JPS6212866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time-telling mechanism for a timepiece, and more particularly to an improved time-telling mechanism capable of achieving a highly accurate time-telling action.

Clocks that have a desired time-telling effect at the indicated time of the hour or half-hour are well known, and have the advantage of being able to accurately determine the time without reading the indicating hand by striking or chiming. In recent years, electric alarm mechanisms that include a motor, etc. have been widely adopted, and for this purpose, a drive current is supplied to the motor at a predetermined alarm time, and a number of clock strikes or chimes sound corresponding to the indicated time. An alarm contact device is provided to control the motor to stop after completion of the alarm contact device, and the closing and opening of the alarm contact device is controlled by a mechanical counting device.

In order to improve the time reporting accuracy of the time reporting mechanism,
A time-telling mechanism was proposed in which the start time of the hour is controlled by both an hour cam wheel and a one-minute cam wheel that rotate in synchronization with the clock train, and was filed as Utility Model Registration Application No. 99976 in 1978. FIG. 1 shows the main parts of this conventionally proposed time-telling mechanism, in which the outer periphery of the counting cam 10, which rotates together with the hour hand wheel provided on the clock train, has a clock that indicates the hourly hour of the hour hand. Twelve stages of cam surfaces 10a corresponding to the positions are formed, and the number of warning strokes is set by a comb 12 having an abutting surface 12a that abuts the cam surface 10a. The comb 12 is biased in the direction of arrow A, and in the alarm preparation state, its abutting surface 12a abuts against the cam surface 10a of the counting cam 10 corresponding to the designated time, regulating the positioning at a predetermined rotational position. and controls the movement of the comb spacing teeth 14 provided on the outer periphery of the comb 12 from a predetermined reference position by the number of teeth corresponding to the number of strokes. The comb barlet tooth 14 is rotatably supported on a shaft 16 by an arrow B.
The engaging protrusion 2 of the counter hook 18 that is biased in the direction
0 can be engaged, and the counter hook 18 controls the closing and opening of the alarm contact device 22. The alarm contact device 22 supplies an alarm command signal to an alarm device including a motor (not shown), rotates the motor to perform a desired alarm action such as striking a desired time when the motor is closed, and performs an alarm action such as striking a desired time when the motor is closed. The motor is then stopped and the alarm action is completed. The closing/opening of the alarm contact device 22 is controlled by a counter hook 18, and the position of its contact plate 22a is controlled by a swallow hook, which will be described later. That is, the contact plate 22a is retracted to the position indicated by the broken line by the pinion 28 until the hour hand reaches the indicated time of the hour or half-hour, and in this state, the counting mechanism is ready to announce the hour. The notification preparation is carried out by determining the number of teeth to be moved from the reference position of the comb bar chase teeth 14 by the cooperation between the comb 12 and the counter cam 10, and by engaging the engagement protrusion 20 of the comb bar chase 18 with the comb bar chase teeth 14. In this state, the counter plate 18 moves the other contact plate 22b to the first position.
Push it up to the solid line position shown in the figure to bring the alarm contact device 22 into a state where it can be closed. In this timing preparation state, the engaging protrusion 20 of the counter hook 18 engages with the tooth corresponding to the designated time of the comb bar chase tooth 14, and in FIG. Preparations are being made to respond to the situation.

When the hour hand indicates the hour or half o'clock,
The age hook 28 disengages from the contact plate 22a, and when the contact plate 22a is further released by a one-minute lever, which will be described later, the contact plate 22a moves to the dashed line position and the alarm contact device 22 is closed. . Then, current is supplied from the alarm contact device 22 to the motor of the alarm device, and the alarm action is started by rotation of the motor. A kushiba feed cam 24 is connected to the motor.
At the same time as the time driving action by the motor rotation, the comb feed cam 24 rotates in the direction of arrow C, and its feed pin 26 drives the comb bar chase teeth 14 one tooth at a time in the direction of arrow D, and when the comb bar 12 reaches the reference position. , the engagement protrusion 20 of the counter hook 18 is disengaged from the comb-bar chain teeth 14, and the contact plate 22b is separated from the contact plate 22a, thereby opening the contact device 22. Simultaneously with this opening, the rotation of the motor stops and the alarm action is completed.
The time-honoring action will be completed with the second strike.

In order to accurately control the closing operation of the above-mentioned hourly contact device 22, the contact device 22 is controlled to be in a closeable state every minute by rotating synchronously with the clock wheel train, particularly the minute hand wheel, etc. A cam wheel 38 is provided, and the contact control force of the 1-minute cam wheel 38 is transmitted to the contact plate 22a of the contact device 22 by a 1-minute lever 40.
That is, one end 40a of the one-minute lever 40 is connected to eight cam protrusions 38 provided on the outer periphery of the one-minute cam wheel 38.
a, and can rotate the one-minute lever 40 counterclockwise against the biasing force in the direction of arrow F.
The other end 40b of the one-minute lever 40 is connected to the contact plate 22a.
As shown in FIG. 1, the contact plate 22a can be engaged and held in an open state. The biasing position of the one-minute lever 40 is determined by a stripper pin 42, and in this position, the other end 40b of the one-minute lever 40 is connected to the contact plate 22a.
It has entered the area where it engages with.

As described above, in the conventional device shown in FIG. Contact control force from the 1-minute cam wheel 38, which rotates at high speed and has good control accuracy, is transmitted to the contact plate 22a via the 1-minute lever 40, and the cam protrusion 38a of the 1-minute cam wheel 38 moves the 1-minute lever 40 counterclockwise. Contact plate 22a when rotated in the direction
is disengaged from the one-minute lever 40, making it possible to start highly accurate timing operation.

However, in this conventional device, the engagement between the 1-minute cam wheel 38 and the 1-minute lever 40 is performed by pushing up the lever end 40a by the cam protrusion 38a. In the operation start action, there are errors in the shape of the cam protrusion 38a of the 1-minute cam wheel 38 and the 1-minute lever 40, and the contact plate 2
Contact plate 22a and 1 due to variations in length of 2a, etc.
An error occurs in the disengagement position with the minute lever 40, resulting in a time-telling error of about 5 seconds, and this time-telling error becomes a problem in recent years with high-precision electronic watches that use crystal oscillators, etc. There was a drawback. The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a time-telling mechanism that further improves the time-telling accuracy of a time-telling mechanism using a one-minute cam wheel.

The present invention provides an electrical alarm device, a time alarm contact device having a contact plate for electrically controlling the operation of the alarm device, and a time alarm contact device that rotates in synchronization with a clock train to notify a predetermined time at a predetermined time. a control cam wheel that rotates in synchronization with a clock train and controls the contact device to a closeable state at shorter intervals than the hour cam wheel; a control lever that transmits the contact control force of the control cam wheel to the contact plate of the contact device; the time cam wheel pushes up the contact plate via the age cam, and the contact plate climbs over the control lever;
When the Agekama falls into the hour cam wheel before the notification time, the control lever holds the contact plate in an open state, and at the notification time, the control cam wheel rotates the control lever to release the holding of the contact plate. As a result, the contact device is closed only when both the hour cam wheel and the control cam wheel are capable of closing the contact device, and the time warning operation of the electric warning device is performed. In the time mechanism, the control cam wheel is provided with a drop-in cam groove on its outer periphery into which one end of the control lever drops instantaneously every minute, and the control lever engages with the drop-in cam groove of the front control cam wheel. a first lever body having a cam engager that is swingably held by the first lever body and has a contact engager that projects into the rotation area of the contact plate at one end thereof and is held in a predetermined position relative to the first lever body; The second lever body is biased to the position and is retractable from the contact plate upon contact with the contact plate when the contact plate is pressed and rotated in preparation for alarm.

FIG. 2 shows a preferred embodiment of the time-telling mechanism according to the present invention, in which the same members as those in the conventional device in FIG. 1 are given the same reference numerals, and the counting mechanism in FIG. Since they have the same configuration, they are omitted in FIG. 2.

In FIG. 2, the control cam wheel 38 is provided on its outer periphery with eight falling cam grooves (hereinafter simply referred to as cam grooves) 44 that rotate one pitch at one minute intervals. The control lever, which is supported by a shaft 46 on the watch body, has a first lever body 48 and a second lever body 50.
The first lever body 18 has a cam engager 5 at one end that engages with the cam groove 44 of the control cam wheel 38.
2, the pin 68 and the first
A biasing spring is provided between the lever body 48 and a pin 58, and this biasing spring 7
0, the cam engager 52 is always in the control cam wheel 38.
It is biased in the direction of arrow G so as to come into contact with it. Further, the second lever body 50 is connected to the first lever body 4
8 is pivotally supported by a shaft 46 so as to be able to swing freely, and the range of its swing is such that the pin 54 erected on the second lever body 50 is
It is regulated by engaging with the elongated hole 56 of the lever body 48. A biasing spring 60 is applied between the pin 54 and the pin 58 that is set on the first lever body 48, and the biasing spring 60 causes the second lever body 50 to move against the first lever body 48. is biased in the direction of arrow H, and the pin 54 is positioned and held in a state in which it abuts the upper end of the elongated hole 56. The second lever body 50 is provided with a contact engager 62,
It can engage with the contact plate 22a described above.

The embodiment of the present invention has the above configuration, and its operation will be explained below with reference to FIGS. 2, 3, 4, and 5.

FIG. 3 shows a state in which the hour cam wheel 32 pushes up the age cam 28, and as a result, both contact plates 22a, 22b of the contact device 22 are pushed up and moved in an open state by the age cam 28 and the counter cam 18. During this period, the control lever repeats rocking motion while its cam engager 52 contacts the cam groove 44 of the control cam wheel 38 and the outer periphery of the control cam wheel 38, and its contact engager 62 engages both contact plates 22a, 22b. may enter the rotational range of the two, causing contact between the two. However, in the present invention, the second lever body 50 having the contact engager 62 is attached to the first lever body 48 whose position is regulated by coming into contact with the outer periphery of the control cam wheel 38. When the contact engager 62 and the contact plate 22b are in contact with each other as shown in FIG. 3, the second lever body 50 is pushed away by the contact plate 22b, and the contact plate 22b There is no problem with rotation. As shown in FIG. 3, at the time of this contact, the pin 54 of the second lever body 50 moves in the elongated hole 56 of the first lever body 48 against the biasing force of the biasing spring 60, and the contact engagement 62 can be retracted from the rotation area of the contact plate 22b.

Although FIG. 3 shows the state of contact between the contact engager 62 and the contact plate 22b, the contact engager 62 can also perform a similar retracting action on the contact plate 22a, and is in a state ready for notification. In this way, it is possible to reliably prevent malfunctions or damage caused by tension in each mechanism.

FIG. 4 shows the preparation state immediately before the hour warning, in which the protrusion 28a of the age cam wheel 28 falls into the valley of the hour cam wheel 32, allowing the hour cam wheel 32 to close the hour warning contact device 22; The second lever body 50 is positioned and held at a holding position with respect to the first lever body 48 by a biasing spring 60, and the contact engagement member 6
2 can reliably engage and hold the contact plate 22a in an open state.

FIG. 5 shows a state in which the notification time has arrived and the cam engager 52 has fallen into the cam groove 44 of the control cam wheel 38, and at this time, the control lever is rotated in the direction of arrow G and the contact engager 62 is rotated in the direction of arrow G. releases the engagement of the contact plate 22a,
The closing operation of the alarm contact device 22 is performed. Therefore, the electrical warning device (not shown) starts the warning action by the closing operation of the warning contact device 22, and can perform the desired warning action such as striking the clock. If the contact engager 6 of the contact plate 22a and the second lever body 50 is damaged due to a shape error of the first lever body 48 and the second lever body 50 or variations in the length of the contact plate 22a, etc.
Even if an error occurs in the disengagement position with the control cam wheel 38, the notification action shown in FIG. The accuracy of time and time is significantly improved compared to the conventional method, and it becomes possible to suppress the time error to about 1 second.

As explained above, according to the present invention, the time-telling accuracy of the time-telling mechanism can be significantly improved, and it becomes possible to provide a time-telling mechanism that is extremely suitable for high-precision electronic watches and the like. Incidentally, the control cam wheel cam operation interval can be arbitrarily set other than the 1 minute interval in the embodiment.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts showing a conventional alarm mechanism, FIG. 2 is a plan view of essential parts showing a preferred embodiment of the alarm mechanism according to the present invention, and FIGS. It is a top view which shows each operating state of. 10... Katori Kam, 12... Kushiba, 18...
Counter kama, 22... Notification contact device, 22a, 22
b...Contact plate, 28... Age cam, 32... Hour cam wheel, 38... Control cam wheel, 44... Cam groove, 4
8...First lever body, 50...Second lever body, 5
2...Cam engager, 54...pin, 56...elongated hole, 60...biasing spring, 62...contact engager.

Claims (1)

[Claims] 1. An electrical alarm device, a time alarm contact device having a contact plate that electrically controls the operation of the alarm device, and a time alarm contact device that rotates in synchronization with a clock train and connects the contact point via a pinwheel at a predetermined time alarm. a time cam wheel that controls the device to be in a closeable state; a control cam wheel that rotates synchronously with the clock train and controls the contact device to be in a closeable state at shorter intervals than the hour cam wheel; and a control cam wheel. a control lever for transmitting the contact control force of the contact device to the contact plate of the contact device, the hour cam wheel pushes up the contact plate through the age cam, the contact plate climbs over the control lever, and the age cam moves before the notification time. When falling into the cam wheel, the control lever holds the contact plate in the open state, and
At the notification time, the control cam wheel rotates the control lever to release the holding of the contact plate, and as a result, only when both the time cam wheel and the control cam wheel are able to close the contact device. In a timepiece alarm mechanism in which a contact device is closed to activate an electric alarm device, the control cam wheel has a depression on its outer periphery that causes one end of the control lever to drop instantaneously every minute. A cam groove is provided, and the control lever is swingably held by the first lever body and a first lever body having a cam engager that engages with the falling cam groove of the control cam wheel. Contact with the contact plate when the contact plate is pressed and rotated in preparation for warning when the contact plate has a contact engager that enters into the rotation area and is urged to a predetermined holding position with respect to the first lever body. A time-telling mechanism for a watch, characterized in that it sometimes includes a second lever body that can be retracted from a contact plate.