JP2003202386A - Calendar feed mechanism of hand type timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress skip of date plate due to external shock force even with enlarging the date plate diameter. <P>SOLUTION: A calendar feed mechanism of a hand type timepiece comprises a day wheel 5 driven by a hand driving wheel series for driving hands, a date plate 1 fed by a nail 5a formed to the day wheel 5, a calendar back plate 2 guiding the tooth 1a formed inside the date plate 1, a jump regulation lever 4 for hooking the tooth 1a of the date plate 1 and regulating the position of the date plate 1 in the rotation direction and a correction mechanism for correcting the indication on the date plate 1. In a part of the outer part (guide) 2a of the calendar back plate 2, a notch 2b is provided in the direction facing to normal rotation direction (arrow A) of the date plate 1. The shape of the tip end of the jump regulation lever 4 has a normal rotation direction regulation surface 4a and a reverse rotation direction regulation surface 4b. The reverse rotation direction regulation surface 4b is formed so as to be perpendicular to the center of boss 10 rotatably bearing the jump regulation lever 4. Owing to a large diameter date plate, the date indication is easy to see and skip of the data plate is avoidable. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calendar feeding mechanism for a pointer type timepiece.

[0002]

2. Description of the Related Art Conventionally, as a multifunctional wristwatch, the calendar month,
There are things on the market that represent the days and days of the week and the shape changes of the phases of the moon. In these general display methods, the necessary information is printed and displayed on the surface of the moon plate, date plate, day plate, picture board that shows the shape change of the moon, etc. It is designed to be displayed through a through window arranged in the.

FIG. 3 is a plan view of a timepiece that displays the date using a conventional general date dial as seen from the dial side, and FIG. 4 is
It is a principal part top view of FIG. In FIGS. 3 and 4, reference numeral 1 denotes a date plate, which is made of a relatively lightweight member such as aluminum or plastic, and a continuous number from 1 to 31 corresponding to 31 days is provided on the outer peripheral portion of the surface of the date plate 1. It is printed. As many as 31 teeth 1a are formed on the inner peripheral side of the date plate 1, and are guided by the outer peripheral part 2a of the calendar back plate 2 placed on the base plate (not shown). An appropriate gap is provided between the tips of the teeth 1a of the date dial 1 and the outer peripheral portion 2a of the calendar back plate 2 so that the date dial can smoothly rotate. The date dial 1 is mounted on the main plate so as to be concentric with the center of the clock, which is the rotation center of the pointer wheel 3.

On the main plate, a jump control lever 4, a date indicator wheel 5, a correction wheel 6 and a quick correction lever 7 are placed, and the date plate is screwed and fixed by the date plate pushing screws 8a, 8b, 8c. It is held by the pusher 9.

The tip of the jump control lever 4 has a forward rotation direction restricting surface 4a that engages with the adjacent tooth 1a1 formed on the inner peripheral side of the date plate 1 and an inverted shape that engages with the tooth 1a2. The control lever 4 has a rotation direction restricting surface 4b, and the jump control lever 4 is rotatably supported by a boss 10 planted in the main plate or the calendar back plate 2, and the boss 10 serves as an axis. The position of the date dial 1 in the rotational direction is regulated while being pressed outward by the elastic force of the jump control lever 4. When the tip of the jump control lever 4 presses the date dial 1 outward, the center of the date dial 1 is set to the tooth 1 of the date dial 1 described above with respect to the center of the timepiece.
a tip and outer peripheral portion 2a of the calendar back plate 2 (guide portion)
It is slightly eccentric because there is a proper gap with.

To explain the date changing operation, the claw 5a of the date indicator driving wheel 5 decelerated from the pointer wheel 3 causes a stroke corresponding to one pitch of the teeth 1a of the date dial 1. The date dial 1 is sent and the date dial 1 is fed in the normal rotation direction of the date dial as indicated by arrow A, and the date is switched for one day. During the date feeding, the teeth 1a of the date dial 1 are rotated and pushed while pressing the jump control lever 4 inward.

However, since the date plate 1 makes one revolution every 31 days, the date needs to be corrected for a small moon. The date correction is performed by rotating the unillustrated winding stem, which is an external operation member, in one direction, and converting the rotational movement of the correction wheel 6 interlocking with the winding stem into a linear movement by means of the claw portion 7a of the quick correction lever 7 that allows the date dial 1 The date is corrected by sending a stroke corresponding to one pitch of the tooth 1a of.

With the calendar feeding mechanism having the above-described structure, in a normal date plate outer diameter, for example, a date plate having an outer diameter of about 21 mm,
When an unexpected external impact force F1 is received in the 6 o'clock to 12 o'clock direction (F1 in FIG. 3) orthogonal to the longitudinal direction of the watch band, a reaction force F2 is generated on the date dial 1. As previously mentioned,
Since the rotation center of the date dial 1 is eccentric with respect to the center of the guide of the calendar back plate 2, the reaction force F2 of the date dial 1 causes the rotational force f1 (direction of arrow B) along the guide of the calendar back plate 2.
Occurs.

However, since the normal rotation moment of the size of the date plate is not extremely large, the rotation moment of the date plate and the impact force F1 and the amount of eccentricity between the rotation center of the date plate and the rotation center of the guide of the calendar back plate. Since the rotational force f1 generated by the above does not become extremely large, the teeth 1a (1a2 in FIG. 4) of the date dial 1 do not ride over the reverse rotation direction restricting surface 4b of the jump control lever 4. Therefore, the date dial 1 does not return for one day, and the position of the date dial 1 in the rotation direction is restricted by the jump control lever 4.

As described above, since the numbers are printed for 31 days on the outer peripheral portion of the surface of the date plate, the size of the numbers becomes small, and the date display is made from the window frame formed on the dial. It is difficult to visually recognize, and there is a demand that the date display be enlarged to increase the size of the numbers to make the date display easier to see.

[0011]

However, if the date dial is enlarged in order to make the date display easy to see, there are the following problems. That is, when an unexpected external impact force F1 is received, a reaction force F2 is generated on the date dial, and a rotational force is generated in the date dial reverse rotation direction (arrow B). Since the outer diameter of the date plate is large, for example, the date plate having an outer diameter of about 26 mm, the moment of inertia is several times, for example, about three times as large as that of the normal date plate described above, and the rotational force due to the impact is proportionally increased. The teeth of the date plate may pass over the reverse rotation direction regulating surface 4b of the jump control lever, and the date plate may return for one day.

When an external impact force F01 in the opposite direction to the external impact force F1 is received, a reaction force F02 is generated,
At that time, a rotational force f2 is generated, and the rotational force f2 may cause the date dial to move forward by one day.

The object of the present invention is to solve the above problems,
(EN) Provided is a calendar feed mechanism for a pointer type timepiece in which the date dial is made large to make the date display easy to see and the date dial does not fly even when an unexpected external impact force is applied.

[0014]

In order to achieve the above object, the calendar feeding mechanism of the pointer type timepiece according to the present invention comprises:
A date driving wheel driven by a pointer driving wheel train that drives a pointer, and a date dial sent by a claw formed on the date driving wheel,
A calendar back plate that guides the tooth tips formed on the inner peripheral side of the date plate, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and the date plate In a calendar feed mechanism of a pointer type timepiece having a correction mechanism for correcting the displayed display, a notch portion is provided in a part of a guide formed on an outer peripheral portion of the calendar back plate. Is.

Further, the notch is formed so as to face the normal rotation direction of the date dial.

Further, a date indicator driving wheel driven by a pointer driving wheel train for driving a pointer, a date dial fed by a claw formed on the date indicator driving wheel, and an inner peripheral side of the date dial are formed. A calendar back plate that guides the tooth tips, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and a correction mechanism that corrects the display displayed on the date plate. In the calendar feed mechanism of the pointer type timepiece including the above, the shape of the tip of the jump control lever has a forward rotation direction restricting surface and a reverse rotation direction restricting surface that engage with the teeth of the date plate. The direction regulation surface is
The jump control lever is formed so as to be substantially perpendicular to the center of a boss that pivotally supports the jump control lever.

Further, a date indicator driving wheel driven by a pointer driving wheel train for driving a pointer, a date dial sent by a claw formed on the date indicator driving wheel, and an inner peripheral side of the date dial are formed. A calendar back plate that guides the tooth tips, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and a correction mechanism that corrects the display displayed on the date plate. In the calendar feeding mechanism of the pointer type timepiece equipped with, a notch is provided in a part of the guide formed on the outer peripheral portion of the calendar back plate, and the shape of the tip of the jump control lever is the date dial. Has a forward rotation direction restricting surface and a reverse rotation direction restricting surface that engage with the teeth of, and the reverse rotation direction restricting surface is substantially perpendicular to the center of the boss that pivotally supports the jump control lever. It is characterized in that it is formed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A calendar feeding mechanism for a pointer type timepiece according to the present invention will be described below with reference to the drawings. FIG. 1 relates to an embodiment of the present invention, and FIG. 1 is a plan view of a timepiece that uses a date dial to display the date, as seen from the dial side.
FIG. 2 is a plan view of an essential part of FIG. The same members as those in the prior art are designated by the same reference numerals.

The difference between the embodiment of the present invention and the conventional example is that the shape of the guide portion on the outer peripheral portion of the calendar back plate and the shape of the tip end portion of the jump control lever are provided with the sun fly prevention against external impact. It is a thing. That is, in FIG. 1 and FIG.
An appropriate gap is provided between the tips of the teeth 1a of the date dial 1 and the outer peripheral portion 2a of the calendar back plate 2 so that the date dial 1 can rotate smoothly. First, the notch 2b is provided in a part of the guide formed on the outer peripheral portion 2a of the calendar back plate 2. The notch 2b
Are formed so as to face the normal rotation direction (arrow A) of the date plate. Note that the notch 2b is formed in the calendar back plate 2 near 6 o'clock to 12 o'clock, which is orthogonal to the longitudinal direction of the watch band that is susceptible to the external impact force F1.
It is effective to provide it on the outer peripheral portion 2a.

The operation and effect of the above configuration will be described. When an external impact force F01 is received, a reaction force F is applied to the date dial 1.
02 occurs. At that time, since there is an appropriate gap between the tip of the date plate 1 and the teeth 1a and the outer peripheral portion 2a (guide portion) of the calendar back plate 2, the tooth 1a of the date plate 1 moves to the position shown by the dotted line in FIG. To do. The teeth 1 a of the date dial 1 come into contact with the outer peripheral portion 2 a (guide portion) of the calendar back plate 2. Since the rotation center of the date dial 1 is eccentric with respect to the center position of the guide portion of the calendar back plate 2, a rotational force f2 is generated in the reaction force F02 of the date dial 1 and rotates in the forward rotation direction (arrow A). However, when the inclined surface portion of the tooth 1a of the date dial 1 comes into contact with the surface of the notch 2b formed in a part of the guide of the outer peripheral portion 2a of the calendar back plate 2, the date dial 1
Rotation in the direction of arrow A is blocked. Therefore, the external impact force F
With 01, it does not advance one day.

Further, when an external impact force F1 in the opposite direction is received, after the reaction force F2 is generated, a force in the same direction as that of F01 is further generated as a secondary impact. Due to the secondary impact at 1, the date plate 1 will not move forward one day.

Next, the shape of the tip of the jump control lever will be described. 1 and 2, the tip portion of the jump control lever 4 has a shape in which the forward rotation direction restricting surface 4a engaging with the adjacent tooth 1a1 formed on the inner peripheral side of the date plate 1 and the tooth 1a2.
Reverse rotation direction restricting surface 4b that engages with and both restricting surfaces 4a, 4
b has a flank 4c communicating with b, and the jump control lever 4
Is rotatably supported by a boss 10 that is planted on the main plate or the back plate of the calendar, and the boss 10 is pushed by the elastic force of the jump control lever 4 toward the outside of the date plate 1 about the boss 10 as an axis. The position in the rotation direction is regulated. The reverse rotation direction regulating surface 4b
2 is a line drawn from the center 10a of the boss 10 which pivotally supports the jump control lever 4 to the reverse rotation direction restricting surface 4b of the jump control lever 4 as shown by a chain double-dashed line in FIG. , Intersect at almost right angles.

The operation and effect of the above configuration will be described. As described in the prior art, the jump control lever 4 is the date plate 1.
The tooth position 1a1 of the date plate 1 rotates while pressing the jump control lever 4 inwardly during the date feeding by the switching operation of the normal date, and the tooth 1a1 does the jump control. The normal day rotation direction control surface 4a of the lever 4 is pushed up to get over and the day dial 1 is fed for one day.

However, unexpected external impact force F1
When receiving the sun, the reaction force F2 is generated in the date plate 1, and at that time, the rotation center of the date plate 1 is eccentric with respect to the center of the guide of the calendar back plate 2. A rotational force f1 is generated in the plate reverse rotation direction (arrow B). A large date dial outer diameter, for example, in the date dial 1 having an outer diameter of about 26 mm,
The moment of inertia is several times larger than that of the normal date dial 1 mentioned above,
For example, the rotational force f1 increases in proportion to about three times, but the reverse-direction restricting surface 4b of the jump control lever 4 does not move to the date plate 1.
Adjacent teeth 1a2 are formed so as to be substantially perpendicular to the center 10a of the boss 10 which pivotally supports the jump control lever 4, so that the jump control lever 4 cannot rotate and escape. , The adjacent tooth 1a2 of the date plate 1 is the jump control lever 4
The reverse rotation direction restricting surface 4b does not get over. Therefore, rotation of the date plate 1 in the direction of arrow B is prevented. Therefore, the external impact force F1 does not return after one day.

[0025]

As described above, even when the date display is made to have a desired outer diameter and the date display is made easy to see, an unexpected external impact force causes an inadvertent increase in the moment of inertia of the date plate. It is possible to provide a calendar feed mechanism of a pointer type timepiece which can prevent the date dial from jumping and is highly reliable.

[Brief description of drawings]

FIG. 1 is a plan view of a timepiece that uses a date dial to display a date according to an embodiment of the present invention, as seen from the dial side.

FIG. 2 is a plan view of an essential part of FIG.

FIG. 3 is a plan view of a timepiece that uses a conventional date dial to display the date, as seen from the dial side.

FIG. 4 is a plan view of an essential part of FIG.

[Explanation of symbols]

1-day board 1a tooth 1a1, 1a2 adjacent teeth 2 calendar back plate 2a Outer periphery (guide) 2b Notch 4 Jump control lever 4a Forward rotation direction control surface 4b Reverse rotation direction control surface 5 day drive 5a nail 6 modified car 7 Quick correction lever 7a Claw 8a, 8b, 8c Date indicator push screw 9 days board Oshie 10 Boss F1, F01 External impact force F2, F02 Reaction force f1, f2 rotational force

Claims (4)

[Claims] 1. A date indicator driving wheel driven by a pointer driving wheel train for driving a pointer, a date dial fed by a claw formed on the date indicator driving wheel, and an inner peripheral side of the date dial. A calendar back plate that guides the tooth tips, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and a correction mechanism that corrects the display displayed on the date plate. A calendar feeding mechanism for a pointer type timepiece, wherein a notch is provided in a part of a guide formed on an outer peripheral portion of the calendar back plate. 2. The calendar feeding mechanism for a pointer type timepiece according to claim 1, wherein the cutout portion is formed in a direction facing a normal rotation direction of the date dial. 3. A date indicator driving wheel driven by a pointer driving wheel train for driving a pointer, a date dial sent by a claw formed on the date indicator driving wheel, and an inner peripheral side of the date dial. A calendar back plate that guides the tooth tips, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and a correction mechanism that corrects the display displayed on the date plate. In the calendar feed mechanism of the pointer type timepiece including the above, the shape of the tip of the jump control lever has a forward rotation direction restricting surface and a reverse rotation direction restricting surface that engage with the teeth of the date plate. The calendar feed mechanism of the pointer type timepiece, wherein the direction regulating surface is formed so as to be substantially perpendicular to the center of the boss that pivotally supports the jump control lever. 4. A date indicator driving wheel driven by a pointer driving wheel train for driving a pointer, a date dial sent by a claw formed on the date indicator driving wheel, and an inner peripheral side of the date dial. A calendar back plate that guides the tooth tips, a jump control lever that engages with the teeth of the date plate to regulate the position in the rotation direction of the date plate, and a correction mechanism that corrects the display displayed on the date plate. In the calendar feeding mechanism of the pointer type timepiece equipped with, a notch is provided in a part of the guide formed on the outer peripheral portion of the calendar back plate, and the shape of the tip of the jump control lever is the date dial. Has a forward rotation direction restriction surface and a reverse rotation direction restriction surface that engage with the teeth of
The calendar feed mechanism of the pointer type timepiece characterized in that the reverse rotation direction regulating surface is formed so as to be substantially perpendicular to the center of the boss that pivotally supports the jump control lever.