JPH0210475Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dial plate structure for a pointer display type timepiece with a calendar.

[Background of the idea]

In recent years, pointer display watches with calendars have become thinner,
The demand for miniaturization is becoming higher and higher due to emphasis on fashionability, and we have reached the stage where we are pursuing the ultimate in miniaturization and thinning of mounted electronic components, as well as improvements in component processing technology. Under these circumstances,
Conventionally, various calendar-equipped pointer display type watches have been invented and devised, and the date plate, which constitutes the calendar mechanism,
Various studies have been made regarding the relationship between a calendar display member such as a day plate and a dial receiving plate that receives a dial plate.

A typical conventional structure is shown in FIGS. 1 and 2. FIG. 1 is a plan view showing the dial plate structure of a conventional calendar-equipped pointer display type watch, and FIG. 2 is a cross-sectional view of the main part of FIG. A dial receiving plate 2 is provided, and each of the hook portions 2a of the dial receiving plate 2 is engaged with a notch portion of the watch base 1.

Further, the dial plate receiving plate 2 is made of plastic material, and there are four hook portions 2 formed on the side of the watch base 1.
a are engaged with the lower surface portion 1b of the watch base 1 and fixed to the watch base 1. Two fixed legs 3a
The dial 3 (omitted in the plan view) on which is formed is mounted on the upper surface 2b of the dial receiving plate 2, and the fixing feet 3a are inserted into the dial positioning holes 2c and 2c formed on the dial receiving plate 2. The dial plate 3 is fixed by passing through the hole 1c of the watch base 1 and fitting into the dial fixing member 4 disposed on the lower surface side of the watch base 1. In addition, the date plate 5 and day plate 6, which are calendar display members, are arranged parallel to the dial 3 with a gap of 100 to 200 μm from the lower surface 3b of the dial 3, and furthermore, the outer peripheral part 5a of the date plate 5 is The inner periphery 2d of the dial plate receiving plate 2 and the outer periphery 6a of the day plate 6 are each 200 mm larger than the inner periphery 5b of the date plate 5.
They are arranged with a gap of ~300 μm. The distance l between the outer periphery 2e and the inner periphery 2d of the dial receiving plate 2 is determined by the relationship between the diameter of the dial positioning hole 2c and the remaining thickness around it, and is determined by taking into account moldability, component strength, warping, etc. When the remaining meat is set, the distance l is 1600~
It becomes 1800μm. Therefore, the outer diameter of the date plate 5 becomes considerably smaller than the outer diameter of the clock base 1, the date characters printed on the upper surface 5c of the date plate 5 also become smaller, and the day plate 6 also becomes smaller accordingly. When the timepiece is made smaller, the calendar display member becomes considerably smaller, which causes problems such as the date, day of the week, etc. becoming difficult to see.

[Purpose of invention]

It is an object of the present invention to provide a structure for a pointer display type timepiece that eliminates the drawbacks of the above-mentioned prior art and allows the calendar display member to be enlarged even when the timepiece is downsized.

[Example of idea]

Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 3 is a plan view of a pointer display type watch with a calendar showing an embodiment of the present invention, with the date plate and day plate seen from the top side, and Fig. 4 is the top view of the date plate and day plate shown in Fig. 3. FIG. 5 is a cross-sectional view of the main part when the dial is placed on the side, and FIG. 5 is a cross-sectional view taken along the line AA in FIG. 3.

In FIGS. 3 and 4, reference numeral 1 denotes a watch base, and a ring-shaped dial receiving plate 2 is disposed on the outer circumferential upper surface 1a, and each of the hook parts 2a of the dial receiving plate 2 is a watch base. It engages with a notch in the base 1. Further, the dial plate receiving plate 2 is made of a plastic material, and each of the four hook portions 2a formed on the watch base 1 side of the dial plate receiving plate 2 engages with the lower surface portion 1b of the watch base 1. It is fixed to base 1. Reference numeral 3 denotes a dial plate on which two fixed feet 3a are formed, and is mounted on the upper surface portion 2b of the dial plate receiving plate 2. Dial plate 3 has fixed foot 3
a passes through the dial positioning hole 2c formed in the dial receiving plate 2 and the hole 1c in the watch base 1, and is fitted into the dial fixing member 4 disposed on the lower surface side of the watch base 1. It has been fixed. The date plate 5 and day plate 6, which are calendar display members, are arranged parallel to the dial 3 with a gap of 100 to 200 μm from the lower surface 3b of the dial 3, and furthermore, the outer peripheral part 5a of the date plate 5 is The inner peripheral part 2d of the plate receiving plate 2 and the outer peripheral part 6a of the day plate 6 are arranged with a gap of 200 to 300 μm from the inner peripheral part 5b of the date plate 5, respectively. Further, a ring-shaped thin ring portion 2f is formed on the dial plate receiving plate 2 with a gap such that it does not come into contact with the date plate 5. This thin ring portion 2f is narrow in width and is an effective means for improving moldability when molding the relatively thin ring-shaped dial receiving plate 2. In order to increase the size of the outer periphery 2 of the dial plate 2,
Even if the distance l between e and the inner peripheral part 2d is small, the moldability is good for reasons described later, so deformations such as warping can be controlled to a certain level, and furthermore, the thin ring part 2f is formed over the entire circumference. Therefore, the strength of the parts can be maintained at a level that does not cause any performance problems.

The distance l between the outer periphery 2e and the inner periphery 2d of the dial support plate 2 is determined by the fixed foot 3a of the dial 3 in consideration of impact resistance, etc.
It is necessary to ensure a certain degree of wall thickness between the outside of the dial plate 2 and the outer circumference 2e of the dial plate 2. However, since there is a thin ring part 2f between the dial positioning hole 2c through which the fixed foot 3a passes, and the inner peripheral part 2d of the dial plate 2, there is a thin ring part 2f. There is no problem even if the inner circumferential part 2d and the dial positioning hole part 2c through which the fixed foot 3a passes are brought into substantially contact with each other in a plane, and the wall thickness is not ensured. Shock resistance here refers to the quality of the watch when it is dropped or collided with something while being carried around.
It means performance.

However, the area around the fixed foot 3a of the dial plate 3 is
As mentioned above, since the wall thickness is small and the strength is not sufficiently ensured, the dial 3 may move due to impact such as being dropped, and the hour hand ( Since there is a risk that parts may be damaged due to contact with the hour wheel 7 (not shown) attached thereto, two convex portions 2g as shown in FIG. 5 are formed on the dial receiving plate 2. The convex portion 2g is formed in the vicinity of the dial positioning hole portion 2c and is connected to the fitting portion 1 of the watch base 1.
It is a light pressure fit with d. Due to the impact, the dial 3
When the fixing foot 3a is deformed and comes into contact with the side surface of the dial positioning hole 2c, and a force that deforms the dial receiving plate 2 is applied, the fixing foot 3a is engaged with the fitting part 1d of the watch base 1. The convex portion 2g is the dial receiving plate 2.
This function works to prevent deformation of the dial plate 3, reduce movement of the dial plate 3, and prevent damage to parts.

Further, the convex portion 2g has a hollow structure for the following reasons, including stabilizing the fitting force with the watch base 1. The dial plate receiving plate 2 is made of plastic material and has a ring shape with nothing in the center, so the positioning accuracy of the convex part 2g is insufficient. Misalignment with the fitting portion 1d of the watch base 1 occurs. Therefore, the convex portion 2
If the convex part 2g is not made hollow when pushing the convex part 2g into the fitting part 1d, the side surface of the convex part 2g will be scraped, making it impossible to stabilize the fitting force. When the hollow structure is used, the margin of the convex portion 2g escapes into the hollow portion, and the side surfaces of the convex portion 2g are not cut. In addition, since watches are regularly disassembled and assembled, the convex portion 2g and the fitting portion 1d of the watch base 1 must be fitted with light pressure to prevent damage when removing the dial plate 2. In addition, it is necessary to ensure a stable fitting force even after repeated installation and removal, so the convex portion 2g needs to have a hollow structure.

In addition, since the convex portion 2g is formed near the dial positioning hole 2c, the fitting portion 1d of the watch base 1 and the convex portion 2g fit together to form the dial positioning hole 2c with high accuracy. Hole 1c of clock base 1
Since the hole positions are almost the same, the dial plate 3 can be installed stably.

As described above, by providing the thin ring portion 2f on the inner peripheral portion 2d of the dial receiving plate 2 and forming the convex portion 2g near the dial positioning hole portion 2c, the outer circumference of the dial receiving plate 2 is The distance 1 between the portion 2e and the inner peripheral portion 2d becomes considerably small, allowing the date plate and day plate to be made larger, and the dial plate receiving plate 2 to be stably fixed to the watch base 1.

FIG. 6 is a plan view showing another embodiment, and FIG. 7 is a sectional view of the main part of FIG. 6.

In FIGS. 6 and 7, the day plate 6 is arranged parallel to the upper surface of the date plate 5 with a gap of 100 to 200 μm, and the outer periphery 6a of the day plate 6 is connected to the dial receiving plate 2. It is arranged with a gap of 200 to 300 μm from the inner peripheral portion 2d. The date characters printed on the upper surface 5c of the date plate 5 can be seen through the opening 6d of the day plate 6, and the date window (not shown) formed in the dial 3 is visible through the opening 6d. set to the position. Fixing structure of dial plate receiving plate 2, position and shape of convex portion 2g formed around dial positioning hole 2c, dial plate 3
The fixing structure and the like are set under the same conditions as in the previous embodiment.

As mentioned above, based on the outer diameter size of the date plate 5, the day plate 6
Even on watches with a larger outer diameter, the date plate,
It is possible to increase the size of the day board.

In this embodiment, only a structure in which the dial positioning hole and the inner peripheral part of the dial plate are in contact with each other is shown, but the present invention is not limited to this, and the dial positioning hole and the dial plate This effect is also exhibited when the inner peripheral portion is polymerized.

In the embodiments shown in FIGS. 3 to 5, 6, and 7, the convex portion 2g is fitted to the watch base 1, but the invention is not limited to this, and the fixing foot 3 of the dial
Even if a is fitted into the dial positioning hole 2c and the hole 1c, sufficient impact resistance is maintained as in the embodiment.

[Effect of idea]

As is clear from the above embodiments, according to the present invention, the thin ring part is formed in a ring shape inside the dial receiving plate, so that the dial positioning hole and the inner peripheral part of the dial receiving plate are connected. By substantially contacting or overlapping, the distance between the outer circumferential portion and the inner circumferential portion of the dial plate can be set to be much smaller than in the past. As a result, the outer diameters of the date plate and day plate have become larger, allowing for larger dates and days of the week to be printed than before, making it possible to commercialize wristwatches with calendars that are easy to read even when watches such as women's watches are downsized.

In addition, even in a structure where the date plate is on the bottom side of the date plate, there is no need to attach a lens to the windshield glass fixed to the watch case to make the date plate easier to see, and the structure of the watch case can be simplified, which reduces the cost of the watch. Now it's possible to go down. Furthermore, we were able to achieve great effects by eliminating design constraints. Furthermore, if the dial receiving plate is provided with a convex portion that fits into the watch base, positioning accuracy and impact resistance can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the structure of a dial plate according to the prior art, Fig. 2 is a sectional view of a main part of Fig. 1, and Figs. 3 to 5 are a dial plate according to an embodiment of the present invention. FIG. 3 is a plan view, FIG. 4 is a sectional view of main parts, FIG. 5 is an AA sectional view of FIG. 3, and FIGS. 6 and 7 are dial plates according to other embodiments. The structure of the receiving plate is shown, with FIG. 6 being a plan view and FIG. 7 being a sectional view of the main part. 1...Watch base, 1d...Fitting part, 2...Dial plate receiving plate, 2a...Hook part, 2c...Dial positioning hole part, 2d...Inner circumference part, 2e...Outer circumference part, 2
f...Thin ring portion, 2g...Convex portion, 3...Dial plate, 3a...Fixed foot, 5...Date plate, 6...Day plate.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of dial positioning holes for positioning the fixed feet of the dial and a plurality of hooks for engaging with the watch base are formed. In the ring-shaped dial receiving plate structure, a thin ring portion is provided continuously on the inner periphery of the dial receiving plate, and the dial positioning hole portion is flush with the inner periphery of the dial receiving plate. A dial plate structure of a pointer display type watch characterized by substantially touching or overlapping. (2) The character of the pointer display type timepiece as set forth in claim 1 of the utility model registration claim, characterized in that a convex portion that fits into the watch base is provided in the vicinity of the dial positioning hole of the dial receiving plate. Plate receiving plate structure.