it is pushed out toward the back surface of the dial. By deforming the metal pin in two steps, the end of the metal pin can be brought into contact with, or more specifically, into tight contact with, the back surface of the dial. Therefore, when the metal pin is short, the display member can be firmly fixed without having to press the first crimping tool deeply to form the recess.

[0034] In the display member mounting method of the present disclosure, the first shape may be a cone shape. This makes it easier to form a recess in the end of the metal pin in the third step.

[0035] In the display member mounting method of the present disclosure, the second shape may be a pillar shape. This makes it easier to deform the end of the metal pin so as to spread it out against the back surface of the dial in the fourth step.

[0036] In the method for attaching a display member disclosed herein, in the third step, the recess may be formed in the end of the metal pin so that, when viewed from the side, the tip of the recess does not extend beyond the back surface of the dial and is not positioned on the front surface side. This prevents the tip of the recess from extending beyond the back surface of the dial to the front surface, making it difficult for the front side of the display member to deform, thereby preventing the appearance from being marred by deformation of the display member.

[0037] In the method for attaching a display member disclosed herein, in the third step, the recess may be formed in the end of the metal pin so that, in a side view, the tip of the recess is positioned beyond the back surface of the dial and toward the front surface. By forming a recess in the end of the metal pin within a range that does not deform the front side of the display member, the area over which the end of the metal pin presses onto the back side of the dial can be increased, thereby making it possible to more firmly fix the display member.

[0038] The dial of the present disclosure is a dial to which a display member is fixed by crimping, the display member having a metal pin, a through hole formed in the dial, the metal pin being inserted into the through hole, the metal pin having a conical recess on the inside and a flat portion on the outside of the recess when viewed in a plan view from the back side of the dial, the flat portion being in close contact with the back side.

[0039] In the present disclosure, the metal pin, in a plan view from the back side of the dial, has a conical recess provided on the inside and a flat portion provided on the outside of the recess, and the flat portion is in close contact with the back side of the dial. As a result, the end of the metal pin has a flat portion that is in close contact with the back side of the dial, so the display member can be firmly fixed without making the recess deeper.

[0040] In the dial of the present disclosure, the tip of the recess does not have to be positioned beyond the back surface toward the front surface in a side view. This prevents the tip of the recess from extending beyond the back surface of the dial to the front surface, making it difficult for the front side of the display member to deform, thereby preventing the appearance from being marred by deformation of the display member.

[0041] In the dial of the present disclosure, in a side view, the tip of the recess may be located beyond the back surface toward the front surface. By forming a recess in the end of the metal pin within a range that does not deform the front side of the display member, the area over which the end of the metal pin presses onto the back side of the dial can be increased, thereby making it possible to more firmly fix the display member.

[0042] The timepiece of the present disclosure is characterized by having the above-described dial. [Explanation of symbols]

[0043] 1...clock, 11...hour hand, 12...minute hand, 13...second hand, 14...dial, 15...date window, 16...date wheel, 17...exterior case, 18, 18A...display member, 20...first crimping tool, 21...tip, 30...second crimping tool, 31...tip, 141...surface, 142...back, 143...through hole, 181, 181A...display section, 182, 182A...metal pin, 183, 183A...recess, 184...flat section, 185, 185A...tip.

Claims

1. A first step of preparing a display member having a metal pin and a dial having a through hole formed therein; a second step, which is carried out after the first step, of inserting the metal pin into the through hole and causing an end of the metal pin to protrude from the back side of the dial; a third step, which is carried out after the second step, of forming a recess in the end portion of the metal pin using a first crimping tool having a tip end with a first shape, thereby deforming the metal pin so that the outer diameter thereof is enlarged; a fourth step, which is carried out after the third step, of deforming the end portion by pushing it outward toward the back surface of the dial using a second crimping tool having a tip with a second shape. A method for attaching a display member.

2. The method for attaching a display member according to claim 1, The first shape is a cone shape. A method for attaching a display member.

3. The method for attaching a display member according to claim 1, The second shape is a pillar shape. A method for attaching a display member.

4. The method for attaching a display member according to claim 1, In the third step, the recess is formed in the end of the metal pin so that the tip of the recess does not extend beyond the back surface of the dial toward the front surface side in a side view. A method for attaching a display member.

5. The method for attaching a display member according to claim 1, In the third step, the recess is formed in the end of the metal pin so that the tip of the recess is positioned on the front side beyond the back side of the dial in a side view. A method for attaching a display member.

6. A dial plate to which the display member is fixed by caulking, The display member includes a metal pin, A through hole is formed in the dial, The metal pin is inserted into the through hole, The metal pin has a cone-shaped recess provided on the inside and a flat portion provided on the outside of the recess in a plan view seen from the back side of the dial, The flat portion is in close contact with the rear surface. A dial characterized by

7. 7. The dial according to claim 6, When viewed from the side, the tip of the recess does not extend beyond the back surface and is positioned on the front surface side. A dial characterized by

8. 7. The dial according to claim 6, When viewed from the side, the tip of the recess is located on the front surface side beyond the back surface. A dial characterized by

9. A dial according to any one of claims 6 to 8 is provided. A watch characterized by

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