JPS6212868B2 - - 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 perform a desired warning function at the hour or half-hour indication are well known, and have the advantage of being able to accurately determine the time without continuing to move the indication hand by striking the hour 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. On the outer periphery of a counting cam 10, which rotates together with the hour hand wheel provided in the clock train, there is a timer cam 10 that indicates the time on the hour every 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 pulley 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 on 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 of the comb bar 12 and the counter cam 10, and by engaging the engagement protrusion 20 of the comb bar chain 18 with the comb bar chase teeth 14. In this state, the counter hook 18 moves the other contact plate 22b to the first
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 in accordance with the time.

When the hour hand indicates the hour or half o'clock,
The agekama 28 supported by the shaft 30 has one end 28
When a rotates synchronously with the clock wheel train, it falls into the valley of the cam wheel 32, rotates in the direction of arrow E, releases the engagement with the contact plate 22a, and then closes the contact plate 2 with the 1-minute lever described later.
2a is released, the contact plate 22a moves to the position indicated by the dashed line 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 comb feed cam 24 is connected to the motor, and the comb feed cam 24 rotates in the direction of arrow C at the same time as the time driving action due to the rotation of the motor, and its feed pin 26 feeds the comb check teeth 14 tooth by tooth in the direction of arrow D. When the lever 12 reaches the reference position, the engaging protrusion 2 of the counter hook 18
0 is detached from the comb barlet teeth 14 and the contact device 22 is released when the contact plate 22b is separated from the contact plate 22a.
to open. Simultaneously with this opening, the rotation of the motor is stopped and the alarming action is completed, and in FIG. 1, the alarming action is completed by striking the clock twice.

In order to accurately control the closing operation of the aforementioned hour 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, the one-minute lever 40 can be rotated 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 stopper pin 42, and in this position, the other end 40b of the one-minute lever 40 is pressed against 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, when the hour cam wheel 32 pushes up the contact plate 22a via the swing pin 28, the urging force of the one-minute lever 40 is directly applied to the contact plate 22a as a load, and as a result,
There is a drawback that a large load loss occurs on the hour cam wheel 32, that is, the timepiece wheel train, and the driving force of the timepiece wheel train needs to be increased, which also has a negative effect on the accuracy of time indication.

Furthermore, the conventional device has a drawback in that it is impossible to provide a cam groove on the outer periphery of the one-minute cam wheel 38 and allow the one end 40a of the one-minute lever 40 to fall into engagement with the cam groove. That is, unlike the conventional device shown in FIG. 1, a cam groove is provided on the outer periphery of the 1-minute cam wheel 38,
If the one-minute lever 40 has a structure that performs the desired time-telling action when the end 40a falls into the cam groove, the accuracy of the time-telling can be further improved.
According to the one-minute lever 40 shown in the figure, the rotation of the hour cam wheel 32 causes the age cam 28 to push up the contact plate 22a.
At this time, the 1-minute lever 40 causes a tension between the 1-minute cam wheel 38 and the contact plate 22a, and the one end 40a of the 1-minute lever 40 falls into the cam groove of the 1-minute cam wheel 38, causing the 1-minute There are drawbacks such as making it impossible for the cam wheel 38 to rotate.
It was impossible to replace 8a with a cam groove.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to reduce the load applied to the clock train by the control lever mechanism that sets the clock time, and to reduce the load on the clock train by the control lever mechanism that sets the clock time. This invention relates to an improved time notification mechanism that enables highly accurate time notification operation by engaging the control lever and the control lever.

In order to achieve the above object, the present invention provides an electrical alarm device, an alarm contact device having a contact plate that electrically controls the operation of the alarm device, and a clock wheel train that rotates in synchronization with a clock train to a predetermined position. a time cam wheel that controls the contact device to be in a state where it can be closed via the age cam at the announced time; and a state where the contact device can be closed at shorter intervals than the time cam wheel by rotating synchronously with a clock train and a control lever that transmits the contact control force of the control cam wheel to the contact plate of the contact device. When the Agekama falls onto 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 hold the contact plate. As a result, only when the contact device is enabled to be closed by both the hour cam wheel and the control cam wheel, the contact device is closed and the electric alarm device is activated. In the timepiece mechanism, one end of the control lever engages with a cam protrusion provided on the outer periphery of a control cam wheel, and the other end of the control lever is provided with an escape claw that is rotatable in only one direction; The biasing force of the relief spring that applies a biasing force to the relief pawl is set to be significantly smaller than the biasing force of the biasing spring that applies a biasing force to the control lever, and the contact plate engages with the relief pawl of the control lever. do.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a preferred embodiment of the present invention, and the same members as those in FIG. In FIG. 2, the contact control force of the control cam wheel 38 forming a one-minute cam wheel, such as the third wheel of the timepiece train, is transmitted to the contact plate 22a of the contact device 22 via the control lever 50. The control lever 50 is rotatably supported by a shaft pin 52 mounted on the base plate, and a biasing spring 54 supported by the shaft pin 52.
A locking pin 58 has one end attached to a fixing pin 56 fixed to the board and the other end attached to the control lever 50.
As a result, a biasing force in the direction of arrow G is applied to the control lever 50 by the biasing spring 54.

One end 50a of the control lever 50 is connected to the control cam wheel 38.
The cam projection 38a can be engaged with the cam projection 38a by contacting the outer periphery of the cam projection 38a. Also, the other end 50b of the control lever 50
A relief pawl 60 is rotatably supported on a shaft pin 62 erected on the shaft pin 62 . The escape claw 60 is the contact plate 22a
A locking end 60 forming a retainer that engages with the retainer and abutting the locking portion 50c of the control lever 50 on a part thereof.
A is provided. One end of the escape spring 64 supported by the shaft pin 62 engages with the control lever 50, and the other end engages with the hole 60b of the escape claw 60, thereby causing the escape claw 60 to move in the direction of arrow H. A pressing force is applied to the relief pawl 60 so that the locking end 60a abuts the locking portion 50c of the control lever 50. In the present invention, the biasing force of the relief spring 64 is set to be significantly smaller than the biasing force of the biasing spring 54 described above.

A preferred embodiment of the present invention has the above configuration,
The operation will be explained below with reference to FIGS. 3 to 7.

FIG. 3 shows a state in which the hour cam wheel rotates and the swallowtail cam pushes up the contact plate 22a in the direction of the arrow, and the tip of the contact plate 22a engages with the relief pawl 60 supported by the control lever 50. In this state, when the age cam moves the contact plate 22a further upward due to the rotation of the hour cam wheel, in the conventional device, the contact plate 22a
The biasing force of the biasing spring 54 of the control lever 50 is directly applied as a load, resulting in a large load loss to the hour cam wheel. Since the claw 60 is supported, the contact plate 22a
Only the biasing force of the relief spring 64 that engages with the relief pawl 60 is applied. That is, the fourth
As shown in the figure, the contact plate 22a is connected to the escape claw 60.
The control lever 50 itself has one end 50a connected to the control cam wheel 38 in the state of engagement and movement with the control lever 50.
maintain the state in contact with the outer periphery of the escape claw 60.
Only the escape spring 64 rotates against the urging force of the escape spring 64. As mentioned above, in the present invention, the biasing force of the relief spring 64 is set to be significantly smaller than the biasing force of the biasing spring 54, so the load loss applied to the hour cam wheel from the contact plate 22a at this time is compared to the conventional one. It is suppressed to a significantly small size and does not have a negative effect on the clock train.

FIG. 5 shows a state in which the contact plate 22a has moved over the relief pawl 60, and the relief pawl 60 is again pushed toward its locking end 60 by the biasing force of the relief spring 64.
a returns to the state in which it is in contact with the locking portion 50c of the control lever 50. When the hour cam wheel rotates to the alarming time, one end of the cam wheel falls into the valley of the hour cam wheel, and the cam wheel separates from the contact plate 22a.
As a result, as shown in FIG.
The tip of a is held by the escape claw 60 of the control lever 50. At this time, the counterclockwise rotation of the escape claw 60 is restricted by the locking end 60a, so that the contact plate 22a can be held securely.

FIG. 7 shows a state in which a desired notification time has been reached; at this time, the other protrusion 38a of the control cam wheel 38 presses one end 50a of the control lever 50 to rotate the control lever 50 clockwise. As a result, escape claw 6
0 is separated from the contact plate 22a, the contact plate 22a comes into contact with the other contact plate 22b because its engagement and holding action is released, and it becomes possible to obtain the closing action of the contact device 22, and the electrical notification is generated. The desired timing function is performed by the timing device.

As described above, according to the embodiment, when the contact plate climbs over the holding part of the control lever, the biasing force of the biasing spring of the control lever is not applied to the hour cam wheel via the contact plate, and the contact plate simply escapes. Since only a weak biasing force of the spring is applied to the hour cam wheel, there is an advantage that unnecessary load loss is not applied to the hour cam wheel, that is, the timepiece wheel train, in the hour preparation state.

As explained above, according to the present invention, by providing the control lever with an escape pawl, the biasing force of the control lever is not directly transmitted to the hour cam wheel, thereby reducing the load loss of the hour cam wheel, that is, the timepiece wheel train. Furthermore, the mechanism of the present invention makes it possible to realize a highly accurate time notification mechanism in which a cam groove is provided on the outer periphery of the control cam wheel.

[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 first embodiment of the alarm mechanism according to the present invention; FIG. 7 is an explanatory diagram of the operation of the embodiment. 22...Contact device, 22a...Contact plate, 32...
...Hour cam wheel, 38...Control cam wheel, 38b...Cam groove, 50...Control lever, 54...Biasing spring, 60...Escape pawl, 64...Escape spring.

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 contact plate, and as a result, both the hour cam wheel and the control cam wheel are able to close the contact device. In a timepiece mechanism in which a contact device is closed to activate an electric warning device, one end of the control lever engages with a cam protrusion provided on the outer periphery of a control cam wheel, The other end of the lever is provided with an escape claw that is rotatable in only one direction, and the biasing force of the escape spring that applies a biasing force to the escape claw is significantly smaller than the biasing force of the biasing spring that applies a biasing force to the control lever. A time telling mechanism for a timepiece, wherein the contact plate engages with a relief pawl of a control lever.