JP2563822B2 - Electronic clock - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a train wheel structure of an electronic timepiece for realizing a smooth sweep hand movement.

[Prior Art] In a conventional electronic timepiece, a time delay is created by the elastic coupling member 10 shown in FIG.
By the action of 18 and ratchet, the subsequent rotation of the train wheel is converted into continuous rotation. In addition, Japanese Examined Sho 56-
There has also been proposed a method in which a member having a pointer attached thereto is directly immersed in a viscous fluid as in No. 41863.

[Problems to be Solved by the Invention]

However, in the prior art of the prior art, as shown in FIG. 2, the fourth wheel & pinion 15 fitted with the pointer is rotationally driven from the elastic member 10 as the accumulating means through the inertia wheel 18 as the braking means. No. 4 wheel because the rotating load of No. 4 wheel 15 itself is small
There is a problem that backlash in the meshing of the 15th and 5th pinion 8 and the tilting of the shaft due to the mounting backlash cause deviation and variation of the pointer. This deviation or variation of the pointer is particularly noticeable in the sweep hand movement, so that it is very unsightly and impairs the marketability.

On the other hand, in the method of directly immersing the member on which the pointer is attached in the viscous fluid, the viscous fluid container thickens the part that drives the hour, minute, and second hands, and the number of rotations of the pointer is not specified. Therefore, the size of the container for the viscous fluid and the selection of the viscosity of the viscous fluid are greatly restricted.In addition, the support of the member on which the pointer is attached tends to be unstable. It is difficult to put such a structure to practical use because of problems such as unevenness in hand movement due to fluctuations in the driving load.

Therefore, the present invention is to solve the above problems, and the problem is that by improving the train wheel structure including the accumulating means and the braking means, a smooth sweep hand movement is possible and the pointer is stable, and further The purpose of the present invention is to provide an electronic timepiece that can be easily made thin and compact.

[Means for Solving the Problem] The present invention is an electronic timepiece having an accumulating means for accumulating intermittent rotational energy and a braking means for controlling the rotational energy to smoothly drive the hands, and a braking operation from the accumulating means. One of the gear trains arranged in the rotation transmission path leading to the means is used as an output gear for extracting the rotational driving force of the pointer, and the output gear is a gear for transmitting the restoring torque received from the accumulating means and the braking means. The gears for transmitting the load torque received from the gears mesh with each other.

〔Example〕

FIG. 1 is a plan view showing a first embodiment of an electronic timepiece according to the invention, and FIG. 3 is a sectional view thereof. In the present embodiment, the balance spring 10 is used as the storage means for the rotational energy, and the oil rotor 14 that receives the viscous load of the viscous fluid 17 is used as the braking means for the rotational energy. Reference numeral 21 is a base plate, 22 is a train wheel bridge, and 1 is a coil for generating a magnetic field for driving the rotor 5 via the stator 4 and the magnetic core 2. The coil 1 is fixed by a screw 3, and drives a balance spring 11 and a balance spring wheel 9 connected by a balance spring 10 through a rotor pinion 6, 5 gears 7, 5 pinion 8, and an idler a12. The fourth wheel & pinion 15 engaged with the pointer 16 is driven via.

On the other hand, the oil rotor 14 having the load torque based on the viscous friction with the cavity 19 is the oil rotor pinion 13,
The fourth wheel 15 is braked via the idler b23, and the oil rotor 1
4 is supported at two points by the train wheel bridge 22 and the cavity 19. Here, the balance spring wheel 9 and the balance spring wheel 11 are coaxially and rotatably attached to each other.
2 and the idler b23 are rotatably attached to the idler true 24 by at least the amount of backlash of the meshing engagement with the fourth wheel & pinion 15.

When the rotor 5 is driven intermittently in such a structure, the hairspring 11 has an oil rotor 14 having a load torque depending on the speed via the idlers a, b and the fourth wheel & pinion 15.
Braked by Therefore, I wonder if the hairspring is 11
Is smoothly and continuously rotated by the hairspring 10 at a rotation speed commensurate with the elastic restoring force, that is, at a speed within a certain range commensurate with intermittent motion. Reference numeral 20 denotes a regulating lever, which can stop the movement of the train wheel while keeping the rotation angle difference in the hairspring by regulating the smoothly moving portion beyond the hairspring mainspring 11. In addition, the train wheel member from the hairspring to the oil rotor (whether the hairspring, the idler a, the fourth wheel, the idler b, the oil rotor, etc.) always applies the load of the oil rotor 14 to the force transmission path. The backlash is removed by the force of, and the instruction does not shift or rattle.

FIG. 4 is a plan view showing a second embodiment of the electronic timepiece of the invention. Since the idler a12 and the idler b23 are arranged in a plane, there are problems such as friction when sliding coaxially. Absent.

FIG. 5 is a plan view showing a third embodiment of the electronic timepiece of the invention, in which the fourth wheel & pinion 15 and the oil rotor pinion 13 are directly engaged with each other, so that the idler 23 is unnecessary.

FIG. 6 is a plan view showing a fourth embodiment of the electronic timepiece of the invention, in which the hairspring 1 and the fourth wheel & pinion 15 are directly engaged with each other, so that the idler a12 is unnecessary.

FIG. 7 is a plan view showing a fifth embodiment of the electronic timepiece of the invention, in which power is transmitted from the rotor to the rotor pinion and the balance spring wheel through the fifth wheel. Since the balance spring kana 11 and the 4th wheel 15 and the oil rotor kana 13 and the 4th wheel 15 are directly engaged with each other, the number of wheel train parts can be reduced.

Figure 8 shows hairspring main body 11 to oil rotor 13
It is an explanatory view showing the meshing of the teeth of the train wheel for the smooth hand movement to reach the first driving wheel 50, the second driving wheel 51, and the driven wheel.
52 is, for example, beard mainspring 11, idler
It corresponds to a12, 4th wheel 15, or idler a12, 4th wheel 15, idler b23. Here, the first of the second drive vehicle 51
The driven tooth 51b of the driven wheel 50 is driven by the first driving tooth 50a of the first driving wheel 50, and the second driven tooth 52b of the driven wheel 52 is driven by the second driving tooth 51a of the second driving wheel 51. It At this time, the transmission torque ratio in each meshing suddenly changes at the beginning and the end of meshing, and the restoring force of the balance spring 10 and the oil rotor.
It may lose balance with the viscous load of 14 and cause uneven rotation. Therefore, when the driving teeth 50a and the driven teeth 51b and the driving teeth 51a and the driven teeth 52b are meshed at the central portions of the teeth, respectively, when uneven rotation occurs, both meshes are displaced and the fluctuation is large. In the electronic timepiece of the invention, as shown in the drawing, the first drive tooth 50a is at the center of the tooth, and the second drive tooth 51a is sent at the tip of the tooth. It reduces fluctuations when the occurrence of. Although only two meshing portions are described in the explanation of FIG. 8, it is needless to say that even if there are more meshing portions, it is necessary to shift the timings of the start of meshing and the end of meshing. For example, in the example of FIG.
It is necessary to shift the respective timings for the meshing of the four hairspring main kana 11 and idler a12, idler a12 and fourth wheel 15, fourth wheel 15 and idler b23, idler b23 and oil rotor kana 13 in total.

Fig. 9 shows hairspring main body 11 to oil rotor kana 13
FIG. 10 is an explanatory view showing an example of a train wheel for performing smooth hand movement, and FIG. 10 is a graph showing an example of the transmission torque ratio of the tooth profile in FIG. 9. In FIG. 10, the vertical axis represents the transmission torque ratio, the horizontal axis represents the meshing position, and the left end starts meshing.
The right end is the end of meshing. A curve corresponding to the case where the driving tooth 53 has a sharp tip as shown by a solid line corresponds to 55, and a curve when the toothing is rounded with a radius ρk as shown by a broken line corresponds to 56. When the addendum is rounded, the tooth flank 54a of the driven tooth 54 is driven while sliding, so that the transmission torque ratio suddenly changes like 56a. In FIG. 10, the curve 56 is ρk = 0.05 mm, the change in the transmission torque ratio in this case is about 10%, and when ρk = 0.05 mm is exceeded, the change amount sharply increases as shown by the curve 57. Uneven rotation becomes noticeable. Also, the shaded portion of 53b is the proper tooth profile range, and within this range, the transmission torque ratio is the curves 55 and 56.
Exists between. Therefore, in the present invention, ρk =
The shape is set in the range smaller than 0.05 mm.

According to the present embodiment, in addition to the effect peculiar to the present invention described later, the hairspring can store rotational energy corresponding to a plurality of intermittent movements, and the oil rotor rotates according to the rotational speed. Since a load is applied, stable continuous rotation of the pointer can be obtained. Further, since the oil rotor is supported at two points and the oil rotor itself is formed separately from the pointer, it is possible to prevent tilting of the pointer and uneven hand movement. Further, the combination of the hairspring and the oil rotor allows smooth and continuous movement even when the vehicle is subjected to rocking or impact or when the regulation is released, so that a very preferable sweep property can be obtained.

Although the embodiment of the present invention has been described with respect to a typical structure, the intent of the present invention is that the pointer 16 is fitted to the fourth wheel of the train wheel member from the accumulating means to the braking means. However, the configuration and arrangement thereof are not limited to the present embodiment.

Further, in order to generate intermittent energy, an actuator using electrostriction or the like may be used instead of using a magnetic field as in the present embodiment, or if the accumulating means stores intermittent energy. Not limited to the hairspring, another elastic member or a magnetic material having a magnetic attraction force may be used.

Further, the meshing position and tooth profile of the tooth profile are applicable to all electronic timepieces that continuously move hands, and are not limited to the embodiments of the present invention.

〔The invention's effect〕

As described above, according to the present invention, one gear of the train wheel arranged in the rotation transmission path from the accumulating means to the braking means is used as the output gear for extracting the rotational driving force of the pointer, and the output gear Since the gear that transmits the restoring torque received from the accumulating means and the gear that transmits the load torque received from the braking means are meshed with each other, the output gear can always rotate without backlash, and Misalignment and rattling can be reduced. Further, since the accumulating means, the output gear, and the braking means can be arranged in different plane positions without overlapping each other, the timepiece can be made thin.

[Brief description of drawings]

FIG. 1 is a plan view showing the internal structure of a first embodiment of an electronic timepiece according to the present invention. FIG. 2 is a plan view showing the internal structure of a conventional electronic timepiece. FIG. 3 is a sectional view of the internal structure shown in FIG. FIG. 4 is a plan view showing the internal structure of the second embodiment of the present invention. FIG. 5 is a plan view showing the internal structure of the third embodiment of the present invention. FIG. 6 is a plan view showing the internal structure of the fourth embodiment of the present invention. FIG. 7 is a plan view showing the internal structure of the fifth embodiment of the present invention. FIG. 8 is an explanatory view showing the meshing state of the teeth of the train wheel in each embodiment of the present invention. FIG. 9 is an explanatory view showing an example of the tooth profile of the train wheel in each embodiment of the present invention. FIG. 10 is a graph showing an example of the transmission torque ratio of the tooth profile shown in FIG.

Claims (1)

(57) [Claims] 1. An electronic timepiece having an accumulating means for accumulating intermittent rotation energy and a braking means for controlling the rotation energy to drive a pointer smoothly, in a rotation transmission path from the accumulation means to the braking means. One of the gear trains provided is an output gear that extracts the rotational driving force of the pointer, and a gear that transmits the restoring torque received from the accumulating means and a load that is received from the braking means are output gears. An electronic timepiece characterized in that it is meshed with a gear that transmits torque.