JPH075272A - Clock display switching mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] Instantly switch to the afternoon display at 12:00 in the daytime. [Structure] By the action of the hour wheel 10 and the intermediate wheel 12, 1 a day
A cam pin 28 is provided on the side edge of the operating hole 24 of the rotating operating wheel 14.
Since the cam 26 rotates in the state of contacting with, the cam 26 also rotates clockwise once a day. In the morning, the lever 30 is in contact with the long diameter side of the cam 26, but at 12:00 noon, the lever 30 reaches the transition point where the long diameter of the cam 26 changes to the short diameter. When the cam 26 further rotates in the direction of the arrow FB, the lever 30 instantaneously shifts from the long diameter position of the cam 26 to the short diameter position by the action of the spring 34. This displacement of the lever 30 is transmitted to the movable dial plate 36 by the tooth portion 31 and the switching groove 39 at the tip, and the movable dial plate 36 is indicated by the arrow F.
Since it rotates in the C direction by a predetermined angle, the time display can be instantly switched to the afternoon display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display switching mechanism for switching the time display of a clock depending on whether it is AM or PM.

[0002]

2. Description of the Related Art As a display switching mechanism for a timepiece, particularly a wristwatch, there is a display switching timepiece disclosed in Japanese Utility Model Laid-Open No. 63-187088. According to this conventional example, a display operation pin that rotates once a day is provided with a display operation pin, and this is engaged with a display switching window provided on the display plate. When the operating pin makes one rotation within the display switching window, the display plate reciprocates by a predetermined angle. As a result, the morning display and the afternoon display are switched.

However, in such a conventional technique, the jump control spring is displaced along the tooth portion provided on the inner peripheral side of the display plate, and the jump control spring moves over the tooth portion from morning to afternoon and It is performed when the display is switched from afternoon to morning. Therefore, when the display is switched, both the morning display of 1 to 12 and the afternoon display of 13 to 24 are slightly displayed on the dial window, which makes it difficult to determine the time.

By the way, when the display is switched from the afternoon display to the morning display, the user is usually sleeping, and it is not so inconvenient if the display is switched slowly. However, when switching from the morning display to the afternoon display, it is preferable that the switching be performed promptly. The present invention focuses on these points, and an object thereof is to provide a convenient display switching mechanism for a timepiece, which can instantly switch from the morning display at 12:00 in the daytime to the afternoon display. To do.

[0005]

In order to achieve the above-mentioned object, the present invention reciprocates a movable dial having a predetermined number of hour characters alternately arranged on the outer periphery for a morning display and an afternoon display by a predetermined amount. In the display switching mechanism of the clock that switches between morning display and afternoon display that can be seen through the dial window by exercising, the working wheel that rotates once a day via the hour wheel, and the working wheel that engages with this working vehicle. With a fan-shaped cam that rotates with
A lever that reciprocates a predetermined amount by a spring acting in conjunction with the rotation of the cam and a switching groove provided on the inner peripheral side of the movable dial for engaging and reciprocating the lever are provided. It is characterized in that, when switching from the morning display to the afternoon display, the lever is urged by the spring to shift from the long diameter side to the short diameter side of the cam.

[0006]

According to the present invention, the fan-shaped cam also rotates once a day as the working wheel transmitted from the hour wheel rotates. A lever urged by a spring is always in contact with this cam,
This lever reciprocates corresponding to the fan shape of the cam. This reciprocating motion corresponds to the difference between the long diameter and the short diameter of the cam. Since the movable dial is engaged with the lever, the movable dial also reciprocates similarly. The amount of rotation and the position of the movable dial at this time are determined according to the reciprocating movement of the lever. When the display is changed from the morning display to the afternoon display, the lever moves while being biased by the spring from the long diameter side of the cam to the short diameter side, so that the rotation of the movable dial is instantaneously performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a timepiece display switching mechanism according to the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a main sectional view of this embodiment, and FIG. 2 shows a main plan view. In these drawings, an intermediate wheel 12 meshes with the hour wheel 10 at the center of the timepiece, and an operating wheel 14 meshes with this intermediate wheel 12.
The number of teeth of the hour wheel 10, the intermediate wheel 12, and the operating wheel 14 are adjusted so that the operating wheel 14 rotates clockwise once a day. The rotary shaft 18 of the intermediate wheel 12 is continuous with the main plate 16, and the rotary shaft 20 of the actuating wheel 14 is fixed to the main plate 16 with screws 22.

Next, the operation wheel 14 is provided with an operation hole 24, and a cam 26 is fixed to the rotary shaft 20 thereof. A cam pin 28 provided on the cam 26 projects into the operating hole 24. That is, the operating vehicle 1
With the clockwise rotation of 4, the side edge of the actuating hole 24 abuts on the cam pin 28, whereby the cam 26 rotates in the same clockwise direction.

Next, the lever 30 is in contact with the cam 26. The lever 30 is rotatable about a shaft 32, but is apt to rotate in the clockwise direction by a spring 34. The lever 30 is in contact with the long diameter side of the cam 26 as shown in FIG. 2 (A), and in a state of being in contact with the short diameter side of the cam 26 as shown in FIG. 2 (B). It is configured to reciprocate between states.

On the other hand, a movable dial plate 36 is provided on the outer peripheral side of each of the above-mentioned mechanisms, and is movable by a movable dial plate retainer 38 so as to be swingable around the hour wheel 10 toward the main plate 16 side. On the outer circumference of the movable dial plate 36, hour characters of 1 to 24, which are characters indicating the time, are provided. Among these hour characters, the letters 1 to 12 indicating the time of the morning and the letters 13 to 24 indicating the time of the afternoon are arranged alternately. A switching groove 39 is formed at the tip of the lever 30 on the inner peripheral side of the movable dial plate 36, and the tooth portion 31 at the tip of the lever 30 is engaged with the switching groove 39. . That is, when the tooth portion 31 acts on the switching groove 39, the movable dial plate 36 is configured to reciprocate in the clockwise and counterclockwise directions as the lever 30 reciprocates.

Next, the dial 40 on the front side of the timepiece has 12
The individual dial window 42 is formed at equal intervals on the circumference corresponding to the hour character. From these dial windows 42, 1-1
By changing the characters that can be seen from the dial window 42, such as when the character 2 is visible in the morning and when the characters 13 to 24 are visible, the display can be switched between am and pm. ing.

Next, the operation of this embodiment will be described with reference to FIGS. 3 and 4. As described above, the hour wheel 1
The working wheel 14 rotates once a day by the action of the intermediate wheel 12. At this time, the actuating hole 24 of the actuating wheel 14 rotates with the cam pin 28 in contact with the side edge of the actuating wheel 24, so that the cam 26 also rotates clockwise once a day. Figure 2 in the morning
As shown in (A), the lever 30 is in contact with the long diameter side of the cam 26. In FIG. 4A, the time display of the clock in the morning is shown, and the hour characters 1 to 12 are visible from the dial window 42 of the dial 40.

When the time further advances from such a state, the cam 26 further rotates clockwise. Then, at 12:00 noon, the lever 30 reaches the transition point where the cam 26 moves from the major axis to the minor axis, as shown in FIG. 3A from the state of FIG. 2A. As described above, the spring 34 has the arrow FA.
The lever 30 is biased as indicated by. Therefore, when the cam 26 further rotates in the arrow FB direction, the lever 30 instantly shifts from the long diameter position of the cam 26 to the short diameter position. As a result, the tooth portion 31 at the tip of the lever 30 instantly shifts in the direction of the arrow FC by a predetermined amount (difference between major axis and minor axis).

The tooth portion 31 is engaged with the switching groove 39 of the movable dial plate 36 as described above. Therefore, the movable dial plate 36 rotates in the direction of the arrow FC by a predetermined angle, as shown in FIG. 2 (B). By these operations, the time display becomes the afternoon display as shown in FIG. That is, from the dial window 42 of the dial 40 to 13-2
You will be able to see the hour 4 character.

Next, in the afternoon, as shown in FIG.
The lever 30 is in contact with the minor diameter side of the cam 26, and the time display of the timepiece is as shown in FIG. 4 (B). When the time further advances from such a state and the cam 26 further rotates in the clockwise direction and becomes 24:00 (12:00 pm, midnight) at midnight, the state of FIG. 2 (B) is changed to that of FIG. 3 (B). As shown, the lever 30 reaches the transition point where the cam 26 transitions from the minor axis to the major axis. As described above, the spring 34 has the arrow F.
As shown by A, the lever 30 is biased. For this reason,
When the cam 26 further rotates in the direction of arrow FB, the lever 30
Will gradually move from the short diameter position of the cam 26 to the long diameter position.

Therefore, the tooth portion 31 at the tip of the lever 30 gradually moves in the direction of the arrow FD by a predetermined amount. Then, the movable dial 36 rotates in the arrow FD direction by a predetermined angle. By these operations, the time display becomes the morning display as shown in FIG. That is, from the dial window 42 of the dial 40 to 1
You will be able to see the 12 hour mark.

As described above, according to this embodiment, the lever is driven by utilizing the long diameter and the short diameter of the fan-shaped cam, and when the display is changed from the morning display to the afternoon display, the lever is moved in the biasing direction by the spring. Since it is decided to exercise, it is possible to instantly perform switching at 12:00 in the daytime. by this,
The time can be easily confirmed and usability is improved.

The present invention is not limited to the above-described embodiments. For example, although the above-mentioned embodiments apply the present invention to a wristwatch, the present invention is also applicable to other timepieces. Further, various design changes can be made so that the concrete shapes of the respective parts of the switching mechanism shown in the above-mentioned embodiment can achieve the same effect.

[0019]

As described above, according to the display switching mechanism of the timepiece of the present invention, the movable dial is reciprocated by the action of the cam and the lever urged by the spring. The display can be switched instantaneously during the daytime, and during the daytime (daytime), the display of am or pm can always be favorably seen from the dial window, which is convenient.

[Brief description of drawings]

FIG. 1 is a main sectional view showing an embodiment of a display switching mechanism of a timepiece according to the present invention.

FIG. 2 is a main plan view of the embodiment.

FIG. 3 is an explanatory diagram showing movements of a cam and a lever when switching between morning and afternoon.

FIG. 4 is an explanatory diagram showing time display in the morning and afternoon.

[Explanation of symbols]

 10 ... Cylindrical wheel 12 ... Intermediate wheel 14 ... Actuating wheel 16 ... Main plate 18 ... Rotating shaft 20 ... Rotating shaft 22 ... Screw 24 ... Actuating wheel operating hole 26 ... Cam 28 ... Cam pin 30 ... Lever 31 ... Tooth portion, 32 ... Shaft 34 ... Spring 36 ... Movable dial plate, 38 ... Movable dial plate retainer 39 ... Switching groove 40 ... Dial plate 42 ... Dial plate window

Claims (1)

[Claims] 1. A morning display and a afternoon display seen from a dial window by reciprocating a predetermined amount of a movable dial having a plurality of hour characters alternately arranged on the outer periphery corresponding to the morning display and the afternoon display, respectively. In a display switching mechanism of a timepiece for switching the display, an operating wheel that rotates once a day via a hour wheel, a fan-shaped cam that engages with the operating wheel and rotates, and the rotation of this cam Equipped with a lever that performs a predetermined amount of reciprocating motion that is acted by a spring, and a switching groove that is provided on the inner peripheral side of the movable dial to engage and reciprocate with this lever. The display switching mechanism of the timepiece is characterized in that the lever is biased by the spring so as to shift from the long diameter side to the short diameter side of the cam when switching to.