JPS6239338Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time-telling mechanism for a timepiece, and particularly to a time-telling mechanism that performs a time-telling operation at a desired time-telling time and performs a time-telling assistance operation before and after the time-telling operation.

Time-reporting clocks are well known that perform time-telling actions such as striking the hour at the desired time, that is, on the hour when the minute hand points to the 0 minute position, and also perform time-telling auxiliary actions such as opening and closing a pigeon door before and after the time-telling action. It allows you to know the time without visually checking the time indicator hand, and is widely used in cuckoo clocks and the like.

Conventionally, a mechanism as shown in FIG. 1 has been used as this type of alarm mechanism.

In the figure, when the predetermined notification time is reached, arrow A
The swing lever 1 is
2 is rotated in the direction of arrow B against the spring biasing force,
While an auxiliary time warning operation such as opening the pigeon door is carried out, the comb teeth 16 are sent and driven in the direction of arrow C against the spring biasing force by the rotation of the comb tooth feeding cam 10 and the swinging of the counter hook 14. , the alarm operation is started. When the drive cam further continues to rotate, a lock cam (not shown) interlocked with the drive cam rotates the lock lever 18 clockwise, and the lock pin 20 provided on the lock lever 18 locks the swing lever 1.
2, the swing lever 1 is pushed into the lock part 12a of the
2 lock is performed. When the predetermined time notification operation is completed, the counter hook 14 locks the comb teeth 16 by the urging force of the contact plates 22 and 24 that control the rotation of the comb feed cam 10, and at this time, the Contact plate 2
2 and 24 are turned off and the rotation of the comb feed cam 10 is stopped, thereby completing the alarm operation. Said Katori kama 1
4 is locked, the counter hook 14 is locked by the lock lever 18.
The lock pin 20 is driven to release the locking of the swing lever 12 by the lock pin 20, and an auxiliary alarm operation such as closing the pigeon door is performed.

However, in the conventional time-telling mechanism of a watch, as described above, the rocking lever 12 is unlocked by the lock pin 20 using the driving force of the counter hook 14, so that the rocking lever 12 may not be unlocked properly. There was a drawback that it occurred. That is, when the swing lever 12 is locked by the lock pin 20, the locked state is maintained by the biasing force of the swing lever 12, so a strong biasing force is required to release the lock. However, in the conventional mechanism, the lever 14 is slightly rotated by the biasing force of the contact plates 22 and 24 that control the rotation of the comb feed cam 10, and the lock is released using the driving force at this time. As a result, lock release failures occurred. As a result, the contact plates 22 and 24 may continue to turn on even after the desired alarm operation has been completed, resulting in an abnormal alarm, or it may not be possible to reliably perform alarm auxiliary operations such as closing the pigeon door. There were flaws.

This kind of lock release failure occurs when the contact plates 22, 24
It is also possible to solve this problem by increasing the urging force or by increasing the size of the counter hook 14 to increase its inertial force. However, the contact plates 22,2
Increasing the biasing force of the lever 4 and increasing the size of the lever 14 increases the force required to drive the lever 14 when the swing lever 12 is locked, which increases power consumption and weakens the mechanism. It had the disadvantage of being larger.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide a time-telling mechanism for a watch that can reliably unlock the rocking lever using a mechanism that consumes less power and is more compact. It's about doing.

In order to achieve the above object, the present invention has a comb tooth that sets the number of alarm times based on the amount of rotation, a comb tooth feed cam that is driven by a motor to rotate the comb teeth, and a comb tooth feed cam that uses a comb tooth feed cam to set the alarm time by the amount of rotation. A rocking lever that is set directly or indirectly and performs a warning assist operation when the warning ends, and a lock lever that has a lock pin and holds the rocking lever in the set state during the warning and releases the rocking lever after the warning ends. In the time-telling mechanism of a watch, which includes: a swing lever drive cam that works in conjunction with a comb-teeth feed cam to rotate the swing lever to the set state; and a lock lever that has a lock release pin that engages with comb teeth and releases the engagement between the lock pin and the swing lever at the time of the final alarm operation, and the swing lever drive cam is configured to lock the swing lever. It is characterized by holding the rocking lever until the notification operation is completed after the lock release of the rocking lever by the release pin is completed, and then releasing the engagement with the rocking lever and causing the rocking lever to perform the notification assisting operation. do.

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

FIG. 2 shows a preferred embodiment of the time-telling mechanism for a timepiece according to the present invention. In the figure, a comb tooth 26 is rotatably supported on a shaft fixed to a timepiece support plate, and the comb teeth 26 are always supported by the arrow A. It is elastically biased in the direction. The comb teeth 26 select the number of rotations of the motor, that is, the number of strokes per hour, depending on the swing position of the rack teeth 26a, and this swing position is controlled by a counter cam (not shown). In order to rotate the comb teeth 26 by a predetermined amount and set the number of minutes, a comb feed cam (not shown) is fixed to the rotating shaft 28 of the drive motor. The feeding pin meshes with the rack teeth 26a of the comb teeth 26, and each rotation of the motor releases the engagement between the protrusion of the counter hook (not shown) and the rack teeth 26a of the comb teeth 26, and the rack teeth 26a are released. It is configured to be driven to feed one tooth at a time.

A swing lever 3 is attached to the watch plate with a shaft 30.
2 is rotatably provided, and this swing lever 32 is set by a comb tooth feed cam at the start of the alarm, and performs an alarm assisting operation at the end of the alarm. In this embodiment, the alarm assisting operation of the swing lever 32 is configured to open and close the pigeon door. That is, the swing lever 32 is always biased in the direction of arrow B by the pigeon door opening/closing rod 34, and the closed state of the pigeon door can be obtained at the swing position of the swing lever 32 shown in FIG.

In order to rotate the swing lever 32 to the set state, a swing lever drive cam 36 is fixed to the rotating shaft 28, and the rotation of the swing lever drive cam 36 causes the abutting portion 32a of the swing lever 32 to move into the cam. Surface 36
As a result, the swing lever 32 is rotated in the direction of arrow C, and the pigeon door can be opened. When the swing lever drive cam 36 continues to rotate further, the contact portion 32a of the swing lever 32 falls into the depressed surface 36b of the swing lever drive cam 36, and as a result, the swing lever 32 rotates in the direction of arrow B. A closed state of the pigeon door can be obtained.

In order to hold the rocking lever 32 in the set state during the alarm and release the rocker lever 32 after the alarm is finished, the lock lever 4 is attached to the watch plate by a shaft 38.
0 is rotatably provided. A lock pin 42 that engages with a lock groove 32b formed in the swing lever 32 is formed at one end of the lock lever 40, and the lock state of the swing lever 32 is maintained by the engagement between the lock pin 42 and the lock groove 32b. be done. Then, rotate the lock lever 40,
In order to lock the swing lever 32, the rotating shaft 28
A lock cam 44 is fixed to the swing lever 32.
is rotated to the maximum position in the direction of arrow C by the swing lever driving cam 36, the lock cam 44 contacts and drives the contact portion 40a formed on the lock lever 40, and the lock pin 42 and the lock groove 32b are engaged with each other. Accordingly, the swing lever 32 can be kept in a locked state.

Further, in order to release the engagement between the lock pin 42 and the lock groove 32b at the time of the final alarm operation, a lock release pin 46 is formed at the other end of the lock lever 40. In the present invention, this lock release pin 46 has comb teeth. 26. That is, when a predetermined notification time is reached, the comb teeth 26 are fed and driven in the direction of arrow D from the rotational position set by the counting cam by the rotation of the comb tooth feeding cam, but During the alarm operation by one rotation, the feed driving force of the comb teeth 26 is transmitted to the lock release pin 46, and the lock lever 40 is rotated in the direction of arrow E, thereby releasing the engagement between the lock pin 42 and the lock groove 32b. be able to.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

When the predetermined notification time is reached from the state shown in FIG. 2 before the start of notification, the comb teeth 26 are released from the locking by the multi-pole cam and reach the position where they come into contact with the multi-pump cam due to the biasing force of the contact plate. Rotate in the direction of arrow A. At the same time, the contact plate is turned on and the rotating shaft 28 rotates in the direction of arrow F, and as shown in FIG.
direction and held in the open position of the pigeon door.
At this time, the lock pin 42 of the lock lever 40 is in contact with the opening of the lock groove 32b of the swing lever 32.

As the rotating shaft 28 continues to rotate further, the lock lever 40 moves against the lock cam 4 as shown in FIG.
4, the lock pin 42 enters the lock groove 32b while slightly rotating the swing lever 32 in the direction of arrow C, and the swing lever 32 is in the locked state, that is, the pigeon door is held open. can be obtained. Incidentally, as is clear from FIGS. 2 to 4, the swing lever 32 is in the locked state until the rotating shaft 28 makes one rotation for the first time.

Thereafter, the rotating shaft 28 continues to rotate the number of times corresponding to the predetermined notification time, and the desired timing action is performed. At this time, the contact portion 32a of the swinging lever 32 Since it is located slightly away from the surface 36a and the lock lever 40 is not rotated by the lock cam 44, it does not affect the locked state of the swing lever 32.

The comb teeth 26 are driven to be fed in the direction of arrow D with the rotation of the comb tooth feed cam, and the comb teeth 26 press and drive the lock release pin 46 as shown in FIG. 5 at the time of the last announcement operation (at the time of the first announcement operation in the case of the 1 o'clock and 30 minute announcement operations), and the lock lever 4
0 is rotated in the direction of the arrow E. As a result, the engagement between the lock pin 42 and the lock groove 32b is released,
The swing lever 32 rotates back in the direction of arrow B due to the biasing force of the opening/closing bar 34, and the dove door can be closed. In this way, the swing lever drive cam 36 holds the swing lever 32 so that the dove door is in the open state after the lock release pin 46 has completed releasing the lock on the swing lever 32 so that the dove door is open until the warning operation is completed, and then releases the engagement with the swing lever 32 to allow the swing lever 32 to perform the warning auxiliary operation, i.e., the closing operation of the dove door.

As explained above, according to the present invention, the rocking lever is unlocked by the feeding driving force of the comb teeth, so the rocking lever can be unlocked using a small and low power consumption mechanism. can be reliably unlocked.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the main parts of a conventional clock's time-telling mechanism.
Fig. 2 is an explanatory diagram showing a preferred embodiment of the time-telling mechanism for a timepiece according to the present invention, and Fig. 3 is an explanatory diagram showing the mechanism shown in Fig. 2 in which the swinging lever is rotated by a swinging lever drive cam. Fig. 4 is an explanatory drawing showing the state in which the lock lever is rotated by the lock cam in the mechanism shown in Fig. 2, and Fig. 5 is an explanatory drawing showing the mechanism shown in Fig. 2.
FIG. 3 is an explanatory diagram showing a state immediately before the lock lever is rotated by the comb teeth in the mechanism shown in the figure. 26... Comb teeth, 32... Rocking lever, 36...
Swing lever drive cam, 40... Lock lever, 4
2...Lock pin, 44...Lock cam, 46...
...Lock release pin.

Claims (1)

[Scope of utility model registration request] A comb tooth that sets the number of alarm times by the amount of rotation, and a comb tooth feed cam that is driven by a motor and rotates the comb tooth.
It has a rocking lever that is directly or indirectly set by a comb feed cam at the start of the warning and performs warning assisting operation at the end of the warning, and a lock pin that holds the rocking lever in the set state during the warning and makes a warning. In the clock mechanism, which includes a lock lever that releases the rocking lever after the end of the operation, a rocking lever drive cam that is linked to the comb feed cam and rotates the rocking lever to the set state; A lock cam that rotates the lock lever to lock the swing lever,
a lock lever that has a lock release pin that engages with the comb teeth and releases the engagement between the lock pin and the swing lever at the time of the final alarm operation; A time-telling mechanism for a watch characterized in that a rocking lever is held until the time-telling operation is completed after the unlocking of the clock is completed, and then the engagement with the rocking lever is released to allow the rocking lever to perform a time-telling assistance operation. .