JPS586484A - Electronic watch - Google Patents

Abstract

PURPOSE:To obtain an electronic watch which is capable of correction of both the hour and minute hands in a short time, by driving the second hand wheel with a unidirectional turn of a step motor and then driving the minute and hour hand wheels with the turn of the step motor in the other direction. CONSTITUTION:When the alternate signals are applied to a coil 2 every second, a rotor 4 turns every step to turn a second hand wheel via the next stage wheel 5, the 1st clutch wheel 6 and an idler wheel 7. In this case, a minute hand wheel 12 is prevened for its reverse by a reverse preventing spring 15, and accordingly a clutch pawl 11d of the 2nd clutch wheel 11 slides on the tooth face of a ratchet wheel 11b. Thus no rotary foace is transmitted to a pinion 11a, and as a result the wheel 12 and an hour hand wheel 16 have no turn. When 30 seconds elapses, a reverse driving signal is applied to the coil 2. Thus the rotor 4 has a reverse 4a, and the wheels 12 and 16 are turned via the wheels 5 and 11. In this case, the reverse of the wheel 8 is prevented by a reverse preventing spring 10, and the wheel 8 have no turn. Only the reverse driving signal is applied when the minute and hour hands are corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece in which a second hand wheel is driven by rotation of a step motor in one direction, and a minute hand wheel and an hour hand wheel are driven by rotation in the other direction.

In analog electronic watches with a second hand, the pointer is generally driven by the unidirectional rotation of the rotor of a step motor, and when the pointer is adjusted, an electric signal to the step motor is cut off by operating an external operating member such as a winding stem, and the second hand wheel is The hour and minute hands are adjusted using the Tsuzumi, Kotetsu, and Hinoura trains.

Some two-hand watches that do not have a second hand employ a so-called electromagnetic correction method in which the hands are corrected by applying a rotor one-step forwarding or fast-forwarding signal in response to the operation of an external operating member. Although the above electromagnetic correction method has a simple configuration, it is not used in three-hand watches with a second hand because it takes time to make corrections.

The object of the present invention is to provide a three-hand electronic watch with a second hand,
The purpose of the electronic timepiece according to the present invention is to provide an electronic timepiece that can correct the hour hand and minute hand in a short time even though it is an electromagnetic correction. a drive circuit that generates a signal to rotate the rotor in one direction and a signal to rotate the rotor in the other direction; a first wheel train group that includes a second hand wheel and is driven by the rotation of the rotor in one direction; a minute hand wheel and an hour hand wheel; A second wheel train group driven by the rotation of the rotor in the other direction, and a time adjustment circuit that generates a signal to rotate the rotor in the other direction and adjust the time of the minute and hour hands in response to the operation of an external operating member. It is characterized by having the following.

The present invention will be described in detail below with reference to the drawings.

1 to 5 show embodiments of the present invention. In FIG. 1, which is a plan view of the main part of one embodiment, 1 is a step motor;
It is composed of an electromagnetic coil 2, a stator 6, and a rotor 4. 5 is the next stage type, in which the gear 5a meshes with the rotor pinion 4a and the gear 6C of the first clutch wheel 6, and the pinion 5b meshes with the second clutch wheel 6C.
It meshes with the gear 11C of the clutch wheel 11. The first clutch wheel 6 includes a shaft 6a and a pawl wheel 6 fixed to the shaft 6a.
b, a gear 6C loosely fitted on the shaft 6a, and a clutch pawl 6d swingably mounted on the gear 6C.

The clutch spring 6e is fixed on the gear 6C and brings the clutch pawl 6d into contact with the pawl wheel 6b.

The second idler wheel is composed of a gear 7a and a pinion 7b, and the gear 7a meshes with the gear 6C of the first clutch wheel 6. 8 is the second hand wheel, A, I, drive wheel 70 kana 7b
The second hand 9 is attached to the center. Further, reverse rotation is prevented by a reverse rotation prevention spring 1o.

These next stage type 5, first clutch wheel 6, idler wheel 7, and second hand wheel 8 constitute a first wheel train group.

Next, 11 is the second clutch wheel, which has pinion 11a and pinion 11.
8, a gear 11C that is loosely fitted into the pinion 11a and meshes with the pinion 5b of the next stage mold 5;
a clutch pawl 11d swingably mounted on e;
It is fixed on the horizontal wheel 110, and the clutch pawl 11d is connected to the pawl wheel 1.
1b and a clutch spring lie brought into contact with the clutch spring 1b.

Reference numeral 12 denotes a minute hand wheel, a gear 12a meshes with a pinion Ila of the second clutch wheel 11, a pinion 12b meshes with a gear 13a of a diagonal wheel 13, and a minute hand 14 is attached to the center. Further, the minute hand wheel 12 is prevented from reversing by a reversing prevention spring 15. 16 is the hour wheel, and the kana 1 of the hinoura wheel 16
3b, and an hour hand 17 is attached to the center. These next stage type 5% second clutch wheel 11, minute hand wheel 12
, the hour hand wheel 16 and the hour hand wheel 16 constitute a second gear train group. Note that the next stage type 5 is shared with the first gear train group.

Figures 2 and 3 show other embodiments of the clutch vehicle, and the second
The figure is a front view, and FIG. 3 is a plan view.

This clutch wheel 18 includes a pinion 18a, a pawl wheel 18b fixed to the pinion 1811, a gear 18e loosely fitted to the pinion 18b, and a rotating shaft 18d11 fixed to the gear 18e.
8e, and small gears 18f and 18g that are loosely fitted onto these rotating shafts 18d and 18e and mesh with the pawl wheel 18b. When the gear 18'e rotates in one direction in FIG. Since the gear 18g is in tension with the pawl wheel 18b, the pinion 18a also rotates together, and when the gear 18C rotates in the other direction, the pinion 18a does not rotate because the pinion 18f and 118g rotate freely. At that,
When an alternating signal every second is applied to the input terminal 01.0□ of the electromagnetic coil 20 shown in FIG. 1, the rotor 4 rotates one step at a time in the direction shown by the solid line in FIG. The second hand wheel 8 rotates via the first clutch wheel 6 and the idler wheel 7, and the seconds are displayed by the second hand 9. At this time, the minute hand wheel 12 is prevented from reversing by the reversal prevention spring 15, so the second
The clutch pawl 11d of the clutch wheel 11 slides on the tooth surface of the pawl wheel 11b, and no rotational force is transmitted to the pinion 11a.
2. The hour hand wheel 16 does not rotate.

After 3Qsec has elapsed, immediately after the 1 second signal, input terminals 0, .
A reverse drive signal for driving the minute and hour hands is applied to 02 (described in detail later), and the rotor 4 is reversed by one step in the direction shown by the dotted line in FIG. The reverse rotational force of the rotor 4 at this time is transmitted to the minute hand wheel 12 via the next stage type 5 and the second clutch wheel 11, and is also transmitted to the hour hand wheel 12 via the hour wheel 16.
6, and the minutes and hours are displayed by the minute hand 14 and hour hand 17. At this time, since the second hand wheel 8 is prevented from reversing by the reverse rotation prevention spring 10, the clutch pawl 6d of the first clutch wheel 6 slides on the tooth surface of the pawl wheel 6b, and no rotational force is transmitted to the pinion 6a, and the second hand Car 8 does not rotate.

In this manner, in the above embodiment, the second hand 9 moves every 1 sec, but since the reversal signal to the electromagnetic coil 2 is applied every 3 Q sec, the minute hand 14 and the hour hand 17 move every 3 Q sec.

Next, a circuit block diagram, output waveforms of main parts, and pointer correction operations will be explained.

FIG. 4 is a circuit block diagram, in which 21 is an oscillation circuit, 22
is a frequency divider circuit. 26 is a waveform shaping circuit for creating a signal for driving the second hand, and based on the signal from an appropriate output stage of the frequency dividing circuit 22, it generates a 1 s signal as shown in FIG. 5(A).
It outputs a pulse signal for each ec. 24 is a waveform shaping circuit for forming signals for driving the hour and minute hands, and the waveform shaping circuit shown in FIG.
An hour/minute hand driving signal consisting of three continuous pulse signals as shown in B) is generated every 3 Q Sec.

Note that the hour/minute hand drive signal lags the second hand drive signal by about 3 Qrn3 phases. The hour and minute hand driving signals are three pulse signals that rotate the rotor by one step, but the driving principle in this case is well known as disclosed in Japanese Patent Laid-Open No. 80063/1983. Because it is.

The explanation will be omitted.

The outputs of these waveform shaping circuits 23 and 24 are connected to a toggle type flip-flop 27 (hereinafter referred to as T-FF) via an OR gate 251 and a selection gate 26.
It is applied to D gates 28 and 29.

Each time a signal is applied to the input terminal T, an inverted signal is output from the output terminal Q of the T-FF27 and the output terminal A.
Since the voltage is applied to the ND gates 28 and 29, signals are alternately output from the drive circuit 3o to the output end 03%o4, and current flows through the electromagnetic coil 31.

Next, the reverse rotation of the rotor 32 will be explained with reference to FIG.

When only the second hand drive signal is output from the output end 08.04, the rotor 32 rotates in one direction only, one step at a time, but every 30 se (the hour/minute hand drive signal is output from the output end 03.04). When output, the rotor 62 rotates in the other direction.

First, it is assumed that the rotor 62 is in the state shown in E of FIG. 5(E) before the second hand drive signal CI of FIG. 5(C) is applied.

When the second hand drive signal C1 is applied, the rotor 32
Rotate to the right as shown at E2 in Figure (E).

After the second hand drive signal C1 ends, the state shown in E3 of FIG. 5(E) is reached.

Next, assuming that the hour and minute hand drive signals are applied every 30 seconds, the rotor 62 rotates slightly to the right due to the first hour and minute hand drive signal, D1 signal in FIG. 5(D). (l step does not move), and immediately after that, the direction is changed to the left by the second minute signal C2 shown in Fig. 5 (C), and the direction is accelerated by the third minute signal D2 shown in Fig. 5 (D). , and rotated one step to the left. After the application of the D2 signal is completed, the phase becomes as shown by E in FIG. 5(E).

For the next 30 seconds, only the second signal is shown in Figure 5 (C)% (D
), the rotor rotates in only one direction, and the rotor rotates in one direction only until E64 in Figure 5 (E).
” ? % E Continue steps as shown in g.

Next, the correcting operation of the minute hand and 2 hour hand will be explained.

In FIG. 4, when the external operating member 66 is operated in the direction shown by the arrow 64, the switch 35 is turned on, and the Q output side of the flip-flop 36, which has been outputting a signal until now, becomes H.
The output of the inverter 37 becomes the L signal. Therefore, the selection gate 26 does not output a signal for normal hand movement.

Next, when the external operating member 36 is rotated as shown by the arrow 68, the switch 69 is turned on. At this time, the correction signal generation circuit 4o generates a signal for correcting the hour and minute hands, but the switch 69 is turned ON only once within a certain predetermined time in response to the operation of the external operation member 66. When this occurs, a signal is generated which causes the rotor 62 to reverse by one step.

When the switch 69 is turned on twice or more within a predetermined period of time, the number of fast-forward signals required to move the hour and minute hands through 30 minutes, for example, is generated.

As described above, according to the present invention, it is possible to correct the minute and hour hands in a short time even though the watch has a second hand. Further, according to the present invention, it is also possible to realize a thin alarm clock with three hands.

For example, when the external operating member 66 is pulled out in two stages, the alarm center state is set, and the external operating member 66 is rotated to rotate the minute and hour hands for time display to set the alarm at a desired time. Thereafter, when the external operating member 66 is pushed in, the minute and hour hands are returned to the time before the alarm was set by the memory circuit.

As is clear from the above explanation, according to the present invention, even in a three-hand watch with a second hand, it is possible to adjust the time in a short time even though it uses the so-called electromagnetic adjustment method, and the effect is There is something big.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention. Fig. 1 is a plan view of the main parts, Fig. 2 is a plan view of another embodiment of the clutch wheel, Fig. 3 is a plan view of the clutch car of Fig. 2, and Fig. 4 is a plan view of the clutch wheel of another embodiment.
The figure is a circuit block diagram, and FIG. 5 is a diagram showing output waveforms and rotor motion states of main parts of the circuit block diagram of FIG. 4. 1...Step motor. 4, -32...Rotor of step motor, 5.
...Next stage car, 6...First clutch car. 7...Idler car, 8...Second hand car. 11...Second clutch car, 12...
・Minute wheel. 16... Hour hand wheel, 26... Waveform shaping circuit that outputs the second signal. A waveform shaping circuit that outputs a signal for 24 minutes. 60... Drive circuit, 63... External operation member. 4o...Time adjustment signal generation circuit. Figure 1: Figure 2 Figure 3

Claims (1)

[Claims] A step motor including a rotor, a drive circuit that generates a signal to rotate the rotor of the step motor in one direction and a signal to rotate the rotor in the other direction, and a second hand wheel that is driven by the rotation of the rotor in one direction. a second wheel train group that includes a minute wheel and an hour wheel and is driven by rotation of the rotor in the other direction; and a second wheel train group that rotates the rotor in the other direction in response to operation of an external operating member. An electronic timepiece characterized in that it is provided with a time adjustment circuit that generates a correction signal for adjusting the time of the minute hand and the hour hand.