JPS5852170B2 - Pen difference correction device for multi-pen recorder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pen difference correction device for a multi-pen recorder.

Recorders are already known in which a plurality of pens are prepared to record a plurality of simultaneously applied input signals on a single sheet of recording paper, and each of the pens is driven in accordance with each of the input signals.

This type of recorder requires each pen to be moved in the width direction of the recording paper according to the input signal, so each pen is positioned along the time axis of the recording paper, that is, in the direction in which the recording paper is transported. It is staggered and placed.

This difference in the position of the pens is called a pen difference, and if each pen has a pen difference like this, when each input signal is given at the same time at the same time, each pen is driven based on that input signal. If so, it is not possible to record on recording paper with the time axis origin at the same point.

In order to avoid this and record each input signal given at the same time on the recording paper with the same time axis origin, the pen should be driven and recorded when the recording paper is moved by the pen difference. It has been known.

However, in order to do this, the input signal must be stored in the storage device, and when the time corresponding to the pen difference has elapsed,
It would be possible to extract this, but when the input signal is given as an analog quantity, it is extremely troublesome to store it in a storage device and extract it with a predetermined time delay.

In this respect, since it is easy to record and delay digital quantities, a method can be considered that first converts an analog input signal into a digital quantity, records and delays it, takes it out, and then converts it back to an analog quantity. .

However, when using such a method, a storage function and a delay function must be provided individually and independently for each input signal system.

Furthermore, each input signal must be electrically isolated from each other, so it is necessary to insulate the front and back of the memory function and delay function system for each input signal system using an isolation amplifier, etc. The configuration becomes extremely complicated.

An object of the present invention is to simplify the configuration by sharing the digital conversion, storage function, and delay function of an input signal for pen difference correction, and to simplify the electrical isolation of these functions.

Embodiments of the present invention will be described below with reference to the drawings.

1A to 1N are input terminals to which input signals are applied, 2A to 2
N is a servo mechanism. 3A to 3N are pens, which are driven by each servo mechanism 2A to 2N.

4 is the recording paper, 5 is the motor for feeding the recording paper, 6 is the motor 5
This is the drive circuit.

These configurations are not much different from the conventional configuration as a multi-pen coder, and each pen is arranged at a different position along the time axis direction of the recording paper 4, that is, the transport direction (for example, the direction of arrow P). It is driven in the width direction of the recording paper 4 (direction perpendicular to the time axis direction) in accordance with the signal, and records the input signal as time changes.

In this example, the position of the first pen 3A is taken as the reference position, and although this is recorded directly on the recording paper 4 based on the input signal given to one first input terminal, each subsequent pen is It is assumed that after recording with one pen 3A, the recording paper 4 is driven to record on the recording paper 4 in response to an input signal applied to each corresponding input terminal with a time delay corresponding to the pen difference.

The time axis origin of the recording on the recording paper by each pen after the second pen 3B is made to coincide with that of the recording by the first pen 3A.

To further comment on this, if the recording pen 3A performs a recording operation at the time of compositing, then the recording paper 4 has moved by the pen difference between the pens 3A and 3B (the time required for this movement is It is determined by the difference and the transport speed of the recording paper 4.

) If the pen 3B performs a recording operation, the recording by the pen 3B is performed at the same time axis origin as the recording by the pen 3A.

Similarly, if pen 3A performs a recording operation when pen 3A moves by the pen difference between pens 3A and 3C, this will be at the same time axis origin as the recording of pens 3A and 3B. It is recorded.

Here, the pen difference between pen 3A and each pen after pen 3B is assumed to be Xl-X2...Xn-1.

Each input terminal after input terminal 1B has an analog bow calculator 11.
．． Zero comparator 12, shift register 13, DA converter 14
and a sample hold circuit 15 are respectively prepared.

Analog subtractor 11. Zero comparator 12, shift register 1
3 and the DA converter 14 are for digitizing input signals together with a microprocessor to be described later.
Of these, the shift register 13 and DA converter 14 are also used as an input signal circuit to a servo mechanism that cooperates with a sample and hold circuit 15 to determine the amount of pen drive.

In the case of converting the input signal into a digital signal, the DA converter 14 converts the digital value of the shift register 13 into which the value given from the microprocessor (to be described later) is registered, and supplies this to the subtracter 11, which converts the digital value from the analog input signal. Subtract.

When the input signal is greater than the analog value from the DA converter 14, the output from this produces a logic output "1" from the zero comparator 12.

Numerals 16 to 19 are (N-1) insulating photocouplers, and 20 is a micro 2° losser.

The insulating photocoupler 16 provides a logic output "1" from each zero comparator 12 as a "0" to the microprocessor 20.

In response to this, the microprocessor 20 sends data to each shift register 13 from the insulating photocoupler 17.

This data is shifted in response to a shift control pulse sent from the microprocessor 20 via the insulating photocoupler 18.

When driving the pen (that is, after digitizing the given input signal, and after a time delay depending on the pen difference)
, the digital values of the input signals are successively outputted from the memory described later, and these are transferred from the insulating photocoupler 17 to the shift register 1.
3, it is registered by a shift control pulse from the insulating photocoupler 18.

This register value is converted into an analog quantity by the DA converter 14.

At this time, a sample signal is output from the microprocessor 20 via the insulating photocoupler 19, and the analog value converted by the DA converter 14 is sampled and held by the sample hold circuit 15.

Each pen is driven via a servo mechanism according to this sample hold value.

Reference numeral 21 denotes a storage device that stores digital values obtained when the input signal is digitized by the microprocessor 20.

The storage device stores the digital values stored here for a time corresponding to each pen difference, and when that time has elapsed, the digital values are taken out and registered in the shift register 13 via the microprocessor 20 and the insulating photocoupler 17.

The storage device 21 is constituted by, for example, shift registers 22A to 22M that store one word at a time, and the stored one word of data is sequentially shifted at regular time intervals.

Then, it is shifted a number of times according to the pen difference and then taken out.

23 is a memory data bus, and 24 is a memory address bus.

25 is a pen difference setting device in which a value corresponding to each pen difference is set.

This setting value is given to the storage device 21 via the microprocessor 20 and determines the memory time of each memory.

At the same time, the transport speed of the recording paper is determined, and a corresponding signal is given to the drive circuit 6 via the bus 26 to control it.

This is because it is necessary to determine the storage time of each memory and the moving speed of the recording paper according to the pen difference.

In the above configuration, N input signals are sequentially applied to input terminals 1A to 1N, respectively.

An input signal given to one input terminal is given as is to two servo mechanisms, which drives the pen 3A and records it on the recording paper 4, but other input signals are converted into digits and sent to each memo. ' Stored in J22A to J22M.

Then, after a time delay determined by each memory 22A to 22M, it is taken out from here, converted to analog again, and then given to the servo mechanisms 2B to 2N, which drives each pen 3B-:jN and writes it on the recording paper 4. It will be recorded.

Recording by each of the pens 3B to 3N is performed according to the same time axis origin as the time axis origin when recording by the pen 3A.

In other words, even if there is a pen difference, all input signals are recorded with the same time axis origin.

To explain the above operation in more detail, when digitizing an input signal, predetermined data is registered from the microprocessor 20 into the shift register 13.

For example, if 12-bit data is registered in the shift register 13, data in which the 12th bit, which is the largest digit, is set to logic "1" and the other bits are set to logic rOJ is first registered.

This digit value is converted into an analog signal by a DA converter 14 and provided to an analog subtracter 11 .

The analog value obtained by the DA converter 14 is subtracted from the input signal, and if the result is positive, the zero comparator 5 outputs a logic "1".

This enters the microprocessor 20, and from the microprocessor 20, it then goes to the shift register 13, setting the 12th bit to logic "1".

If the result of subtraction by the analog subtracter 11 is negative,
A logic "0" is output from the zero comparator 5.

Then, as described above, the 12th bit of the shift register 13 is set to logic "0" via the microprocessor 20.

Then, the 11th bit is set to logic "1". At this time, the 12th bit is the logic "1" determined as described above.
Or "0" is registered, and the 10th and subsequent bits are set to logic "0".

This digital value is analogized by the DA converter 14 and given to the analog subtracter 11 as before.

Then, the logic of the 11th bit is determined to be "1" or "0" by the output of the zero comparator 12.

When each bit is sequentially compared in this way and all 12 bits are compared, the shift register 13
The register value becomes the digital value of the input signal at that time.

When each of the 12 bits has been successively compared in this way, the same register value as the register value of the shift register 13 is stored in the corresponding memory of the storage device 21 by the memory address bus 24.

Note that the time required to digitize an input signal once is on the order of microseconds, which is a time that can be ignored with respect to changes in the input signal.

After one digitization of the input signal is completed, the data that was previously stored in the memory and has been stored for the time determined by that memory is subsequently retrieved by the memory address bus and sent to the microprocessor 20. After that, it is registered in the shift register 13.

This is then converted into an analog value by the DA converter 14.

At this point, a sample signal is output from the microprocessor 20 via the insulating photocoupler 19.

As a result, the sample and hold circuit 15 samples and holds the analog value from the DA converter 14 at that time instead of the previously held value.

As described above, the corresponding pen is driven by this sample hold value.

During this time, the output from the zero comparator 12 is sent to the microprocessor 2.
0 is not accepted.

Then, after the sample and hold circuit 15 newly samples and holds, the microprocessor 20 receives the output from the zero comparator 12, and the output from the zero comparator 12 is sent to the shift register 13 again.
The th bit is set to logic “1” and the other bits are set to logic “0”.
”.

Repeat this below.

The value newly sampled and held by the sample hold circuit 15 is an input signal with a time delay according to the pen difference, so the recorded value recorded by driving the pen according to this sample held value is the recorded value by the pen 3A. will be recorded with the same time axis origin.

As can be understood from the above explanation, if we were to explain the correction of the pen difference here in other words, it would mean that the time axis on the recording paper recorded by pen 3A is even below that of another pen. When the pen is moved by the movement of 4, the input given to one input terminal of the rabbit causes the pen to be driven 1 by another input signal input at the same time as the pen.

In the above configuration, the signals of each system and the microprocessor 20 are electrically isolated using an insulating photocoupler.

This ensures that each input signal is electrically isolated.

This can easily eliminate the trouble of arranging isolation amplifiers before and after AD conversion and DA pre-conversion for each system, as in the case of using isolation amplifiers.

As described in detail above, according to the present invention, it is possible to correct the pen difference by A.
When using D conversion and DA pre-conversion, there is no need to provide memory and delay functions for each system, which simplifies the configuration, and by using an insulating photocoupler, electricity between each input signal can be reduced. This advantageous effect, in combination with the use of a microprocessor, is that the standard isolation structure can be extremely simplified.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the present invention. 1A~1N...Input terminal, 2A~2N...
・・・Servo mechanism, 3A~3N・・・Pen
4... Recording paper, 11... Analog subtracter, 12... Zero comparator, 13... Register (shift register), 14... ...DA converter, 15...Sample hold circuit, 16-19
...Insulating photocoupler, 20...Microprocessor, 21...Storage device, 22A~
22M...Shift register.

Claims (1)

[Claims] 1. A plurality of pens are arranged at shifted positions along the recording paper transport direction and record on the recording paper based on each input signal, and an input signal is given to each system of the input signal. an analog subtracter, a zero comparator that outputs a logic "1" or "0" depending on the result of subtraction by the analog subtracter, a register, and a register that converts the data registered in the register into an analog quantity and converts it into an analog quantity. a DA converter that supplies an analog quantity to the analog subtracter as a subtraction value;
A sample hold circuit that samples and holds the output of the DA converter when a sample signal is applied, and a servo mechanism that drives a corresponding pen based on the analog amount held by the sample hold circuit, further comprising: When the logic output from the zero comparator is given through the insulating photocoupler, data is input to the register until the register value of the register matches the digit value obtained by converting the input signal into a digit according to the logic output. A microprocessor is provided which stores the digital value through an insulating photocoupler and stores the digital value when the values match in a storage device for a time corresponding to the pen difference between the respective pens. After storing the data, the data that has already been stored for a time corresponding to the pen difference is registered in the register via the insulating photocoupler, and a sample signal is sent to the sample hold circuit via the insulating photocoupler. A pen difference correction device for a multi-pen recorder.