JPS6133530Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a recording device that does not have a drive mechanism for moving a recording element such as a pen, which is used in, for example, an automatic balancing recorder using a servo.

If the recorder is realized using, for example, a parallel thermal head made up of a plurality of heating dot elements d1, d2, . . . dn arranged in parallel as shown in FIG. In addition, frames 3 and 4 can also be recorded, making it possible to obtain a recorder with higher accuracy in relation to the frames than in the conventional case where frames are recorded in advance on recording paper.

However, there is no problem because the heating dot element involved in recording trajectory 2 of the measured quantity always changes and moves, but the heating dot element involved in recording frames 3 and 4 remains constant and does not change (for example, dot d6). and dot dn-3) Therefore, when the recorder is in operation, that heat-generating dot element is always used for frame printing, and it is used extremely frequently compared to other heat-generating dot elements, which ultimately shortens the life of the recorder as a whole. There is a problem that the lifespan of the heating dot element for frame recording is limited and the lifespan is extremely short.

In view of the above points, the purpose of this invention is to provide a heat-sensitive recording device that prevents the heat-generating dot elements involved in frame printing from fixing and has a high precision and a long life.

In order to achieve the above object, the thermal recording device of this invention is equipped with a means for changing the frame position signal supplied to the thermal head, and changes the frame position signal for each measurement to reduce the heating dots involved in frame printing. The relative relationship between the frame and the measured quantity is kept unchanged by averaging the frequency of use of the elements and by providing a means for changing the measured quantity position signal by the change in the frame position signal.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 2 is a circuit block diagram of a thermal recording device showing an embodiment of this invention.

In FIG. 2, the A/D converter 5 receives at its input the analog signal under test applied to the terminal 6, derives an M-bit digital signal corresponding to the analog quantity, and applies it to one end of the input of the adder 7. The nonvolatile counter 8 is a counter that counts 1 every time the power is turned on, and its output N-bit digital signal is connected to be added to one end of the input of the decoder 9, and is also connected to the adder 7. Connected to be applied to the other end of the input.

The adder 7 adds the measured quantity digital signal supplied from the A/D converter 5 and the digital signal from the nonvolatile counter 8, and supplies the summed output (about M+1 bits) to the decoder 9. Decoder 9
receives an N-bit digital signal from the nonvolatile counter 8, and supplies a position signal for frame printing to the thermal head 10 in accordance with the content of the signal. On the other hand, the decoder 9 also receives the digital signal from the adder 7, converts it into a position signal according to the digital value, and supplies it to the thermal head 10. Therefore, the output of the decoder 9 has two systems, a frame position signal system and a measured object position signal system, and the outputs of these two systems are added to the thermal head 10 in a logical sum manner, and are contained in the thermal head 10. Current is passed to each corresponding heating dot element via a driver with a current amplification function.

Strobe oscillator 11 supplies a synchronizing signal to thermal head 10. The thermal head 10 executes a printing operation every time it receives a synchronization signal from the strobe oscillator 11, and records frames 3 and 4 and the measured quantity locus 2 as a series of dots on the thermal recording paper 1 shown in FIG.

Now, suppose the count value of non-volatile counter 8 is from 1.
Assuming that it is possible to count up to 10, the content of the nonvolatile counter 8 becomes 1 when the power is first turned on, and this value 1 is converted into a frame position signal by the decoder 9.
Current flows through the heating dot element d1 of the thermal head 10 to perform frame printing. Since the contents of the non-volatile counter 8 do not change while the power continues to be turned on, the frame printing continues as it is on the heating dot element d1.
Proceed at the position. During this time, non-volatile counter 8
Since the contents of A- are also supplied to the adder 7,
The output of the D converter 5, that is, the digital quantity to be measured,
The +1 digital value is always derived from the output of the adder 7 and applied to the decoder 9. The signal added to the measured quantity by 1 is also converted into a position signal by the decoder 9, and current is applied to the corresponding heating dot element of the thermal printer to perform printing. Naturally, this printed quantity to be measured changes from moment to moment.

Even when the current measurement is completed and the power is turned off, the nonvolatile counter 8 is not cleared and stores 1. Therefore, when the power is turned on next time for measurement, an additional count of +1 is made, and the memory content of the nonvolatile counter becomes 2, and correspondingly, the heating dot element for printing the frame moves from d1 to d2. The value added to the measured quantity by the adder 7 becomes 2. As a result, compared to the first measurement, the current measurement is printed and recorded in such a manner that both the frame and the measured quantity are shifted one dot to the right as a whole.
Furthermore, when the power is turned on for the next measurement after the power is turned off, the nonvolatile counter 8 counts +1 again, so its content becomes 3, and correspondingly, the heating dot element for frame printing moves from d2 to d3. Then, the numerical value added to the measured quantity by the adder 7 becomes 3. As a result, compared to the previous measurement, the current measurement was
Both the frame and the quantity to be measured are printed and recorded in a form shifted entirely to the right by one dot. In this way, each time the power is turned on, the contents of the nonvolatile counter 8 are incremented by +1, and the increment continues up to 10, so that the frame is shifted to the heating dot element d10. When the power is turned on again, the contents of counter 8 are cleared to 10, so when the power is turned on again, the contents become 1, and from then on, the same operation as above is repeated every time the measurement is finished and the power is turned on again. . Then, the frame repeats the movement between the heating dot elements d1 to d10.

In the above embodiment, the signal conversion by the decoder 9 may be processed by a program using a microcomputer.

Further, in the above embodiment, the case where only the baseline frame is moved has been described, but it goes without saying that the frame corresponding to the full scale can also be moved.

Furthermore, in the above embodiment, the non-volatile counter is incremented by one step each time the power is turned on, but the non-volatile counter may be incremented by one step at regular intervals, for example, every day.

Furthermore, although a non-volatile counter is used in the above embodiment, the designation of the heating dot element for frame printing, that is, the frame position signal, may be manually set from outside.

Furthermore, although a heating resistor element is used as the recording dot element in the above embodiment, the present invention is not limited to this, and other recording dot elements may be used.

As described above, according to the recording device of this invention, since a recording head consisting of a plurality of recording dot elements arranged in parallel is used, the measured quantity and the frame can be printed without using a mechanical drive mechanism. Because it can be done, a high-speed recorder can be realized. Moreover, since it is equipped with a means for changing the frame position signal, and the recording dot element for frame printing can be changed for each measurement, the recording dot element is used evenly, resulting in a long-life recorder as a whole. can be obtained.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the outline of printing a measured quantity locus with a frame on recording paper using a parallel thermal head, and Figure 2 is a diagram of a thermal recording device showing an embodiment of this invention. FIG. 3 is a circuit block diagram. 1...Recording paper, 5...A-D converter, 7...Adder, 8...Nonvolatile counter, 9...Decoder, 10...Thermal head, 11...Strobe oscillator, d1, d2, ~ dn...Heating dot element.

Claims (1)

[Claims for Utility Model Registration] (1) An A-D converter that receives a measured quantity signal and converts it into a digital signal, and a conversion means that receives a digital signal from the A-D converter and converts it into a position signal. and a recording head which includes a plurality of recording dot elements arranged in parallel and which receives the measurement target position signal from the conversion means and records its locus, and which also receives and records the frame position signal. means for changing the frame position signal;
1. A recording apparatus characterized by comprising means for changing the measured quantity signal from the converting means by the change in the frame position signal in response to a change in the frame position signal. (2) The frame position signal changing means is composed of a non-volatile counter that counts each time the power is turned on, and further includes means for receiving and adding the output of the A-D converter and the output of the non-volatile counter as inputs,
The utility model is characterized in that the converting means supplies a frame signal to the recording head based on the output of the nonvolatile counter, and receives the output of the adding means and supplies a measured quantity position signal to the recording head. A recording device according to claim 1.