JP2003255058A - Electronically controlled mechanical timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronically controlled mechanical timepiece capable of reducing rotational irregularities of pointers, such as a second hand without the need for enlarging the size of the timepiece as a whole. <P>SOLUTION: A rotating shaft 13c of a rotor 13 is connected to an inertial plate 31 rotation-freely provided for the rotor 13 by a hair spring 32. By making the amount of deformation of the hair spring 32, provided for a biasing mechanism 30 larger, as the amount of variation of the rotational speed of the rotor 13 becomes larger, a suppression force, corresponding to the amount of variation of the rotational speed, is added to the rotor 13 from the inertial plate 31. By this, since the biasing mechanism 30 relaxes the speed variations of the rotor 13, even if an electronic circuit provided for the electronically controlled mechanical timepiece allows for the variations of the rotational speed of the rotor 13 within one period, it is possible to efficiently suppress the rotational irregularities of the pointers such as the second hand, even if the variations of a rotation driving force transmitted to the rotor 13 occur. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention operates mechanical energy when a mainspring is opened as a drive source, partially converts it into electric energy, and operates rotation control means by this electric power to control a rotation cycle. The present invention relates to an electronically controlled mechanical timepiece.

[0002]

BACKGROUND ART Conventionally, as shown in FIGS. 6 and 7,
While driving the train wheel 51 using the mainspring 1a as an energy source, the rotating train 51 receives rotation from the train wheel 51 to generate power in the rotating generator 20, and the electronic circuit 55 driven by this power rotates the generator 20 in a rotation cycle. There is known an electronically controlled mechanical timepiece 50 in which the train wheel 51 is braked to adjust the speed by controlling the speed (see Japanese Patent Laid-Open No. 8-5758).
No. In this electronically controlled mechanical timepiece 50,
The rotation of the barrel wheel 1 in which the mainspring 1a is accommodated is transmitted to the center wheel & pinion 6 to which a minute hand (not shown) is attached, and then the third wheel 7, the fourth wheel 8, the fifth wheel 11, and the sixth wheel. It is transmitted to the vehicle 12 and finally transmitted to the rotor 13 of the generator 20. As a result, the rotational force of the mainspring 1a is
The speed is increased to a predetermined rotation speed before being transmitted to.

Here, in the electronically controlled mechanical timepiece 50, the rotational driving force of the mainspring 1a is transmitted to the rotor 13 through a plurality of wheels 6 to 8, 11 and 12 forming the train wheel 51. Since the number is 6 to 8, 11, 1
If there is a slight error in the shape and size of the tooth No. 2, the meshing of these wheels 6 to 8, 11, 12 will vary, and the rotational driving force transmitted to the rotor 13 will also vary. Then, the electronic circuit 55 monitors the cycle of the AC power generated by the generator 20, detects one cycle of the rotor 13 provided in the generator 20 (the time during which the rotor 13 makes one rotation), and detects one cycle of the rotor 13. The rotation speed of the rotor 13 is controlled so that the cycle becomes a set time. The electronic circuit 55 is connected to a crystal oscillator (not shown) that outputs a stable clock signal at a predetermined cycle regardless of the influence of environmental changes such as temperature fluctuations.
Even if there is a variation in the rotational torque transmitted to the electronically controlled mechanical timepiece 50, the crystal oscillator enables the electronically controlled mechanical timepiece 50 to adjust the rate with high accuracy as in a normal quartz timepiece.

[0004]

In the electronically controlled mechanical timepiece 50 as described above, one cycle of the rotor 13, that is,
Although the time required for the rotor 13 to make one rotation can be accurately adjusted, if the time required for one rotation of the rotor 13 is constant, even if the rotation speed of the rotor 13 changes before the rotor 13 makes one rotation, Since the control is not made so as to correct this, there is a problem that unevenness in rotation (hand movement) occurs such that the second hand moves faster or slower due to variations in the rotational driving force transmitted to the rotor 13. is there.

Further, when a large external force is applied in the direction in which the timepiece is delayed due to an impact due to a drop or the like, a large braking force is applied to the rotor 13, so that the hands such as the second hand are momentarily stopped, and conversely, due to the impact. However, when a large external force is applied in the direction in which the clock advances, a large driving force is applied to the rotor 13, so that the hands, such as the second hand, are momentarily accelerated and decelerated, which also causes uneven rotation of the hands. There is. Specifically, when the rotor 13 is rotating at a low speed, it is originally necessary to control the rotor 13 to the high speed side, but if a large external force is applied at this time in the direction in which the clock advances, the rotor 13 will momentarily move. The electronic circuit 55 rotates at high speed and the rotor 1
3 is determined to be rotating at a sufficiently high speed. As a result, the electronic circuit 55 controls to apply a large braking force to the rotor 13 which is actually rotating at a low speed, which causes a problem that the rotation of the rotor 13 is stopped. On the contrary, although the rotor 13 rotating at a high speed should be controlled to the low speed side originally, when the rotor 13 instantaneously becomes a low speed rotation due to a large fluctuation of the rotational driving force due to an impact or the like, the electronic circuit 55 Determines that the rotor 13 is already rotating at a low speed, controls the rotor 13 to a higher speed side,
As a result, the speed is out of the speed control range, resulting in a time lag.

When an automatic winding mechanism for automatically winding up the mainspring 1a is provided, even if the impact is a weak one other than a strong one such as a drop, such an impact is transmitted through the rotary weight of the automatic winding mechanism. Since it will be received by the main plate and train wheel bridge,
The degree of rotation unevenness is not as great as that caused by the impact at the time of dropping, but there is a problem that it occurs more frequently in terms of number of times.

This problem can be solved to some extent by increasing the diameter and thickness of the inertia plate provided on the rotor 13 and increasing the moment of inertia of the rotor 13, but the diameter and thickness of the inertia plate can be reduced. If it is increased, the entire watch becomes thicker and larger. Further, it is necessary to increase the rotational driving force generated by the mainspring 1a, and the mainspring 1a becomes extremely large, which causes a problem that the size of the entire timepiece becomes large. Since the electronically controlled mechanical timepiece 50 is characterized in that the movement of the second hand is sweeping movement, the visibility of the second hand is improved by lengthening the second hand or clearly setting the contrast with the dial. Then, there occurs a problem that the uneven rotation of the second hand is noticeable.

An object of the present invention is to provide an electronically controlled mechanical timepiece which can suppress the rotation unevenness of the pointer such as the second hand and the like and which does not require an increase in the overall size.

[0009]

According to the present invention, a train wheel is driven by using a mainspring as an energy source, and electric power is generated in a rotating generator upon receiving rotation from the train wheel, and an electronic device driven by this electric power is generated. An electronically controlled mechanical timepiece in which a train is controlled by a circuit to control the rotation cycle of the generator so that the train wheel is braked, and includes an elastic portion that is elastically deformed by the force when the rotational driving force changes. And a biasing mechanism that is attached to at least one of the numbered wheels that compose the train wheel. In the present invention as described above, when the rotational speed of the wheel & pinion is instantaneously increased due to the fluctuation of the rotational driving force applied to the wheel & pinion, the elastic portion of the biasing mechanism provided on the wheel & pinion is deformed and deformed. The elastic force of the elastic portion serves as a restraining force and is transmitted to the train wheel, thereby suppressing acceleration of the train wheel. On the contrary, when the rotation speed of the train wheel is momentarily slowed down due to the fluctuation of the rotation driving force, the elastic portion of the biasing mechanism is deformed, and the elastic force of the deformed elastic portion serves as a restraining force. Is transmitted to, and suppresses the deceleration of the car. Here, the greater the fluctuation of the rotation speed of the wheel & pinion, the greater the amount of deformation of the elastic portion provided in the urging mechanism, and the greater the suppression force transmitted from the elastic portion to the wheel & pinion. The restraining force according to the minute is added to the train wheel. As a result, even if the electronic circuit provided in the electronically controlled mechanical timepiece allows the rotation speed of the train wheel to change within one cycle, the urging mechanism provides the restraining force according to the change in the rotation speed. In addition, since the speed fluctuation is corrected, even if the rotational driving force transmitted to the train wheel is varied, uneven rotation of the pointer such as the second hand can be efficiently suppressed.

Further, even if a large external force is applied in the direction in which the timepiece advances due to an impact due to a drop or the like and a large acceleration force is applied to the watch wheel, a suppression force for suppressing acceleration according to the acceleration force,
In other words, the driving force for deceleration is applied to the watch wheel from the urging mechanism,
Since the rotation speed of the watch wheel does not change, a large braking force is not applied to the generator by the electronic circuit,
This prevents problems such as the electronic circuit instantaneously stopping the hands such as the second hand. On the contrary, even if a large external force is applied to the timepiece in a direction that delays the clock due to an impact such as a drop and a large braking force is applied to the train wheel, the suppression force that suppresses deceleration according to this braking force, that is, the acceleration driving force is Since the urging mechanism joins the watch wheel, even with this, large rotation unevenness of the pointer such as the second hand does not occur.

Even if an automatic winding mechanism for automatically winding up a mainspring is provided, the rotational driving force easily fluctuates with a small impact that frequently occurs. However, the fluctuation of the rotational driving force is also moderated by the biasing mechanism. There is no need to worry about uneven rotation of the hands such as the second hand. It should be noted that, as the balance wheel to which the biasing mechanism is attached, not only a balance wheel provided between the barrel wheel and the rotor, but also a barrel wheel and a rotor can be adopted. If the biasing mechanism is attached, the effect of attaching the biasing mechanism can be further enhanced.

In the electronically controlled mechanical timepiece as described above, the elastic portion which also serves as an inertial portion having a predetermined weight can be adopted. In this way, the elastic portion also serves as the inertial portion, and the inertial force of the elastic portion itself increases, so that the elastic portion surely elastically deforms even when there is a slight change in the rotational driving force, and the suppression force is sufficient. Will be demonstrated.

Further, in the electronically controlled mechanical timepiece of the present invention,
The watch wheel to which the biasing mechanism is attached is preferably a rotor (rotor) of the generator. With this configuration, the biasing mechanism is attached to the rotor having the highest rotation speed, and if the radius of rotation and the weight are the same, the rotation speed is high, so that the biasing mechanism can store the same. The amount of inertial energy is increased, and the attachment effect of the urging mechanism can be made higher than that of attachment to other watch wheels.

In the electronically controlled mechanical timepiece of the invention, it is preferable that the urging mechanism includes an adjusting means for adjusting the elastic force of the elastic portion. In this way, by changing the elastic force of the elastic member by the adjusting means, it is possible to adjust for variations in manufacturing the parts and variations in the product (clock) after assembly, and the elastic force for each clock can be adjusted. Optimization can be achieved. In addition, even if the elastic force changes due to wear after long-term use, it can be expected to recover the elastic force to the initial state by adjusting the adjusting means.
Improves reliability.

Further, in the electronically controlled mechanical timepiece of the present invention, it is desirable that one end side of the elastic portion is fixed to a rotating shaft side of the train wheel and the other end side is a free end. With this configuration, since the other end side of the elastic portion is a free end, the elastic portion is elastically deformed from the one end side to the other end side reliably due to the fluctuation of the rotational driving force of the wheel & pin, and thus is easy to The structure ensures that the restraining force occurs. Further, since the elastic portion constantly changes slightly due to the rotation of the wheel & pinion, extremely weak vibration is applied to the wheel & pinion itself. Applying vibration generally lowers the friction coefficient for rotation of the train wheel, so this weak vibration lowers the friction coefficient of the support portion of the train wheel, reduces the rotational load, and lowers the drive torque of the mainspring. The durability of the mainspring is improved and the duration is extended.

On the other hand, in the electronically controlled mechanical timepiece according to the present invention, an inertia plate is coaxially and rotatably attached to the rotary shaft of the watch wheel to which the biasing mechanism is attached.
It is preferable that the rotating shaft of the wheel & pin and the inertia plate are connected to each other via the elastic portion. By doing this, the inertia plate originally provided on the train wheel is attached to the other end side, and since this inertia plate can be used as the inertia part of the biasing mechanism, the elastic part can be used for its own inertial force. Not only that, the inertial force of the inertial plate can be surely deformed, and the deterrent force against the fluctuation of the rotational driving force is surely exhibited. Further, since it is not necessary to separately provide the inertial portion, it is possible to prevent the electronically controlled mechanical timepiece from increasing in size.

In the electronically controlled mechanical timepiece of the present invention as described above, it is desirable that the elastic portion is formed of a balance spring. When such a balance spring is provided in the urging mechanism, the inner end side can be fixed to the rotating shaft of the wheel and the outer end side can be free end, and a weight can be optionally attached to this free end. Further, the inertia plate described above can be attached instead of the free end. In any case, the use of a balance spring makes it possible to lengthen the portion that is easily elastically deformed, so that elastic deformation can be performed quickly in response to fluctuations in the rotation driving force of the train wheel, and the structure is simple and responsive. An excellent biasing means is realized.

[0018]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In the following description, the same members and parts as those already described are designated by the same reference numerals,
The description will be omitted or simplified. 1 and 2 show a main part of an electronically controlled mechanical timepiece 40 according to this embodiment. The electronically controlled mechanical timepiece 40 includes a biasing mechanism 30 for the rotor 13 in the electronically controlled mechanical timepiece 50.
The electronically controlled mechanical timepiece 50 has the same structure as the electronically controlled mechanical timepiece 50 except that the biasing mechanism 30 is added.

Then, as shown in FIG. 1, the generator 2
Like the sixth wheel & pinion 12, the rotor 13 provided at 0 is rotatably provided between the main plate 2 and the train wheel bridge 3,
It is rotationally driven by the rotational driving force (rotational torque) of the mainspring 1a accelerated by the train wheel 51. For this reason, the rotor 13 is attached to each of the main plate 2 and the train wheel bridge 3.
A bearing 18 is provided at the end of the rotary shaft 13c for receiving the hoso 19, and the bearing 18 reduces the resistance when the rotor 13 rotates. In addition to the rotating shaft 13c described above, the rotor 13 includes an inertia plate 3 for accumulating a rotational driving force.
1, a pinion portion 13 that meshes with the gear portion 12a of the sixth wheel & pinion 12.
b, a permanent magnet 13e that forms a rotating magnetic field, and a balance spring 32 that is an elastic portion that forms the biasing mechanism 30 are provided.

Of these, the permanent magnet 13e is the generator 20.
It is provided at a position corresponding to the stator 22 in the longitudinal direction of the rotating shaft 13c so as to be housed between the pair of stators 22 provided in the. The pinion portion 13b is non-rotatably fixed to the rotary shaft 13c. Inertia plate 3
As shown in FIG. 2, the reference numeral 1 refers to a central portion 31a that is rotatably supported by the rotating shaft 13c, an annular portion 31b that forms an outer peripheral edge portion of the inertia plate 31, and a central portion 31a and an annular portion 31b. And a plurality of arm portions 31c connected to each other, and is rotatably attached to the rotating shaft 13c at a coaxial position.

The balance spring 32 is a light elastic body in which a thin metal elastic wire is spirally formed. Beard spring 3
An end portion (inner end) on the center side of 2 is fixed to a fixing member 33 that is non-rotatably attached to the rotating shaft 13c. An outer end (outer end) of the balance spring 32 is fixed to a fixing pin 34 attached to one arm 31c of the inertia plate 31. The fixing pin 34 is inserted into an insertion hole 31d as an adjusting means provided in the arm portion 31c. The insertion holes 31d are provided in the respective arm portions 31c, and the distances from the rotary shaft 13c are different in the respective insertion holes 31d. That is, the insertion hole 3 of the fixing pin 34
By properly selecting 1d from the three insertion holes 31d, the spring constant of the balance spring 32 can be changed and its elastic force can be adjusted.

With this balance spring 32, the rotary shaft 13
c and the inertia plate 31 are connected to each other, and when the rotation speed is changed due to the fluctuation of the rotational driving force applied to the rotation shaft 13c, the rotation shaft 13c advances or lags behind the inertia plate 31. The balance spring 32 is elastically deformable. Specifically, as shown in FIG. 2, when the rotor 13 rotates in the direction of the white arrow in the figure, when the rotor 13 normally rotates, the balance spring 32 moves from the inner end side in the winding direction. Thaw to increase the gap (to reduce the gap on the outer edge side)
The elastic plate 31 is slightly elastically deformed, and the inertia plate 31 is slightly returned in the direction opposite to the rotation direction of the rotor 13 to a position where the elastic force of the balance spring 32 and the weight of the inertia plate 31 are balanced. As a result, the inertia plate 31 shifts to the side that lags the rotation phase of the rotor 13, and rotates together with the rotor 13 at the same speed with the rotation phase being deviated. Then, when the rotational speed of the rotor 13 is rapidly increased due to the fluctuation of the rotational driving force, the balance spring 32 is elastically deformed so that the inner end side can be released further, that is, the rotational phase of the inertia plate 31 is further delayed, A restraining force is generated by the amount of this elastic deformation, a rapid increase in the speed of the rotor 13 is suppressed, and the speed change becomes gentle. On the contrary, when the rotational speed of the rotor 13 is rapidly reduced due to the fluctuation of the rotational driving force, the inner end side of the balance spring 32 is elastically deformed so that the rotational phase of the inertia plate 31 is advanced, and this elastic deformation is performed. By the amount, a restraining force in the opposite direction to that described above is generated, and abrupt deceleration of the rotor 13 is restrained, so that the speed change also becomes gentle.

Therefore, the urging mechanism 30 of this embodiment has a balance spring 32 as an elastic portion which is elastically deformed by a predetermined force.
And an inertia plate 31 having a predetermined weight, and the balance spring 32 and the inertia plate 31 alleviate fluctuations in the rotational driving force applied to the rotor 13. However, the inertia plate 31 rotatably supported by the rotating shaft 13c is provided with a supporting member 35 fixed to an intermediate portion of the rotating shaft 13c and a fixing member 33 fixing the center end of the balance spring 32. It is sandwiched and cannot move in the axial direction of the rotary shaft 13c. Further, the electronically controlled mechanical timepiece 40 is provided with an automatic winding mechanism (not shown) for winding the mainspring 1a by a rotary weight (not shown). The electronically controlled mechanical timepiece according to the present invention may have specifications such as a chronograph and a timer in addition to the current time display.

According to this embodiment, the following effects are obtained. (1) That is, by attaching the biasing mechanism 30 to the rotor 13, the rotor 1 within one cycle of the rotor 13
If the rotation speed of the rotor 13 is not controlled and the rotation speed of the rotor 13 is momentarily increased by the time the rotor 13 makes one rotation, the balance spring 32 of the biasing mechanism 30 is deformed and the deformed balance spring 32 is deformed. However, since the inertial force stored in the inertia plate 31 is transmitted to the rotor 13 as a suppressing force, the acceleration of the rotor 13 can be suppressed. vice versa,
If the rotation speed of the rotor 13 is momentarily slowed by the time the rotor 13 makes one rotation, the urging mechanism 3
The balance spring 32 of 0 is deformed, and the deformed balance spring 32 transmits the inertial force stored in the inertial portion to the rotor 13 as a suppressing force, so that the deceleration of the rotor 13 can be suppressed. Here, the greater the amount of change in the rotation speed of the rotor 13, the greater the balance spring 3 provided in the urging mechanism 30.
The amount of deformation of No. 2 becomes large, and the suppressing force transmitted from the inertial plate 31 to the rotor 13 also becomes large, so that the suppressing force corresponding to the fluctuation of the rotation speed can be applied to the rotor 13.
Therefore, even if the electronic circuit 55 provided in the electronically controlled mechanical timepiece 40 allows the rotation speed of the rotor 13 to fluctuate within one cycle, the biasing mechanism 30 exerts a suppression force according to the fluctuation of the rotation speed. Since the speed variation is corrected in addition to the rotor 13, even if the rotational driving force transmitted to the rotor 13 varies, the rotation unevenness of the pointer such as the second hand can be efficiently suppressed.

(2) Moreover, due to the impact of dropping,
Even if the rotor 13 receives a large external force in the direction in which the electronically controlled mechanical timepiece 40 advances and a large acceleration force is applied to the rotor 13, a restraining force for suppressing the acceleration in accordance with the acceleration, that is, a deceleration driving force is applied from the biasing mechanism 30. Join the rotor 13,
Since the rotation speed of the motor does not change, a large braking force is not applied to the generator 20 by the electronic circuit 55, which causes a problem such as the electronic circuit 55 momentarily stopping the pointer such as the second hand. It can be prevented. vice versa,
Even if the electronically controlled mechanical timepiece 40 receives a large external force in the delaying direction and a large braking force is applied to the rotor 13 due to an impact caused by a drop or the like, a suppression force that suppresses deceleration according to the braking force, that is, an acceleration drive. Since the force is applied to the rotor 13 from the biasing mechanism 30, this also prevents the occurrence of large rotation unevenness of the pointer such as the second hand.

(3) Further, when an automatic winding mechanism for automatically winding the mainspring 1a is provided, the rotational driving force easily changes due to frequent small impacts.
Since such a variation of the rotational driving force can be alleviated by the biasing mechanism 30, it is possible to prevent the rotation unevenness of the hands such as the second hand from occurring.

(4) Further, the urging mechanism 30 is attached to the rotor 13, which is the wheel with the highest rotation speed, and the inertia plate 31 of the urging mechanism 30 has the same rotation radius and weight.
Since the maximum amount of inertial energy that can be stored in the wheelchair is set, the mounting effect of the urging mechanism 30 can be made higher than that of mounting the urging mechanism 30 in another wheel.

(5) In addition, the inertia plate 31 is coaxially and rotatably attached to the rotary shaft 13c of the rotor 13, and the inertia plate 31 and the rotary shaft 13c are connected to each other by a balance spring 32 to form the inertia plate 31 and the balance spring. Since the biasing mechanism 30 is formed by including 32, the inertia plate 31 of the rotor 13 is
The urging mechanism 30 can be used as an inertial portion, and it is not necessary to separately provide an inertial portion. If only the balance spring 32 is newly provided, the urging mechanism 30 can be realized.

(6) Since the light balance spring 32 made of thin metal elastic wire or the like is adopted, the biasing mechanism 30
The electronically controlled mechanical timepiece 40 does not grow even if the
It is possible to reduce the size and weight of the electronically controlled mechanical timepiece 40.

(7) Moreover, even if a thin balance spring 32 is newly added to the rotor 13, the viscous resistance of the air during rotation of the rotor 13 does not increase.
2 does not hinder the rotation of the inertia plate 31. For this reason,
Even if the biasing mechanism 30 is provided, the load torque required to rotate the rotor 13 does not increase, and the electronic control mechanical clock 40 is operated by the mainspring 1a in which a predetermined mechanical energy is stored. The operation duration of the mechanical timepiece 40 can be sufficiently secured.

(8) The balance spring 32 has three insertion holes 31 in which the fixing positions of the fixing pins 34 attached to the outer end side are set.
Since the elastic force can be adjusted by selecting from d and inserting it, it is possible to adjust the elastic force with respect to variations in manufacturing of the parts and variations after assembly of the electronically controlled mechanical timepiece 40. It is possible to optimize the elastic force. Further, even when the elastic force changes due to wear after long-term use, the elastic force can be adjusted by shifting the insertion position of the fixing pin 34, so that the elastic force can be restored to the initial state and reliability can be improved. Can be improved.

(9) Since the inertia plate 31 provided on the rotor 13 is attached to the free end side of the balance spring 32, even if the balance spring 32 is lightweight and has a small inertia weight, The balance spring 32 can be surely deformed by the inertial force of the plate 31, and the restraining force against the fluctuation of the rotational driving force can be surely exhibited.
Further, since the inertia plate 31 is originally a component of the rotor 13, it is not necessary to attach a weight to the free end side of the balance spring 32 to increase the inertia weight, and the electronically controlled mechanical timepiece 40 can be made large or large. It is possible to prevent weighting.

(10) Since the balance spring 32 has a long elastically deformable portion, it can be elastically deformed flexibly with respect to changes in the rotational driving force of the rotor 13, and has a simple structure and responsiveness. An excellent biasing mechanism 30 can be realized.

(11) Since the rotor 13 has the inertia plate 31 and is the heaviest in the train wheel and has a great influence on the load, the load on the rotor 13 is reduced by attaching the biasing mechanism 30 to the rotor 13. Therefore, the durability of the mainspring 1a and the duration of the electronically controlled mechanical timepiece 40 can be extended.

(12) The rotation speed of the rotor 13 and the inertia plate 31 is fast (for example, 8 Hz), and it is impossible to visually judge the degree of change in the rotation speed. However, in this embodiment, when the rotation speed of the rotor 13 is high, the clearance on the outer end side of the balance spring 32 is small, and when the rotation speed is low, on the contrary, the clearance on the inner end side is small. This state can be visually recognized, and the degree of rotation of the rotor 13 can be easily determined. Thereby, the operating state of the biasing mechanism 30 can be easily inspected after the electronically controlled mechanical timepiece 40 is completed, and the reliability of the electronically controlled mechanical timepiece 40 can be improved.

(13) In the case of a chronograph specification or timer specification timepiece in which the pointer is swept, it is required to read below the scale that cannot be displayed by the step movement of a normal quartz timepiece or mechanical timepiece. Therefore, it is a particularly effective effect in the electronically controlled mechanical timepiece 40 of the present embodiment that sweeps hands to prevent the uneven rotation, and the electronically controlled mechanical timepiece 40 is suitable for chronograph specifications, timer specifications, etc. Can be used for.

The present invention is not limited to the above-described embodiment, and includes improvements and modifications thereof within the range in which the object of the present invention can be achieved. For example, in the above embodiment, the inertia plate 31 is attached to the outer end side of the balance spring 32, but a weight or the like may be attached to the outer end side to increase the inertia weight of the balance spring 32. Specifically, as shown in FIG. 3, one end of the balance spring 32 is fixed to the rotating shaft 13c of the rotor 13 which is a wheel and the other end is made a free end, and the other end serves as an inertia part. A biasing mechanism 30a to which the weight 36 is fixed can also be adopted.
In addition, in FIG. 3, the inertia plate 31 is non-rotatably fixed to the rotary shaft 13c of the rotor 13.

In the case of the above construction, the rotor 13 rotates in the direction of the white arrow in the figure, and the balance spring 32 during normal rotation of the rotor 13 is slightly loosened at the outer end side in the winding direction. Elastically deformed to open, and the balance spring 32
Maintains a balance between its own inertial force and its elastic force.
The rotor 13 and the balance spring 32 rotate at the same speed in this state. When the rotational speed of the rotor 13 is rapidly increased due to the fluctuation of the rotational driving force, the balance spring 32 can be unwound, that is, the balance spring 32.
Elastically deforms so that the diameter dimension of the rotor becomes large, and a restraining force is generated by this elastic deformation to suppress the rapid speedup of the rotor 13 and the speed change becomes gentle. On the contrary, when the rotational speed of the rotor 13 is suddenly decelerated due to the fluctuation of the rotational driving force, the balance spring 32 is elastically deformed so that the balance spring 32 is wound up, that is, the diameter dimension of the balance spring 32 is reduced. By the amount, a restraining force in the opposite direction to that described above is generated, and abrupt deceleration of the rotor 13 is restrained, so that the speed change also becomes gentle.

With this configuration, the following effects can be obtained due to its peculiar structure. (14) The biasing mechanism 30a can be realized with the simplest structure, and even if the biasing mechanism 30a is provided, the electronically controlled mechanical timepiece timepiece can be further reduced in size and weight.

(15) Since the inner end side of the balance spring 32 is fixed to the rotating shaft 13c, while the outer end side is the free end, the balance spring 32 is changed by the fluctuation of the rotational driving force of the rotor 13. It is possible to surely elastically deform from the inner end side to the outer end side, and it is possible to reliably generate the suppressing force with a simple structure.

(16) Since the outer end side of the mainspring 32 is a free end, the balance spring 32 can be constantly slightly changed by the rotation of the rotor 13, and extremely weak vibration can be continuously applied to the rotor 13 itself. . Therefore, this weak vibration can reduce the friction coefficient of the groove 19 of the rotor 13 and reduce the rotational load of the rotor 13. As a result, the drive torque of the mainspring 1a is reduced, so that the durability of the mainspring 1a can be improved and the duration of the electronically controlled mechanical timepiece can be further extended.

(17) Further, since the diameter of the balance spring 32 becomes larger or smaller depending on the change of the rotation speed, the change in the diameter of the balance spring 32 can be easily visually recognized. The degree of change in rotation speed can be easily determined. Therefore, although the configuration is different,
The effect of (12) can be similarly obtained.

Further, the urging mechanism is not limited to the one having a spiral spring formed in a spiral shape, but may be one having a leaf spring as an elastic portion. Specifically, FIG.
As shown in FIG. 7, a long and thin plate-shaped plate spring 37 is adopted as an elastic portion, and one end of the plate spring 37 is a rotor 13 which is a wheel.
Urging mechanism 30b fixed to the rotary shaft 13c of the same and the other end of the leaf spring 37 fixed to one arm portion 31c of the inertia plate 31.
Can also be adopted. In addition, in FIG. 4, the inertia plate 31 also serves as the inertia portion of the biasing mechanism 30b, and the rotor 1
It is rotatably supported by the rotary shaft 13c of the No. 3.

Further, the urging mechanism is not limited to the one attached to the rotor which is the rotor of the generator, but may be the one attached to another wheel. In this case, a balance spring having a certain inertia weight is secured by forming a metal elastic wire having a certain weight in a spiral shape, and the balance spring is used as both an elastic part and an inertia part. A force structure can also be adopted. Specifically, as shown in FIG. 5, one end of the balance spring 38 is attached to the sixth wheel 12
It is also possible to employ a biasing mechanism 30c that is fixed to the rotary shaft 12c and has the other end as a free end. Here, the balance spring 38 is an elastic body in which inertia weight is secured by forming a metal elastic wire having a certain weight in a spiral shape, and serves as both an elastic portion and an inertia portion. . The structure as described above is suitable for a stationary clock or clock because gravity acts in a fixed direction. Further, the winding mechanism of the mainspring is not limited to the above-described automatic winding mechanism, but may be a manual winding mechanism that winds the mainspring by manually rotating the crown or the like. And
The urging mechanism is not limited to one having a metal elastic portion such as a balance spring, but the same effect can be obtained even if a fluid (liquid, gas) or an elastic portion made of a non-metallic material such as synthetic resin is used. .

[0045]

As described above, according to the present invention,
It is possible to further suppress the uneven rotation of the pointer such as the second hand without increasing the size of the whole.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of the present invention.

2A and 2B are a plan view and a cross-sectional view showing an urging mechanism of the embodiment.

FIG. 3 is a diagram corresponding to FIG. 2 showing a modified example of the present invention.

FIG. 4 is a diagram corresponding to FIG. 2 showing a different modification of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1 showing a further modified example of the present invention.

FIG. 6 is a plan view showing an entire electronically controlled mechanical timepiece according to a conventional example.

7 is a cross-sectional view showing the electronically controlled mechanical timepiece shown in FIG.

[Explanation of symbols]

1 ... barrel car, 1a ... mainspring, 13 ... rotor, 13c ...
Rotor rotation shaft, 20 ... Generator, 30, 30a to 30c
... biasing mechanism, 31 ... inertia plate, 31d ... insertion hole as adjusting means, 32 ... balance spring as elastic portion, 36 ...
Weights, 37 ... Leaf springs as elastic parts, 38 ... Balancing springs that also serve as elastic parts and inertia parts, 40 ... Electronically controlled mechanical timepieces, 51 ... Wheel trains, 55 ... Electronic circuits.

Claims (7)

[Claims] 1. A power train is driven by a mainspring as an energy source, and electric power is generated in a rotating generator by receiving rotation from the train wheel, and an electronic circuit driven by this electric power rotates a rotation cycle of the generator. In an electronically controlled mechanical timepiece in which the train wheel is braked to adjust the speed, an urging mechanism including an elastic portion elastically deformed by the force when the rotational driving force fluctuates is used. An electronically controlled mechanical timepiece, characterized in that the urging mechanism is attached to at least one of the plurality of wheels forming the train wheel. 2. The electronically controlled mechanical timepiece according to claim 1, wherein the elastic portion also serves as an inertial portion having a predetermined weight. 3. The electronically controlled mechanical timepiece according to claim 1, wherein the watch wheel to which the biasing mechanism is attached is a rotor of the generator. Mechanical clock. 4. The electronically controlled mechanical timepiece according to any one of claims 1 to 3, wherein the urging mechanism includes an adjusting means for adjusting an elastic force of the elastic portion. Electronically controlled mechanical clock. 5. The electronically controlled mechanical timepiece according to any one of claims 1 to 4, wherein one end side of the elastic portion is fixed to a rotating shaft side of the train wheel, and the other end side thereof is a free end. An electronically controlled mechanical watch characterized by 6. The electronically controlled mechanical timepiece according to any one of claims 1 to 4, wherein an inertia plate is coaxial and rotatable with respect to a rotary shaft of the wheel having the biasing mechanism attached thereto. An electronically controlled mechanical timepiece, wherein the rotary shaft of the wheel & pin and the inertia plate are connected to each other through the elastic portion. 7. The electronically controlled mechanical timepiece according to any one of claims 1 to 6, wherein the elastic portion is formed of a balance spring.