JPS6111667Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a crystal clock, more specifically, a clock-type crystal clock with a vertical dial, such as a table clock or a wall clock, and its main purpose is to The object of the present invention is to provide a crystal clock that can reduce loss of torque for driving a clock gear and reduce power consumption for driving a clock gear.

For clock-type crystal watches that are generally used with the dial set vertically, the clock hands such as the clock, minute hand, and second hand should be moved from the 12:00, 0:00, and 0:00 positions, respectively.
Compared to rotating the hour, 30 minute, and 30 second positions, the torque required to rotate the remaining half-circle is larger, and this effect is particularly large when rotating the minute hand. If the torque of the motor that drives the clock hands is reduced at a constant rate, a problem arises in that the clock hands no longer rotate upward due to a slight load applied to the wheel train.

The present invention was devised in view of the above points, and is based on an example in which the power consumed when driving the minute hand is varied between when the minute hand rotates downward and when it rotates upward. Describe. FIG. 1 shows a clock mechanism, in which a second hand gear 2, a minute hand gear 3, and a clock gear 4 are arranged coaxially on a main plate 1, and two large and small ones with different diameters are formed on the back side of the minute hand gear 3. With conductive bands 5a, 5b shaped like two semicircular arcs and three contact terminals 6a, 6b, 6c fixed to the main plate 1,
A switch S is configured to change the magnitude of the output from the crystal clock circuit C for controlling the clock gear drive motor M into two levels. Conductive bands 5a, 5
As shown in FIG. 2, each conductive band 5a, 5b is embedded in the outer periphery of the back surface of the minute hand gear 3 so as to occupy a range of 180 degrees around the circumference, and each conductive band 5a, 5b is flush with the back surface of the remaining minute hand gear 3. The inner periphery occupying half of the width direction of the large diameter conductive band 5a is continuous with the outer periphery part occupying the width direction of the small diameter conductive band 5b at both ends in the circumferential direction. A common conductive band 5c forming one common ring is formed. On the other hand, three contact terminals 6a, 6b, which communicate with the crystal clock circuit C,
6c are fixed to the main plate 1 in a lined up along the radial direction of the minute hand gear 3, and two of the three are in contact with one of the conductive bands 5a and 5b,
The remaining one is the minute hand gear 3 other than the conductive bands 5a and 5b.
Two of the three contact terminals 6a, 6b, and 6c that contact the back side of the conductive bands 5a and 5b at the same time are short-circuited, and the changeover switch 5 is switched to one side, and the output of the motor M is set to either large or small. It is something that can be switched. That is, three contact terminals 6a, 6b,
Among the contact terminals 6c, the central contact terminal 6a is in contact with the common conductive band 5c, and is always in contact with either conductive band 5a, 5b during the rotation of the minute hand gear 3, and the first contact terminal 6b located on the outside is in contact with the common conductive band 5c. The inner second contact terminal 6c is arranged on a ring that passes between the outer circumference of the large-diameter conductive band 5a and the back surface of the minute hand gear 3 on the outside of the small-diameter conductive band 5b, and the inner second contact terminal 6c connects with the back surface of the minute hand gear 3 on the outside of the large-diameter conductive band 5a. The common contact terminal 6a and one of the first and second contact terminals 6b are disposed on a ring that passes through the inner circumferential surface of the small-diameter conductive band 5b, and while the minute hand gear 3 rotates 1/2, the common contact terminal 6a and either the first or second contact terminal 6b are connected. During the remaining 1/2 rotation, the common contact terminal 6a and the other contact terminal 6c are short-circuited, and while the minute hand gear 3 is rotating, each contact terminal 6a, 6b, 6c is connected to the large-diameter conductive band 5a. The changeover switch 5 is switched when passing the boundary with the small-diameter conductive band 5b, and one boundary between the conductive bands 5a and 5b corresponds to the position where the minute hand 10 indicates 0 minutes. . Therefore, the minute hand 10
During 1/2 rotation from the position indicating 0 minutes to 30 minutes,
Changeover switch 5 between 30 minutes and 0 minutes 1/2 rotation
can be switched, and 1/2 from 0 to 30 minutes
During rotation, the output I for driving the motor M output from the crystal clock circuit C is 1/2 for 30 to 60 minutes.
By setting the output D to be smaller than the output D during two rotations, the drive current of the motor M can be reduced when the minute hand 10 rotates downward, which requires a small torque.
Power consumption can be saved, and when the motor M is driven by dry batteries, the lifespan of each dry battery can be extended. In the figure, 11 is a transmission gear, 12 is a minute wheel, 13 is a second hand, and 14 is an hour hand.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing the timepiece mechanism of an embodiment of the present invention, Fig. 2 is a plan view showing the minute hand gear of the same, Fig. 3 is a schematic circuit diagram of the same, and Fig. 4a, b.
The figure is a waveform diagram showing two large and small output currents output from the same crystal clock circuit, 3 is the minute hand gear,
5a and 5b are conductive bands, 5c is a common conductive band, 6a is a common contact terminal, 6b is a first contact terminal, and 6c is a second contact terminal.
Contact terminals, S is a changeover switch, M is a motor, and C is a crystal clock circuit.

Claims (1)

[Scope of utility model claims] On the outer periphery of one side of a clock gear with a clock hand attached to an output shaft protruding from the center, two semicircular arc-shaped conductive bands with different diameters occupying a range of 180 degrees from each other are formed. The inner periphery of the large-diameter conductive band and the outer periphery of the small-diameter conductive band are continuous at both ends in the circumferential direction to form a common conductive band forming one continuous ring, and the clock is output from the crystal clock circuit. Three contact terminals, each fixed at a fixed position, constituting a changeover switch that switches the magnitude of the output for controlling the gear drive motor into two stages, large and small, contact one side of the clock gear including the conductive band, Of the three contact terminals, the common terminal is in sliding contact with the common conductive band, and of the remaining two contact terminals, the first contact terminal located on the outside in the radial direction of the clock gear is in contact with the common conductive band. They are arranged in one ring that passes through the outer circumference of the large-diameter conductive band and the clock gear face on the outside of the small-diameter conductive band. A crystal placed in a ring that passes through the gear surface and the inner circumference of a small-diameter conductive band, and set so that the joining point of the two conductive bands coincides with the point where the clock hand indicates 12 o'clock on the dial. clock.