JPS5946357B2 - Operating hours meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating time meter, and particularly to an operating time meter that measures the total operating time of a plurality of machines.

A conventional operating time meter is, for example, as shown in Fig. 1, where 1 is an external contact that is linked to the device whose operating time is to be measured. shall perform an opening motion.

2 is an AC power source, which generally uses a commercial power source.

3 is a synchronous motor that rotates in synchronization with the frequency of the AC power source 2.

4 is a gear train that reduces the rotation of the synchronous motor 3 and transmits the rotation to a character wheel 5, which will be described later.

5 is a character wheel that rotates in proportion to the rotation of the synchronous motor 3. For example, numbers 0 to 9 are written around the cylinder, and when the cyclic motor 3 continues to rotate for 10 hours, the measured value becomes 1.
Constructed to increase.

Although the conventional operating time meter has a relatively simple structure as described above, it has the following drawbacks.

That is, if there are multiple devices whose operating time is to be measured, total operating time meters for these devices are required.

Then, the total operating time of the device can be measured by adding the measured values of these operating time meters to obtain a total value.

However, with this configuration, if there are a large number of devices whose total operating time is to be measured, the same number of operating time meters will be required, which is not only economically disadvantageous but also complicates the work of adding up the measured values. It had various drawbacks, such as:

The present invention has been made in view of these points, and it is an object of the present invention to provide an operating time meter that can measure the total operating time of a plurality of devices with a single device.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3 of the drawings.

FIG. 2 is a block diagram of the operating time meter according to the present invention, and in the figure, it is "ON" when operating, and 1-OFF when stopped.
It becomes J.

Reference numeral 10 denotes an external contact, which operates in the same manner as the external contact 1 shown in FIG.

A multiplexer 11 detects a load signal, that is, a signal from the external contact 10.

A reference oscillator 12 generates a reference time pulse, and is configured to generate the reference time pulse from, for example, the frequency of a commercial power source or the frequency of a crystal oscillator.

13 counts the reference time pulses of the reference oscillator 12;
This counter has an output for driving the multiplexer 11 by 1 in accordance with the counted value.

14 is an AND gate which receives the output of the multiplexer 11 and the reference time pulse as inputs.

Reference numeral 15 denotes a pulse conversion circuit, which is composed of, for example, a counter circuit.

Reference numeral 16 denotes another counter distinct from the counter 13, which counts pulses proportional to the total operating time of the equipment to be measured, and has an output corresponding to the counted value.

A display 17 is driven by the output of the counter 16, and displays the count value of the counter 16 in digital numbers.

Reference numeral 18 denotes a power supply unit, which has a function of supplying power necessary to operate the components 11 to 17 described above.

FIG. 3 is a timing chart for explaining the operation of the embodiment shown in FIG.
1 to 26 correspond to signals of portions 21 to 26 of the circuit shown in FIG. 2, respectively.

For convenience of explanation, the multiplexer 11 has an external contact 10.
Assume that only three circuits are connected.

These external contacts 10 each have a load signal or signal 21
, 22, and 23, and a relatively high level of these signals 21, 22, and 23 indicates that the external contact 10 is closed, and a low level indicates that the external contact 10 is open. .

The operation of the circuit shown in FIG. 2 will be explained below based on the timing chart shown in FIG.

When the reference oscillator 12 generates a reference time pulse 24, the counter 13 is activated at the falling edge of the reference time pulse 24 to count the reference time pulse 24.

Counter 13 outputs a signal corresponding to its counted value, and drives multiplexer 11 with this signal.

Multiplexer 11 connects external contact 10, i.e. signal 21
22.23 are selected periodically.

The thicker lines of the signals 21, 22, and 23 in FIG. 3 correspond to the portions selected by the multiplexer 11.

Therefore, the output signal 25 of the multiplexer 11 is the signal 2
1.22.23 The signal is a series of thick lines, so the third
The signal waveform becomes as shown in 25 in the figure.

The signal 25 and the reference time pulse 24 are input to the AND gate 14, and the logical product of both signals is taken, and the output becomes a signal as shown at 26 in FIG.

The pulse conversion circuit 15 receives the signal 26 as input, and one pulse of its output is converted into a pulse having a weight of one hour.

The counter 16 counts the output pulses of the pulse conversion circuit 15, and the value is displayed on the display 17.

Therefore, the display 17 allows the total operating time to be read directly.

In this invention, the reference time pulse 24 of the reference oscillator 12
If the cycle is too long, an error will occur in the measured value, but if the cycle is set to a very short value, the error can be so small that it does not pose any problem in practice.

One embodiment according to the present invention is configured as described above, but for example, the weight of one output pulse of the pulse conversion circuit 15 is 1.
If configured to represent minutes, it is possible to measure the total operating time in minutes.

Further, a display device, such as a light emitting diode or a lamp, for displaying the status of the external contacts 10 can be provided on the input side of the multiplexer 11, so that the operating status of the external devices can be displayed all at once.

Furthermore, by including a display device such as a light emitting diode or a lamp that flashes in response to the level of the reference time pulse, it is configured to be able to display that the operating time meter according to the present invention, especially the reference oscillator, is operating. You can also.

Further, although the power supply section 18 was not described in detail, it may be inputted with a commercial power source, or may use a storage battery.
Alternatively, the configuration may be such that both can be used together.

Also, although the explanation was omitted in the above embodiment, the counter 1
Various modifications can be made taking advantage of the spirit of the present invention, such as by providing 6 reset switches or by adding a reset circuit that generates a reset signal every fixed period of time, for example, every hour or every 24 hours.

Further, although the operating time meter according to the present invention is configured to be able to measure the total operating time of a plurality of devices, there is no problem in using it to measure the operating time of a single device.

As is clear from the above description, according to the operating hour meter according to the present invention, the reference time pulse and the load signal detected corresponding to the count value of this pulse are subjected to logical processing, and one pulse is outputted from the predetermined output. By converting the pulses so that they have time weights and counting and displaying these converted pulses as total operating time, it is possible to measure the total operating time of multiple pieces of equipment with one device. There is no need to provide multiple meters at all, and no installation space is required, making it extremely economical.

It is also extremely useful, as it eliminates the need for the complicated task of calculating the total operating time by adding up the measured values of a plurality of operating time meters.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional operating time meter, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a timing chart showing the operation of an embodiment of the present invention. be. In the figure, 10 is an external contact, 11 is a multiplexer, 12 is a reference oscillator, 13 is a counter, 14 is an AND gate, 1
5 is a pulse conversion circuit, 16 is a counter, 17 is a display device,
18 is a power supply section.

Claims (1)

[Claims] 1. A plurality of external contacts that are linked to each device whose operating time is to be measured and are taken out as respective load signals, a reference oscillator that generates a reference time pulse, and a reference time pulse that is counted and the counted value is calculated. a first counter that generates a signal corresponding to the first counter; a multiplexer that sequentially and periodically selects and detects each load signal driven by the output signal of the first counter and passed through the external contact; and the detected load. a gate circuit that performs logical processing on the signal and the reference time pulse; a pulse conversion circuit that converts one pulse output from the gate circuit into a pulse having a predetermined time weight; and a pulse conversion circuit that counts the converted pulses. 1. An operating time meter comprising a second counter and a display that displays the total operating time based on the output signal of the second counter.