JPS6138831B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a simple method that records the displacement of ground vibration as a waveform on thermal paper based on the signal output from a transducer that converts the displacement of ground vibration into an electrical signal. related to a type of earthquake recording device.

A transducer that converts the displacement waveform of ground vibration into an electrical signal is known, and many recording methods have been proposed to record ground vibration waveform data based on the signal output from this transducer. has been done. One such recording method is to record electrical signals output from a transducer on a magnetic tape as magnetic information. However, this recording method requires a large-scale apparatus, and in order to know the recorded contents of the magnetic tape, the magnetic information on the magnetic tape must be re-outputted onto a visible means, such as recording paper. To solve this problem, there is a recording method in which the electrical signal output from the transducer is directly output and recorded on recording paper. In this method, a recording pen is provided on a recording paper running at a constant speed, and a waveform is recorded on the recording paper by making the recording pen vibrate in response to an electrical signal output from a vibrator. However, with this method, when decoding the waveform recorded on the recording paper, it is necessary to take into account the time element, making this decoding extremely difficult. Furthermore, since the recording section has movable parts, handling of the apparatus is troublesome, and great care is required in managing the apparatus during operation.

An object of the present invention is to provide a simple earthquake recording device that records the earthquake occurrence time, earthquake waveform, and timing mark on thermal paper using one thermal head, making it easy to decipher the waveform. .

Another object of the present invention is to provide a simple earthquake recording device that does not require replacing recording paper, supplying recording ink, or managing time within a short period of time.

In order that the invention, its objects and advantages may be better understood, the invention will now be described with reference to the drawings.

In the earthquake recording apparatus shown in FIGS. 1 to 5, a transducer (not shown) that converts ground vibration into an electrical signal and outputs the electrical signal is connected to a connector 1 on the back (see FIG. 5). Since many such vibrators have already been proposed, a detailed explanation thereof will be omitted, but in this embodiment, a vibrator that converts ground vibration into electric current and outputs it is used. The earthquake recording device has a thermal dot printing section 2, a control section 3, a power supply section 4, and a time setting receiver 5, and can be carried by holding a handle 6 provided at the top. The front part of this earthquake recording device includes an outlet 7 for the thermal paper sent out from the thermal dot printing section 2, a switch 8 that is operated when manually feeding the thermal paper, a date and time display section 9, and this date and time display section. A changeover switch 10 for switching the display of year, month, day, and time in 9 and a date and time setting section 11 are provided. The date and time setting section 11 is usually covered with a cover 12, and inside this cover 12 there is a rotary switch 13 for specifying the year, month, day, hour, and minute, and the rotary switch 13 is used to specify the first and second digits of your finger. The configuration includes digital switches 14A and 14B for setting the time, and a push button 15 for setting the time. A tape-shaped thermal paper is wound up in a roll and loaded behind the thermal dot printing unit 2.
A cover 16 provided with a butterfly on the side of the printing section 2 so as to be openable and closable can be opened to load thermal paper.
This cover 16 is also provided with a viewing window 17.
The presence or absence of thermal paper can be determined at a glance.
The thermal dot printing section 2 includes a thermal dot head 18 in which a large number of thermal dot elements are arranged in a straight line perpendicular to the running direction, and an elastic roller 19 for pressing the thermal paper against this head.
It consists of a conveyance roller 20 for conveying thermal paper and a stepping motor 21 for driving this conveyance roller 20.

On the other hand, the rear part of the earthquake recording device is covered with a cover 22, and inside this cover 22, a start level is set, which is the current value input from the converter at which the printing section 2 is started. The rotary switch 23, the channel setting switch 24 and display section 25 of the receiver 5, and the speaker 26 for broadcasting the time signal emitted by the receiver 5.
, a connector 27 for outputting the time signal to the outside, and a digital switch 2 for setting the sensitivity of the amplifier that amplifies the current input from the converter.
8 is provided. Furthermore, the lower side of the cover 22 is covered with a cover 29, which has a power outlet 30.
In order to issue an alarm when the current value from the converter reaches a certain value, there is a rotary switch 31 that sets this alarm level, and a current value that reaches the alarm level set by this rotary switch 31. A connector 32 is provided for outputting an alarm signal to the outside when the alarm is reached. The states of the switches, date setting section, etc. are read under the control of the control section 3, and the printing section 2 records waveforms and the like on thermal paper in accordance with the input state from the converter.

FIG. 6 shows a block circuit diagram of an earthquake recording device. This earthquake recording device includes a central processing unit 35 (using a microcomputer, hereinafter referred to as CPU), a memory 36, a clock circuit 37, a timer circuit 38, and a timer circuit 38. A matching signal generator 39, a display section 40,
Thermal dot printing unit 41, A/D conversion circuit 42 that converts analog signals of ground vibration into digital signals
and a contact portion 43 are connected via a bus line 44. The memory 36 includes a ROM that stores programs, characters and constants necessary for printing date and time, and a RAM that temporarily stores data input from the exchanger and data used during time printing. The clock circuit 37 is backed up by a battery 45 so that it continues to operate even during a power outage.
The timer circuit 38 is activated at regular intervals, for example, 10 m.
Outputs interrupt signal IRQ ₁ every sec. The time adjustment signal generator 39 outputs an interrupt signal IRQ ₂ when a time signal is received from the receiver 5. The program of the CPU 35 is activated each time these interrupt signals IRQ ₁ and IRQ ₂ are output.

Next, each of the above parts will be explained in detail.

FIG. 7 shows a circuit that generates a signal indicating the address of each circuit, which will be described later. The figure shows a decoder circuit that obtains address signals from the signals of the address bus and the data bus, and 50 is a decoder that obtains address signals AD ₁ , AD _{2 .} . . from the signals of the address bus;
1 is the address signal DA ₁ from the data bus signal,
DA ₂ A decoder that obtains ......, with this decoder,
This decoder 51 has a latch function.

FIG. 8 shows the clock circuit 37 and the timer circuit 3.
8 is shown. The clock circuit 37 is the main clock circuit 52
A latch circuit 53 latches and outputs numerical data indicating the time of year, month, day, hour, minute to this main clock circuit 52, and a latch circuit 54 that latches and outputs data indicating the type of year, month, day, hour, minute, and second. , a latch circuit 55 that latches and outputs data instructing input/output, rewriting, etc. of the main clock circuit 52, and a gate circuit 56 that outputs data indicating the date and time output from the main clock circuit 52 to the data bus.
It consists of a flip-flop circuit 57 that stores a signal output from the main clock circuit 52 every second. The main clock circuit 52 includes the latch circuit 53,
Date and time output according to input signals from 54 and 55,
It is rewritten and outputs a second signal every second. The latch circuits 53, 54, 55 output the address signals DA ₁ , DA ₂ ,
Latch the data on the data bus into the latch circuit specified by _DA3 .

With this configuration, when it is desired to rewrite the date and time, the latch circuit 53 latches, for example, data indicating the first digit of the date itself, and then the latch circuit 54 latches data indicating that it is the first digit of the date. By latching the data and then latching the data for rewriting into the latch circuit 55, the main clock circuit 52 can rewrite the first place of this date to the number indicated by this data. After rewriting, the latch circuits 53, 54, and 55 are reset, and other dates and times are rewritten in the same way. Further, when it is desired to read the date and time of the main clock circuit 52, the latch circuit 54 latches data indicating, for example, the first date, and then the latch circuit 55 latches data for output, and the main clock Data indicating the first date from the circuit 52 is output. Next, decoder 5
When the address signal AD ₁ is output from 0, data indicating the first position of the date is output from the gate circuit 56 to the data bus and read into the CPU 35. During this reading, the presence or absence of the second signal is also read into the CPU 35 at the same time, and after reading, the flip-flop circuit 57 is reset by the address signal DA ₄ from the decoder 51 and is prepared for outputting the next signal.

On the other hand, the timer circuit 38 can set the timer or output the clock status of the timer as specified by the address signal _AD2 output from the decoder 50, and can also set the print timing clock regardless of this timer function. Signal CL ₁ , stepping motor drive timing clock signal
CL ₂ outputs the program start interrupt signal IRQ ₁ .

FIG. 9 shows a block circuit diagram of the time setting signal generator 39. This time setting signal generator 39 is a fixed time signal generation circuit that catches a time signal output from the receiver 5 and outputs a fixed time signal. 60, and a flip-flop circuit 61 that stores the output of the fixed time signal from this _{circuit 60} . It is then reset to prepare for the output of the next scheduled signal.

Therefore, when either of the interrupt signals IRQ ₁ or IRQ ₂ is output, the CPU 35 outputs the address signal AD ₃ from the decoder 50, determines the type of the interrupt signal IRQ ₁ or IRQ ₂ , and starts the necessary program. do.

Figure 10 shows the switch input circuit of the operating section.
Numbers 8, 10, 13, 1 attached to figures to figures 5
Numbers matching 5, 23, and 31 indicate contacts in the same portions. 62 is a digital switch circuit corresponding to the digital switches 14A and 14B, and this circuit outputs a signal indicating the setting state of the digital switch 14A for specifying the 1st place when the latch circuit 63 outputs the signal for specifying the 1st place; When the designation signal is output, a signal indicating the setting state of the 10th place designation digital switch 14B is output. When checking the open/closed state of a contact, a signal corresponding to one of the contacts is set and output in the latch circuit 63, and then the address signal _AD4 is output from the decoder 50, and the presence or absence of the signal from the gate circuit 64 is checked. You can know by making a judgment. By sequentially scanning the address signals in this way, the setting status of the switches can be checked.
Load it into the CPU 35 and set the necessary constants etc. on the CPU 35.

Figure 11 shows the thermal dot printing section 41, A/D
A circuit diagram of the conversion circuit 42 is shown. A latch circuit 65 that outputs a timing signal outputs a signal 65a when driving the thermal dot head, and outputs a signal when the signal value input from the converter is temporarily held in the A/D conversion circuit 42 and digitized. 65b, and the signal 65c when reading this digital value to the CPU.
When outputting the alarm signal to the connector 32, the signal 65d is output. 66 is a hold clutch circuit that holds driving data when driving the stepping motor 21; 67 is a hold clutch circuit that holds driving data when driving the stepping motor 21;
A stepping motor drive timing clock signal CL ₂ is inputted to this controller circuit 67 from the timer circuit 38, and the stepping motor 21 is driven in synchronization with this clock signal CL ₂ . 68
(1)...68(n) is a latch circuit that stores printing data to be output to the thermal dot head, and the data output from the latch circuit 69 is sent to the decoder 7.
The specified latch circuit is set by the address signal _LDA1 output from 0. The decoder 70 sequentially designates the latch circuits 68(1), . After that, the next latch circuit 68(2)
is specified, the print data from the latch circuit 69 is set here, and the next latch circuit 68(3) is specified. In this way, the latch circuit 68(1)...
All latch circuits 68(1)......6
8(n), set the print data. The print timing clock signal CL ₁ output from the timer circuit 38 is applied to all latch circuits 68(1)...6
8(n) after the print data is set, and all the print data is clocked by this clock signal.
Output to the thermal dot head in synchronization with CL ₁ . When this clock signal CL ₁ is being output, the clock signal CL ₂ is not output, and therefore, the stepping motor 21 is not driven during printing, and printing is performed with the thermal paper stopped.

On the other hand, the A/D conversion circuit 42 includes an amplifier circuit 74 that amplifies the signal (current) input from the converter, a filter 75 that extracts only a signal in a predetermined frequency band from the signal output from the amplifier circuit 74, and a filter A hold circuit 76 for temporarily holding the signal value output from the hold circuit 75, a digital conversion circuit 77 for converting the signal value output from the hold circuit 76 into a digital value, and a hold circuit 76 for holding the signal value at a certain point in time. a timing circuit 78 that outputs a timing signal for converting the signal value into a digital value in the digital conversion circuit 77; and a buffer 79 that temporarily sets and outputs the digital data output from the digital conversion circuit. Consisting of timing circuit 7
8 outputs a hold timing signal 78a to a hold circuit 76 in response to the output of the hold signal 65b from the latch 65, and when the hold circuit 76 stabilizes the signal value, outputs a signal conversion timing signal 78b. Buffer 79 receives signal 65c output from latch 65 and outputs digital data to the data bus.

The earthquake recording device has the above-mentioned configuration, and usually digitizes the waveform signal output from the transducer without printing it on thermal paper and stores it in RAM, and when a waveform signal larger than the set value is input, As shown in FIG. 12, the time at this point is printed and the waveform and second mark from this point are recorded on thermal paper.

Next, the operation of this device having such a configuration will be described in the thirteenth section.
This will be explained with reference to the flowchart in the figure. When the power is first turned on, the CPU executes initial processing such as setting the stack pointer, clearing RAM and ports, and then waits for the input of the interrupt signal IRQ (the first
(See Figure 3A). When the interrupt signal is input, the address signal AD ₃ is output from the decoder 50 for 10 msec.
Interrupt signal per IRQ ₁ or time signal interrupt signal
A determination of IRQ ₂ is made (see Figure 13B). 10m
If the interrupt signal IRQ ₁ is output every sec,
The program shown in the flowchart shown in FIG. 13C is executed.

This will be explained next, but to explain the case where data is recorded without printing first, the starter, printing, date printing, waveform recording, and completion mark printing flags are set at this point. do not have.
When the interrupt signal IRQ ₁ is output in this state, the presence or absence of each flag is determined after IRQ ₁ is cleared, but since the flag is not set, the latch 65 outputs the signal 65b, and the converter at this point The signal value output from the CPU is converted into a digital value and outputted to a port, and the A/D converted data of the digital value is read into the CPU from this port and stored in the RAM. At the same time, it is determined whether this digital value is the starter level set by the rotary switch 23,
If this does not reach the starter level, the address signal _AD1 is output from the decoder 50, the state of the flip-flop circuit 57 is read, and it is determined whether the seconds signal has been output. If the second signal is not output, data without the second signal is stored at the address next to the address where the A/D conversion data is stored, and if the second signal is output, the data with the second signal is stored. , resets the flip-flop circuit 57 and executes the next program. That is, it decodes the status of the switches on the operating surface and sets necessary constants or clock circuits. In this way, A/D conversion data and second signal data are alternately stored every time the interrupt signal IRQ ₁ is output every 10 msec. The memory capacity for storing this data is such that it can store the data during this period because the waveform is recorded several seconds after reaching the starter level.For example, if the waveform is to be recorded 4 seconds after reaching the starter level, then every 10 msec. requires 2 bytes, so a minimum memory capacity of 800 bytes is required.

On the other hand, if the ground vibration reaches the starter level,
It is determined that printing is in progress. At the initial point in time, since printing is not yet in progress, the starter flag is set and the program is executed to determine the presence or absence of the next second signal.
After the starter flag is set in this way, when the interrupt signal IRQ ₁ is output, since the starter flag is set, the timer 38 is set and the motor 21 is driven, and the A/D conversion data and second signal are output as described above. Continue entering data. The timer 38 is set for a sufficient period of time for the motor 21 to reach constant speed. When this timer 38 times up, the starter flag is reset and the flag indicating that the date is being printed is set.The time at this point is read from the clock circuit 37, and the data necessary to print this time, that is, the character memory, is read. Data indicating characters and numbers for the year, month, day, hour, minute, and second from the numeric memory are edited into print data necessary for printing and stored in the output RAM buffer. This printing data is edited by converting binary data into data corresponding to the dot arrangement of the thermal dot head. Thereafter, the print data in this output RAM buffer is set in the latch 68(1), outputted to the thermal dot head, and recorded in the first column on thermal paper. Then, the output RAM buffer is cleared and the completion mark printing flag is determined. Since this flag does not exist at this point, the A/D conversion data and second signal data continue to be input as described above. Since the printing flag in which the A/D conversion data reaches the starter level is also set at this point, the starter flag is not reset. The earthquake occurrence time is printed as described above. When printing of the date is completed in this manner, the date printing flag is reset and the waveform recording flag is also set.

After this, start printing the waveform and second mark. This printing data is edited into printing data using the stored A/D conversion data and second signal data each time the IRQ ₁ outputs, and is stored in the output RAM buffer. The data is edited to print between successive data values, and the second mark printing mark is ORed with the waveform printing data. This printing data is output to the thermal dot, and the waveform and second mark are printed. The waveform printed in this manner becomes a continuous waveform because successive data are continuous. During printing of this waveform, it is determined whether the input A/D conversion data is at the starter level, and when it becomes below the starter level, the waveform recording flag is reset and the completion mark is set, and the completion mark (broken line) is set. Start printing. This completion mark is not printed at the same time as the A/D conversion data becomes below the starter level, but is printed after a certain period of time after the A/D conversion data becomes below the starter level. After printing this mark, the completion mark and printing flag are displayed.
The printing flag is reset, and the stepping motor is stopped after a certain period of time after resetting the flag.

As described above, the thermal paper is conveyed only when an earthquake occurs, and the earthquake occurrence time, waveform, and second mark are printed. This makes management easy, there is no waste of thermal paper, and it is extremely easy to decipher the waveform. becomes. This is extremely effective in deciphering the epicenter of an earthquake by bringing thermal paper printed with this waveform from several locations. In order to do this, the time on all earthquake recording devices must match, but this earthquake recording device is designed to catch the time signal emitted from the radio and use this to properly adjust the time on the clock. So,
This point can be satisfied. That is, when the time signal is caught, the interrupt signal IRQ ₂ is output from the time setting signal generator 39, and the time of the clock circuit is changed to the CPU 3.
5 to set the predetermined time. Figure 13D
shows this flow diagram. It goes without saying that other programs not shown in the above flowchart are executed, such as a program for displaying the date and time on the display section 9 or for generating an alarm.

It should be noted that the above-mentioned embodiment shows one preferred example, and the present invention is not limited to the above-mentioned embodiment, but may be modified without departing from the spirit of the invention. Although the level is determined by the CPU, an independent circuit may be provided outside and printing may be started by a signal output from this circuit.

As is clear from the above explanation, according to the earthquake recording device of the present invention, the earthquake occurrence time, earthquake waveform, and timing mark can be recorded on thermal paper by one thermal dot head, and the recorded waveform can be recorded on thermal paper. It is extremely easy to decipher, does not require replacing recording paper within a short time, supplying recording ink, time management, etc., and has the advantage that the device is easy to handle.

[Brief explanation of the drawing]

The drawings show one embodiment of the earthquake recording device according to the present invention, and FIG. 1 is a front view, FIG. 2 is a side view,
Figure 3 is a plan view, Figure 4 is a rear view, Figure 5 is a rear view with the cover removed, Figure 6 is a schematic block circuit diagram, Figure 7 is a deuder circuit diagram, and Figure 8 is a clock. Circuit diagram, Figure 9 is the time adjustment generation circuit diagram, 1st
Figure 0 is the input circuit diagram of the operation unit, Figure 11 is the circuit diagram of the thermal dot printing unit and A/D converter, Figure 12 is the printed thermal paper, Figure 13 is A, B, C ₁ , C ₂ ,
D is a flowchart, and FIG. 14 is a diagram explaining the storage state of A/D conversion data and second signal data. 2: Thermal dot printing section, 5: Receiving section, 7:
Thermal paper exit, 9: Date and time display section, 11: Date and time setting section, 35: Central processing unit (CPU), 36: Memory, 37: Clock circuit, 38: Timer circuit, 3
9: Time adjustment signal generator, 41: Thermal dot printing section, 42: A/D conversion circuit.

Claims (1)

[Scope of Claims] 1. An A/D conversion circuit that converts an analog signal representing a waveform output from a converter into a digital value, and a time adjustment signal generator that catches a time signal and outputs a time adjustment signal. , a clock circuit that sets the date and time set in the date and time setting section, corrects the time based on the signal output from the time adjustment signal generator, outputs the stored date and time, and outputs a seconds signal; and a tape. a thermal dot printing section having a thermal dot head made up of a large number of thermal dot elements arranged in a straight line perpendicular to the running direction of the thermal paper; and printing letters and numbers indicating date and time on the thermal dot. a ROM for storing character and numeric data necessary for printing in copies; a RAM for storing A/D conversion data output from the A/D conversion circuit and second signal data output from the clock circuit; a memory containing at least the above A/D conversion data and the second signal data;
For characters and numbers, a certain amount of data is stored in the RAM, and when the data input from the A/D conversion circuit reaches the starter level, the date and time stored in the clock circuit at this point are read and stored in the memory. Based on the data, the thermal dot printing section prints the date and time on thermal paper, and after printing the date and time, A/D conversion data and second signal data generated from at least the starter level point are stored in the RAM. and a central processing unit configured to output a waveform and a second mark to the thermal dot printing unit so that the thermal dot printing unit prints the waveform and the second mark on thermal paper.