JPH1144780A - Mechanism for detecting position of indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detecting mechanism, which has the simple structure and of which adjustment is facilitated, by providing a projecting part in a train wheel provided with an indicator, and pushing a switch, which is arranged near the train wheel, with the projecting part so as to output the detecting signal. SOLUTION: A train wheel 1, which is journalled to a main plate 11 and a train wheel bridge 12, is turned by a motor 10, and a second hand 7 is fitted to the train wheel 1 so as to form a projecting part 2. The second hand 7 is linked with a counting circuit so as to count the position thereof. With the rotation of the train wheel 1, the projecting part 2 starts to push a switch spring 6, which is formed in a fixed part 8, at a certain time, and when the projecting part 2 crosses the switch spring 6, the projecting part 2 pushes the switch spring 6 at the maximum, and at the same time, a contact part 5 abuts on a switch 4. At this stage, detecting signal is output from the switch 4 to a circuit block 3 so as to reset the counting circuit. Structure is thereby simplified, and the number of part items can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for detecting the position of a pointer of an analog timepiece.

[0002]

2. Description of the Related Art As a conventional pointer position detecting mechanism, for example, a light emitting element and a light receiving element of an optical sensor are used as a timepiece dial,
A pointer or a glass is placed at a predetermined location, and the light emitted from the light emitting element is directly received by the light receiving element, or the light reflected by the reflector is received indirectly by the light receiving element to detect the pointer position. A device using a magnet and a magnetic sensitive device instead of the device has been proposed (for example, Japanese Patent Application Laid-Open No.
154485, JP-A-54-118870).

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 61-118683, a through hole is formed in each gear of a wheel train in a second hand drive system, and a light emitting element and a light receiving element are formed through the through hole. There is also proposed a pointer position detecting mechanism for detecting when the light emitted from the light emitting element is opposed to each through hole and received by the light receiving element, for example, as the hour.

[0004]

However, in the former pointer position detecting mechanism described above, it is necessary to provide a hole for a sensor or a reflection plate on a decorative dial or an exterior, so that the appearance appearance is deteriorated. . In addition, since the number of exterior parts of the timepiece is large, it is necessary to position the sensor for each product, which is disadvantageous in that it is troublesome and troublesome in terms of cost.

On the other hand, the latter pointer position detecting mechanism does not require complicated adjustment and does not impair the appearance, but the light emitting element and the light receiving element are opposed to each other inside the drive system of the timepiece. However, there is a disadvantage that the structure becomes complicated such as the size of the light emitting element and the light receiving element themselves and the method of electrical conduction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the cost by a simple structure and simple adjustment, to improve the commerciality without impairing the appearance, and to further improve the parts. An object of the present invention is to provide a low-cost pointer position detecting mechanism that reduces the number of points.

[0007]

The present invention has the following configuration to achieve the above object. That is,
A clock means for counting time, a motor means driven in conjunction with the clock means, a wheel train driven by the motor means, a pointer attached to the wheel train, and the pointer linked to the clock means and An electronic timepiece provided with a hand position counting means for counting the position of the hand, and a hand position detecting means for detecting a specific position of the hand and outputting a detection signal and resetting the hand position counting means based on the detection signal. , The pointer position detecting means, a convex portion provided on the wheel train to which the hands are attached, and disposed near the wheel train,
A switch member that is pressed by the convex portion and outputs the detection signal.

Further, the convex portion is provided at the tip of the gear portion of the wheel train.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1, 2, 3, 4, and 5 are embodiments of the present invention. FIGS. 1 and 2 are plan views showing a pointer position detecting mechanism. FIGS. 3 and 4 are diagrams of a pointer position detecting mechanism. FIG. 5 is a partial sectional view, and FIG. 5 is a configuration diagram of a pointer position detecting mechanism.

In FIG. 1, reference numeral 1 denotes a wheel train having a convex portion 2 and a pointer mounting portion 13;
A circuit block having an oscillation circuit, a driving circuit, a counting circuit that measures time and operates in conjunction with the driving circuit; 6 is a switch spring formed in a part of the inside of the timepiece and fixed by a fixing portion 8; Indicates a contact portion provided on the switch spring 6, and 7 indicates a second hand indicating time as a clock function. In addition, other wheel trains 9 that drive the wheel train 1 are located near the wheel train 1.
Clock components (not shown) such as the motor and the motor 10 are arranged.

The feature of the present invention is that, in FIG. 1, a pulse of, for example, 1 Hz is output from a circuit block 3 and a main plate 1 serving as a base of a timepiece is driven by a motor 10 driven in steps of 1 second.
The wheel train 1 supported by the wheel train 1 and the train wheel bridge 12 is rotating. The second hand 7 is attached to the rotating wheel train 1 and the convex portion 2
Are formed. The second hand 7 is linked to the counting circuit, and counts the position of the second hand 7. As the wheel train 1 rotates, the convex portion 2 starts to push the switch spring 6 formed on the fixed portion 8 in the direction of A in FIG. The contact portion 5 comes into contact with the switch 4 at the same time as the push operation.

As soon as the contact portion 5 comes into contact with the switch 4, a detection signal is output from the switch 4 to the circuit block 3, and the counting circuit is reset by the detection signal. At the same time, the second hand 7 is moved to the pointer attaching portion 13.
Attach to

The counting circuit immediately determines the difference between the position of the second hand 7 and the specific position, and outputs a signal to the drive circuit to output a pulse of the difference. The pulse output from the drive circuit drives the motor 10 to rotate the wheel train 1 via the wheel train 9.

In the present invention, the second hand 7 is attached to the pointer attaching portion 13 of the wheel train 1.
It may be attached to the pointer attachment portion of the wheel train 15 or the like.

FIG. 5 is a block diagram showing the configuration of the present invention.

[0016]

As described above, according to the present invention, it is not necessary to provide a hole or a reflector of an optical sensor on a decorative dial or an exterior as in the prior art. Does not degrade the appearance of the product.

Furthermore, even if the number of exterior parts of the timepiece is large, it is not necessary to position the sensor for each product, and the cost can be reduced.

Also, unlike the latter conventional example, the structure is not complicated in that a relatively large light-emitting element and a light-receiving element are disposed inside the drive system of the timepiece while electrical conduction is maintained.
With a simple structure, costs can be reduced by reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a plan view showing a pointer position detecting mechanism of the present invention.

FIG. 2 is a plan view showing a pointer position detecting mechanism of the present invention.

FIG. 3 is a partial cross-sectional view of a pointer position detecting mechanism according to the present invention.

FIG. 4 is a partial cross-sectional view of a pointer position detecting mechanism according to the present invention.

FIG. 5 is a configuration diagram of a pointer position detecting mechanism of the present invention.

[Explanation of symbols]

 1-wheel train 2 Convex part 3 Circuit block 4 Switch 6 Switch spring 7 Second hand

Claims (2)

[Claims] 1. A clock means for measuring time, a motor means driven in conjunction with the clock means, a wheel train driven by the motor means, a pointer attached to the wheel train, and A pointer position counting unit that interlocks and counts the position of the pointer; and a pointer position detection unit that detects a specific position of the pointer, outputs a detection signal, and resets the pointer position counting unit based on the detection signal. In the electronic timepiece, the pointer position detecting means includes a convex portion provided on the wheel train to which the pointer is attached, and a switch disposed near the wheel train and which is pressed by the convex portion and outputs the detection signal. A pointer position detecting mechanism comprising a member. 2. The pointer position detecting mechanism according to claim 1, wherein the convex portion is provided at a tip of a gear portion of the wheel train.