JPS6143262Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention The invention relates to a mechanism for preventing the second hand of a quartz watch from wobbling. Furthermore, to be more specific, there is a new method for preventing the hand runout of a new crystal clock that prevents the runout of the second hand, which is attached to the shaft of the fourth gear that is engaged with and driven by the step motor, without degrading the performance of the step motor. It is about the mechanism.

(2) Prior art and its problems Conventionally, in quartz watches that have a drive device using a step motor, the vibration of the second hand attached to the fourth gear due to the rotational vibration of the step motor is a fatal problem. Various measures have been taken to prevent this.

For example, as shown in FIG. 1, a presser spring 4 is interposed on the shaft of the fourth gear 3, which is driven by engaging with the rotor 2 of the step motor 1, to stop the vibration of the fourth gear 3. This structure prevents the second hand (not shown) attached to the number gear 3 from wobbling, and also uses a presser spring similar to the one described above to hold down the axes of the rotor 2 and the fourth gear 3 together, thereby preventing the hand from running out. A structure to prevent vibration was known. Furthermore, as another embodiment, the fourth gear 3
There is also a known method of suppressing the vibration of the fourth gear 3 and preventing the needle from swinging by applying grease to the engagement portion between the pinion and the rotor pinion 2a. motor 1
A mechanical load is added by the presser spring 4, which significantly reduces the performance of the step motor 1. Furthermore, the spring pressure of the presser spring 4 causes wear on the sliding parts, and furthermore, the needle runout effect tends to change over time due to difficulty in controlling the dimensions of the presser spring 4.

In addition, the latter method of applying grease has problems such as deterioration of the properties of the grease itself over time or the tendency for dust to adhere to it, and both have the drawback that it is difficult to ensure reliable and effective prevention of needle runout. It was hot.

(3) Purpose of the present invention The present invention was devised in view of the above-mentioned drawbacks, namely, without reducing the original performance of the step motor and without having sliding parts that are subject to mechanical loads. To provide a mechanism for preventing hand shake of a quartz watch that is reliable and does not change over time by extremely effectively regulating a fourth gear.

(4) Structure of the present invention Hereinafter, a detailed explanation will be given based on FIGS. 2 and 3, which are a preferred embodiment of the mechanism for preventing hand vibration of a quartz watch according to the present invention.

In FIGS. 2 and 3, reference numeral 5 denotes a drive circuit, which is composed of a crystal oscillator 6 and a frequency dividing circuit 7, and derives the intermittent pulse shown in FIG. 4A. 8
is a step motor, and 9 is a rotor of the step motor 8. 9a is a rotor pinion connected to the axis of the rotor 9. 10 is a drive coil for driving the rotor 9. One end of the drive coil 10 is connected to the drive circuit 5, and the other end is connected to the drive circuit 5 via a delay circuit 12. 1
1 is the fourth gear. The fourth gear 11 is driven by engaging with the rotor pinion 9a of the rotor 9, and a second hand (not shown) is attached to the shaft core. 12 is a delay circuit.

The delay circuit 12 is composed of, for example, resistors R, R ₁ and capacitors C, C ₁ , and transmits intermittent pulses as shown in FIG. 12, it is applied to the drive coil 10 as a delayed pulse whose rising waveform is always delayed by a minute time Δt, as shown in FIG. 4B. 13
is an electromagnet. The electromagnet 13 has an excitation coil 13b wound around an iron core 13a, and the excitation coil 13b is excited by an intermittent pulse derived from the frequency dividing circuit 7 of the drive circuit 5, that is, an intermittent pulse shown in FIG. It is connected like this.

14 is a regulation lever. The regulation lever 14
is made of, for example, an elastic thin plate spring material, and a movable iron piece 14a made of, for example, an electromagnetic mild steel plate is attached to one surface of the free end side of the electromagnet 13 facing the iron core 13a. Further, the other end side is locked by a support shaft 15 or the like, and under normal conditions, the other surface on the free end side presses the fourth gear 11 with a predetermined spring pressure applied to the regulating lever 14. The movable iron piece 14a is attached so as to be swingable so that only when the electromagnet 13 is magnetized by the applied intermittent pulses, the movable iron piece 14a is attracted and releases the pressure on the fourth gear 11.

(5) Effect of the present invention In FIGS. 2 and 3, the intermittent pulse derived by dividing the output signal from the crystal oscillator 6 of the drive circuit 5 by the frequency dividing circuit 7 is shown in FIG. Thus, it is applied to the excitation coil 13b of the electromagnet 13. At the same time, it is applied via the delay circuit 12 to the drive coil 10 of the step motor 8 as a delayed pulse as shown in FIG. Therefore, the iron core 13a of the electromagnet 13 is magnetized, attracts the movable iron piece 14a of the regulating lever 14, and releases the pressure on the fourth gear 11. Further, a delay pulse delayed by a minute time Δt from the intermittent pulse that excited the electromagnet 13 is applied to the drive coil 10 of the step motor 8 via the delay circuit 12, and the rotor 9 is rotated. That is, the rotation of the rotor 9 of the step motor 8 is controlled by the delay circuit 1.
2, the start is always delayed by the minute time Δt set by the magnetization of the electromagnet 13. Therefore, by pressing the fourth gear 11 with the regulation lever 14, the load acting on the rotor 9 is always reduced. It is designed to be driven in the state immediately after being removed. In this way, the rotational load on the rotor 9 of the step motor 8 is limited to driving a predetermined wheel train including the fourth gear 11, and the original performance of the step motor 8 can be effectively used. Furthermore, the electromagnet 13 magnetized as described above and the rotor 9 driven are pulsed approximately simultaneously after an intermittent predetermined time t ₁ based on the intermittent pulse of FIG. 4A and the delayed pulse of FIG. 4B, respectively. Since the voltage becomes zero, the electromagnet 13 does not lose its magnetic force, and therefore the regulation lever 1
4 is in its original state due to its own biased spring pressure;
In other words, the fourth gear 11 is pressed. At this time, the rotation of the rotor 9 is also stopped,
Since the fourth gear 11, which is engaged with the rotor 9, is also pressed by the regulation lever 14 when it is about to stop, it is affected by the vibrations that occur when the rotor 9 stops rotating, so that it does not vibrate. The fourth gear 11 is stopped without any influence. In this way, the second hand attached to the fourth gear 11 is reliably prevented from wobbling.

(6) Effects of the present invention (a) At the same time as the rotor of the step motor stops rotating, the regulation lever released from the electromagnet presses the fourth gear, so it is not affected by the vibrations that occur when the rotor stops rotating. The vibration of the second hand attached to the fourth gear is reliably prevented. In addition, since no rotational movement occurs when the regulating lever is pressed, there is no wear and tear due to the pressing, and a long-life anti-shake mechanism with extremely little change over time can be provided.

(b) The regulation lever that presses the fourth gear in order to prevent the second hand from wobbling attached to the fourth gear,
Immediately before the step motor starts rotating, the pressure is released by suction by the electromagnet, so it does not become a driving load for the step motor.
Therefore, it is possible to provide a mechanism for preventing hand shake of a crystal watch without degrading the performance of the step motor.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of an embodiment of a conventional quartz watch hand shake prevention mechanism. FIG. 2 is an explanatory view of a mechanism showing one embodiment of the mechanism for preventing hand vibration of a quartz watch according to the present invention. FIG. 3 is a configuration diagram showing an embodiment of the hand shake prevention mechanism of a quartz watch according to the present invention. FIG. 4A is a waveform diagram of intermittent pulses derived from the frequency dividing circuit shown in FIG. 2. FIG. 4B is a waveform diagram of a delay pulse applied to the drive coil of the step motor via the delay circuit shown in FIG. 5... Drive circuit, 6... Crystal oscillator, 7... Frequency dividing circuit, 8... Step motor, 9... Rotor, 10... Drive coil, 12... Delay circuit, 1
3...Electromagnetic force, 14...Regulation lever.

Claims (1)

[Scope of utility model registration request] A step motor driven by intermittent pulses from a drive circuit derived by frequency-dividing the output signal of a crystal oscillator is formed by a drive coil, a stator, and a rotor consisting of a permanent magnet. In a crystal clock that drives a wheel train including gears, an electromagnet is excited by intermittent pulses derived from the drive circuit, and an intermittent pulse is applied to the step motor after delaying the intermittent pulses derived from the drive circuit by a predetermined time. 1. A mechanism for preventing hand shake of a quartz watch, comprising: a delay circuit provided therein; and a regulating lever that regulates a fourth gear using the electromagnet.