JPH0823594B2 - Watch pointer mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure of a pointer mechanism of an analog timepiece having a smooth hand movement.

[Conventional technology]

As shown in FIG. 2, the conventional timepiece mechanism for a timepiece stores the rotational energy of the stepping motor rotor 11 which rotates intermittently by the magnetic attraction force of the drive magnet 14 and the driven magnet 15, and the driven magnet which interlocks with the pointer 24. The space between the fixed cavities 25 is filled with the viscous fluid 20, and the driven magnet is braked by the shearing force of the viscous fluid and gradually rotated to enable smooth hand movement. Further, as in Japanese Patent Laid-Open No. 54-46076, a system has been proposed in which the ratchet mechanism is used to convert to continuous step feed, or the continuity is improved by solid friction.

[Problems to be solved by the invention]

However, in the above-described conventional technique, the portion that accumulates the rotational energy and the portion that gradually releases the rotational energy are integrally formed. Also changes and does not become a smooth hand movement, and if the gap between the driven magnet and the cavity is changed to change the viscous resistance, the magnetic attraction force also changes. In addition, the attraction force or repulsion force in the axial direction changes due to the phase shift between the drive magnet and the driven magnet, and it moves up and down by the clearance provided to facilitate rotation, thus preventing viscous resistance and smooth hand movement. It was Furthermore, since the driven magnet rotates only by the amount of rotation of the drive magnet, its rotation speed and rotation angle are small, and the frictional force of the sliding portion is unstable and easily affected by it.
Since a high-viscosity viscous fluid is required, it is difficult to manufacture and it is easily affected by temperature.

On the other hand, in the example of Japanese Patent Laid-Open No. 54-46076, the movement is basically step movement, and only improvements have been made so that it looks continuous. Therefore, in order to make it look smooth, the ratchet part is driven at high speed. However, it is necessary to decelerate and move the hands, which is not only low in durability but also difficult to reduce current consumption and downsize.

Therefore, the present invention solves such a problem, and an object thereof is to provide a timepiece mechanism for a timepiece for smoothly moving hands by independently configuring a potential energy storage means and a braking means utilizing viscous resistance. To provide.

[Means for solving problems]

The timepiece pointer mechanism of the present invention has a converter 3 that rotates intermittently according to a reference signal, and drives the display mechanism 7 including a display wheel having the pointer by the converter to keep time. In the mechanism, storage means 4 having a gear for storing the rotational energy of the converter as potential energy and transmitting the stored potential energy to the display mechanism, and smoothing the potential energy by viscous friction tendency of viscous fluid And a control means 5 for controlling to gradually release as motion, the control means having a gear and being configured to receive the viscous friction resistance on a rotation shaft of the gear, and the control means , The storage means and the display wheel are provided independently of each other, and are arranged so as not to overlap the display wheel in plan view, and the teeth of the storage means are provided. It is characterized in that a gear of the control means is engaged so that a braking torque is applied to the vehicle.

[Action]

The timepiece pointer mechanism of the present invention stores the intermittent rotational energy generated in the converter as potential energy due to the bending force of the spring, the magnetic attraction force, etc., and controls it by a damper using viscous resistance. The speed is controlled to drive the train wheel, enabling smooth hand movement.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a timepiece mechanism for a timepiece according to the invention, in which 1 is an oscillator such as a crystal oscillator for generating a reference signal, 2 is a stepping motor or the like which divides the reference signal of the oscillator. The clock circuit 4 for generating a signal for intermittently driving the converter 3 of FIG. Control means 6 converts the rotational movement into a smooth rotational movement, and 6 is a speed change mechanism for changing the rotational speed controlled by the control means 5 to drive the pointer 7. In such a configuration, the accumulating means and the control means can be configured separately, so that it is easy to combine the preferable characteristics, and by changing only the characteristics of the control means, it is possible to select the hand movement form from step movement to sweep movement. is there.

FIG. 3 is a sectional view showing an embodiment of the present invention. 10 is a main plate, 11 is a rotor of a stepping motor, 12 is a rotor gear that rotates integrally with the rotor 11, 13 is a drive magnet that engages with the rotor gear 12. Reference numeral 14 is a drive gear, and 16 is a driven gear having a drive magnet 14 and a driven magnet 15 attracted or repelled by a magnetic force. The drive magnet 14 and the driven magnet 15 constitute the storage means 4 and rotate by a rotation angle and a magnetic force. It is storing energy. Reference numeral 17 denotes an oil rotor gear that rotates integrally with the oil rotor 19 and the oil rotor true 18 immersed in the viscous fluid 20 and suppresses the driven gear 16 from rapidly rotating due to a viscous load. Reference numeral 21 denotes a cap for sealing the viscous fluid, which includes an oil rotor gear 17, an oil rotor true 18, an oil rotor 19, a viscous fluid 20,
The cap 21 constitutes the control means 5. 22 is the fifth car,
Reference numeral 23 is a fourth wheel, which changes the speed of smooth rotation of the driven gear 16 and drives the pointer 24. Reference numeral 25 is a train wheel receiver that supports the handle portion such as the gear described above.

In such a structure, the rotor 11 is regularly driven, and the second hand 24 smoothly follows the phase with a slight delay in phase to perform continuous hand movement. Further, since the oil rotor 19 is rotated by being increased from the driven gear 16, the oil rotor 19 can be downsized if it has the same viscosity, and if it is of the same type, a low-viscosity fluid that can be easily assembled can be used.

〔The invention's effect〕

As described above, according to the present invention, the intermittent rotary motion generated in the converter can be converted into continuous rotary motion by the independent accumulating means and control means. The dimensions and characteristics can be set independently of each other without affecting each other, and therefore, there is an effect that manufacturing is extremely easy and sweep hand movement can be achieved with high mass productivity.

Further, the control means is provided independently of the accumulating means and the display wheel, and the control means, the accumulating means, and the display wheel are arranged more freely by arranging them so as not to overlap the display wheel in a plane. The timepiece can be made thinner.

Further, the braking torque can be reliably applied to the accumulating means by engaging the gear forming the control means with the gear of the accumulating means to apply the braking torque.

And, since the braking torque is not directly applied to the display vehicle that has the pointer most sensitive to the force from the outside, even if the braking torque is uneven, the movement of the pointer is not greatly reflected and a stable continuous operation is always performed. It is possible to realize hand movement.

Furthermore, the control means has a structure in which the rotating shaft of the gear receives viscous frictional resistance and does not generate braking torque due to friction between solids. It is possible to obtain a timepiece pointer mechanism that can prevent a row from being affected and can perform stable sweep hand movement for a long period of time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a timepiece pointer mechanism of the invention. FIG. 2 is a sectional view of a conventional timepiece mechanism for a timepiece. FIG. 3 is a cross-sectional view showing an embodiment of a timepiece indicating mechanism of the invention. 1 ... Oscillator 2 ... Clock circuit 3 ... Converter 4 ... Accumulation method 5 ... Control means 6 ... Transmission mechanism 7 ... Display mechanism 13 ... Drive gear 14 ... Drive magnet 15 ... Driven magnet 16 …… driven gear 17 …… oil rotor gear 18 …… oil rotor true 19 …… oil rotor 20 …… viscous fluid 21 …… cap 24 …… pointer

Claims (1)

[Claims] 1. A timepiece pointer mechanism for driving a display mechanism 7 including a display wheel having a pointer by means of the converter 3 which rotates intermittently in response to a reference signal, for timekeeping. Accumulation means 4 having a gear for accumulating the rotational energy of the converter as potential energy and transmitting the accumulated potential energy to the display mechanism, and the potential energy gradually as smooth rotational motion by viscous frictional resistance of viscous fluid. And a control means 5 for controlling the discharge, wherein the control means has a gear and is configured to receive the viscous friction resistance on a rotation shaft of the gear, and the control means is the storage means. And a wheel which is provided independently of the display wheel and which is arranged so as not to overlap the display wheel in a plane and brakes the gear of the accumulating means. A timepiece mechanism for a timepiece, characterized in that a gear of the control means is engaged so as to apply a torque.