JPS6032833B2 - Parent-child clock - Google Patents

Description

[Detailed description of the invention] The present invention relates to a parent-child clock.

Conventionally, for example, the majority of time adjustments in parent-child clocks have been either manual or adjusted to the hour using a time signal.

However, the manual type has the disadvantage of requiring labor, and the one using a time signal has the disadvantage that if an error occurs due to a disturbance immediately after the hour, the correction will not be effective for a long time until the next correction is made. . In addition, in any of the above methods, when starting the clock, it is necessary to adjust the display of each child clock to the time before starting the clock, which is also troublesome.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a clock device that constantly compares the time measured by the clock device with the displayed time so that the two always match, thereby eliminating the above-mentioned drawbacks of the conventional technology. An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, there are a master clock and a ladder register that constitutes a 2, 3, and 4 memory circuit. 5 is a child clock, and 6 and 7 are minute and hour hands, respectively, which constitute hands.

Reference numerals 8 and 9 represent drive devices for the minute hand 6 and hour hand 7, respectively, which are comprised of drive coils for forward rotation and reverse rotation.

Reference numerals 10 and 11 are potentiometers that detect the indicated positions of the minute hand 6 and hour hand 7, respectively, and 12 and 13 are analog and digital conversion devices.

14 and 15 are registers, 16 and 17 are comparison devices, and 18.
...21 is an amplifier circuit.

Next, the operation will be explained. Time data is generated serially from a master clock 1, converted into parallel data by a register 2, and minute data is supplied to a register 4, and hour data is supplied to a register 3. On the other hand, the indications of the minute hand and hour hand 7 of the slave clock 5 are detected by potentiometers 10 and 11, and the output thereof is converted by converters 12 and 13 into time data which is a code output. This time data is stored in registers 14 and 15, and its output is stored in registers 3 and 15.
The outputs of 4 are compared by comparison devices 16 and 17. For example, if the minute hand 6 is advancing, that is, the register 4
When the contents of the register 15 are smaller than the contents of the register 15, an output is generated from the amplification circuit 21 by the output of the comparison dial 17, and this output drives the reversing coil of the driving bag pupil 8, and the minute hand 6 is reversed. be done. When the indicated position of the minute hand 6 is corrected, that is, when the contents of the register 15 match the contents of the register 4, the output of the comparator 17 is stopped and the minute hand 6 is stopped. When the minute hand 6 is delayed, that is, when the contents of the register 4 are larger than the contents of the register 15, an output is generated from the amplifier circuit 20 by the output of the comparator 17, and the minute hand is caused by the forward rotation coil of the drive device 8. 6 is rotated forward and corrected. That is, in normal times, this operation is performed every time the contents of the register 4 are incremented by one minute, and the minute hand is incremented. By the way, the indicated position of the hour hand 7 is detected by the potentiometer 11, and driven by the output of the comparator 16 in the same manner as described above.

Note that although a potentiometer was used as the detection device in the above embodiment, the detection device is not limited to this.

For example, a disk 21 as shown in FIG. 2 is provided behind the dial,
3 solid read switches 22 as detection elements are placed at the designated positions of 0, 2, 4... of this disk 21.
Further, an indicator hand 24 is fixed to the minute hand shaft 23.
A permanent magnet 25 constituting an operating element is fixed to the tip of the indicator needle 24. By aligning the indicated position of the indicator hand 24 with the indicated position of the minute hand 6, when the minute hand 6 indicates 0 minutes as shown in the figure, the reed switch 22 located at the 0 minute indicated position is closed. . Further, the width of the permanent magnet 25 is set so that when 1 minute is specified as shown in the third figure, the reed switches 22, 22 at the 0 minute and 2 minute positions are both closed. Indicator needle 2 like this
When the command indicates 0, 2, 4...58 minutes, the reed switch 22...22 at each indicated position
When 1, 3, and 59 minutes are indicated, the reed switches 22...22 are turned on at the indicated positions of (0, 2), (2, 4)...(58, 0) minutes, respectively. Close. Then, the output of each reed switch 22...22 is converted into a binary code and a register 1 in FIG.
Supply to 5. On the other hand, the indicated position of the hour hand 7 is also 0 as above.
, 2, 4, . . . , a reed switch may be disposed at the lq o'clock position, and a permanent magnet may be fixed to an indicator hand fixed to the hour hand shaft for detection. Note that in place of the permanent magnet and reed switch, a magnetic contact, a light emitting element, and a light receiving element may be used.

In addition, in the above embodiment, the indicated position of the minute hand and hour hand is detected, but since it is almost impossible for the hour hand to be disturbed under normal conditions, it is also possible to detect the indicated position of only the minute hand. good.

As detailed above, according to the present invention, the displayed time and the contents of the memory circuit are constantly compared, and if they do not match, the instruction is driven until they match, so the accurate time can always be obtained with a simple configuration. This allows you to immediately correct the time even if the hands shift due to disturbances, etc.

Therefore, especially when used in a parent-child clock that drives multiple child clocks, there is no need to synchronize the display time of each child clock at the time of starting the clock, and furthermore, there is no need for manpower at all after the start-up, which saves labor. It is extremely effective. In addition, to detect the indicated position of the pointer, a detection element is provided at every other indicated position, and when an operating element faces this detection element, only that detection element is operated, and an operating element is placed between the two detection elements. If the two detecting elements are activated to detect the displayed time when the device is forged, the number of detecting elements can be reduced, which is effective in downsizing.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the present invention, FIG. 2 is a front view showing a part of the detection device, and FIG. 3 is a front view in another operating state of FIG. 2. 1... Master clock, 2, 3, 4... Regis evening,
6, 7... pointer, 8, 9... drive diamond counterfeit, 10,
11... Potentiometer, 12, 13...
... Conversion device, 16, 17 ... Comparison device, 2
1...Disk, 22-22...Reed switch, 24...Indicator needle, 25...Permanent magnet. Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] 1. A master clock that generates a clock output, a memory circuit that stores the clock output from the master clock, a detection device that detects the indicated time by detecting the indicated position of the hands of the slave clock, and a detection device that detects the displayed time by detecting the indicated position of the hands of the slave clock. A conversion device that converts the output into a code output, a comparison device that compares the code output of this conversion device with the memory contents of the storage circuit and generates an output when the two do not match, and a comparison device that outputs an output when the two do not match. A parent-child clock consisting of a drive device that drives the clock.