JP2936802B2 - Pen recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen recorder, and more particularly, to an improvement in a pen recorder for recording the maximum value and the minimum value of measurement data within a recording paper feed cycle with a line segment.

[0002]

2. Description of the Related Art As a prior application of a pen recorder for recording the maximum value and the minimum value of measurement data within a recording paper feed cycle with a line segment, Japanese Patent Application No. 60-117781 (Japanese Patent Publication No. 2-50405) ) Filed. This prior application solved the problem of a conventional multi-pen recorder that was configured to convert the magnitude of an analog input signal applied to each recording pen system into a digital signal with a period related to the recording paper feed speed. Things.

That is, when the magnitude of an analog input signal applied to each recording pen system is converted into a digital signal at a period related to the feed speed of the recording paper, the sampling period of the analog input signal becomes, for example, Resolution
If the feed speed is 0.125 mm, for example, when the feed speed is as low as 2 cm / h, it becomes as long as 45 sec.
When the speed is as fast as cm / min, it is as short as 25 ms. As a result, since the measurement cycle changes according to the feed speed of the recording paper, measurement at a constant cycle cannot be performed. Especially when the feed speed is set to be low, the monitoring performance is deteriorated. Therefore, the prior application is configured as shown in FIG. 6 so as to prevent the monitoring performance from deteriorating even when the recording paper feed speed is set low.

[0004] In FIG. 6, is 1 ₁ to 1 ₃ are recorded pen, recording pens 1 so as to maintain a predetermined distance from the reference recording pen 1 ₁ in the feed direction of the recording paper 2 as indicated by arrow A ₂ and _{1 3} are arranged. Reference numeral 3 denotes a platen, which is rotationally driven via a recording paper feed mechanism 4 in accordance with a feed speed set by an arithmetic control unit 5. In addition, as the recording paper feeding mechanism 4, one configured by a pulse motor is used. ₆₁ through 65 ₃ is an input terminal to which the analog input signal is applied, to the analog-to-digital converter 8 _{1-8 3} after these analog input signal is amplified to a predetermined size at each preamplifier 7 _{1-7 3} It is added and converted to a digital signal. Here, these analog-to-digital converter 8 _{1-8 3} performs signal conversion at a constant period independent of the cycle of the feeding speed of the recording paper 2 in accordance with the control signal applied via the photocoupler 9 ₄ from the arithmetic control unit 5 It is added to the calculation control unit 5 through a photocoupler 91 _to 93 ₃ the converted digital signal as measurement data.

Thus, the number of data conversions increases as the feed speed of the recording paper 2 decreases, and decreases as the feed speed increases. The reference recording pen 1 ₁ strains of measurement data sequentially servo system through the operation control unit 5 11
Added to _1, it is recorded in real time by the recording pen 1 _1. In contrast, the reference recording pen 1 ₁ each recording pen 1 ₂ other than _one measurement data of the _three lineages maximum during one period of the recording paper feed is added to the arithmetic and control unit 5 (one step), the minimum value and the average value is calculated, their values memory 10 ₂ are respectively provided on each recording pen systems,
It is stored in the 10 _3.

That is, the arithmetic control unit 5 calculates the maximum value, minimum value and average value each time one measurement is completed, and stores the maximum value, minimum value and average value stored in the internal memory up to the previous time. Updates the value and stores the latest maximum, minimum, and average values stored in this internal memory in memory 1.
Output to 0 _2, 10 _3. Memory 10 _2, 10 in this way
The value stored in ₃ provides a predetermined delay time to compensate the phase difference between the reference recording pen 1 ₁ in accordance with a control signal applied from the arithmetic control unit 5 in accordance with the set value of the feed speed of the recording paper 2 read out to the respective servo system 11 _2, 11 ₃ selectively in order to one or more is previously set at the timing will be recorded by the recording pen 1 _2, 1 _3.

FIG. 7 shows a memory 102, ₂ used in the apparatus shown in FIG.
10 is an explanatory view of the principle of _3. That is, when there is a phase difference between pens corresponding to n steps along the feed direction of the recording paper 2, a ring buffer capable of storing n data is used as shown in FIG. And move the output pointer OP. The movement of the pointers IP and OP is performed by interruption every time the recording paper 2 is fed by one step. (B)
Indicates a state where the data in the buffer has turned once, and (c)
Indicates a state in which the data in the buffer has rotated twice.
(D) shows the data content of the buffer when the input pointer IP and the output pointer OP are moved to the positional relationship sandwiching the point B in (c). In (d), since the buffers are ring-connected, the data at the position of the input pointer IP and the output pointer OP
There is an n-step phase difference between the data at the positions. That is, assuming that the data at the position of the input pointer IP is (n + m-1), the data at the position of the output pointer OP is (n + m-1)-(n + 1) = m, and the phase of n steps This means that the correction has been performed.

FIG. 8 is a flowchart for explaining the operation of the apparatus shown in FIG. First, the most recent maximum value stored in the internal memory of the arithmetic and control unit 5, the minimum and the average value is output to the memory 10 _2, 10 _3, and initializes the internal memory of the arithmetic and control unit 5. Subsequently, outputs predetermined data from the memory 10 _2, 10 ₃ to the servo system 11 _2, 11 _3. In outputting the data, one of the real-time measurement data, average value, average value-minimum value-average value-maximum value-average value is selectively output according to the feed speed of the recording paper 2. For example, the conversion cycle of the analog-to-digital converters 81 to 83 is 125 ms, and the resolution of the feed amount of the recording paper 2 is 0.1 mm.
(0.05 × 2), the feed speed of recording paper 2 x (mm /
FIG. 9 shows the relationship between h) and the number D of measured data. Here, in the state of 2880 ≦ x, 0 or 1 measurement data D
Therefore, if the number is zero, the measurement data in the previous step is output. If the number is one, the measurement data is output in real time. When 576 <x <2880, the average value of the measured data is output because the measured data becomes 1 to 5, and in the state of 288 <x ≦ 576 to x ≦ 72, the measured data becomes 5 or more. The average value, minimum value and maximum value of the measured data are output in the order of “average value−minimum value−average value−maximum value−average value”, and the width between the minimum value and the maximum value is recorded by a line segment. .

With such a configuration, the measurement is always performed at a constant cycle irrespective of the set value of the recording paper feed speed. As shown in FIG. 3, the monitorability does not deteriorate, and the recording paper 2 has no phase difference due to three pens.
A recording line corresponding to the magnitude of the analog input signal of the book is drawn.

In recording the width of the minimum value and the maximum value by a line segment, if the response speed of the recording pen is sufficiently faster than the recording paper feed speed, the line of the minimum value and the maximum value at all the feed speeds is obtained. Although minute recording can be performed, the response speed of a recording pen of an actual product is limited. Therefore, a relationship of t1 × 2 ≦ t2 is established between the minimum response time t1 of the recording pen and the time t2 of one step of recording paper feeding when the width of the minimum value and the maximum value is considered to be the entire recording paper width. Is controlled so that the width between the minimum value and the maximum value is recorded by a line segment only at the recording paper feed speed.

FIG. 10 is a flowchart showing a flow of such a conventional control. In FIG. 10, for example, in a state where the maximum value measurement data is added to the servo system, one-step feeding of the recording paper is instructed by an interrupt, and the minimum value measurement data is added to the servo system (step). . If the recording paper has not been sent, the recording paper is sent, and if so, the recording pen is moved toward the minimum value position (step). Then, the minimum response time t required for the recording pen to move over the entire width of the recordable area of the recording paper.
1 is set as a fixed standby time, and after the elapse of the standby time, the maximum measured data is added to the servo system (step). Thereby, the recording pen moves toward the maximum value position (step). Hereinafter, a series of steps are repeated.

[0012]

However, according to such conventional control, the recording operation is uniquely limited by the recording paper feed speed at the line segment between the minimum value and the maximum value. As a result, the variation of the measurement signal is relatively small, the amplitude of the minimum value and the maximum value is only a part of the recordable area of the recording paper, and the recording can be performed with a sufficient line segment in view of the response speed of the recording pen. However, there is a problem that recording cannot be performed with a line segment depending on the feeding speed of the recording paper. The present invention has been made in view of such a point, and an object of the present invention is to provide a pen recorder which can record the width of the minimum value and the maximum value by a line segment without being limited by the recording paper feed speed. Is to do.

[0013]

According to a first aspect of the present invention, there is provided a servo system for moving a recording pen in accordance with measurement data, and a fixed period independent of a period of a recording paper feed speed. An analog-to-digital converter for converting the magnitude of an analog input signal into a digital signal; a memory for storing at least a maximum value and a minimum value of measurement data within a recording paper feed cycle output from the analog-to-digital converter; Timing control means for controlling the timing of giving the maximum value and the minimum value of the measurement data within the recording paper feed cycle to the servo system based on the feed speed is provided.

According to a second aspect of the present invention, there is provided a servo system for moving a recording pen in accordance with measured data, and an analog system for converting a magnitude of an analog input signal into a digital signal at a constant period independent of a period of a recording paper feed speed. A digital converter, a memory for storing at least a maximum value and a minimum value of measurement data within a recording paper feed cycle output from the analog-digital converter, a recording paper feed speed, a current position of a recording pen, and the next recording. Timing control means for controlling the timing at which the maximum value and the minimum value of the measurement data in the recording paper feed cycle are given to the servo system based on the maximum value and the minimum value to be performed.

[0015]

According to the first aspect of the invention, the standby time until the start of recording in the direction of the minimum value (maximum value) when the recording pen records the maximum value (minimum value) is related to the feed speed of the recording paper. Is set. Thereby, when the feeding speed of the recording paper is comparatively slow t1 × 2 ≦ t2, the amplitude by the recording pen is 100%.
Is guaranteed, and the recording paper feed speed is relatively high, and when t1 × 2> t2, the recordable amplitude of the recording pen gradually decreases as the feed speed increases.

According to the second aspect, when the recording pen records the maximum value (minimum value), the standby time until the start of recording in the minimum value (maximum value) direction depends on the recording paper feed speed and the recording speed. It is set based on the current position of the pen and the maximum and minimum values to be recorded next. Accordingly, in addition to the first aspect, t2 is allocated and allocated according to the moving distance of the recording pen.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of one embodiment of the present invention, and shows an example of one pen. In the figure, reference numeral 12 denotes a recording paper feed speed setting unit, and 13 denotes a data timing control unit. The data timing control unit 13 determines the time t of one step of recording paper feed set by the recording paper feed speed setting unit 12.
The timing at which the maximum value or the minimum value of the measurement data stored in the memory 10 is given to the servo system 11 is controlled in accordance with 2.

FIG. 2 is a flowchart showing a control flow in the configuration of FIG. In FIG. 2, for example, in a state where the maximum value of the measurement data is added to the servo system, a one-step feed of the recording paper is commanded by an interrupt, and
The minimum measurement data is added to the servo system (step). If the recording paper has not been sent, the recording paper is sent, and if so, the recording pen is moved toward the minimum value position (step). Then, the recording paper feed speed setting unit 12
After the elapse of the standby time (for example, t2 / 2) set based on the time t2 of one step of the recording paper feed set in step (1), the maximum measured data is added to the servo system (step). Thereby, the recording pen moves toward the maximum value position (step). Hereinafter, a series of steps are repeated.

For example, as shown in FIG. 3, P1 → P2 → P3
When recording is performed in the order of → P4 → P5 → P6 → P7, an interruption of one-step feed of the recording paper is added while the measurement data of the maximum value P1 is added to the servo system, and the following is added to the servo system. The measurement data of the minimum value P2 is added.
As a result, the recording paper is fed one step, and the recording pen moves from P1 to P2 to perform line segment recording.
Then, after a lapse of one-step feed time t2 since the measurement data of the minimum value P2 is added to the servo system, the measurement data of the maximum position P3 to be recorded next is given to the servo system. To P3 to perform line segment recording. Hereinafter, the same processing is repeatedly executed.

Thus, when the feeding speed of the recording paper is relatively slow t1 × 2 ≦ t2, the amplitude by the recording pen is 100
Percentage records are guaranteed. When the feeding speed of the recording paper is relatively high and t1 × 2> t2, the amplitude that can be recorded by the recording pen gradually decreases as the feeding speed increases. When the speed becomes equal to or higher than the preset speed, line segment recording with a width between the maximum value and the minimum value is not uniquely prohibited, and line segment recording is performed as much as possible. Therefore, when the fluctuation of the measurement signal is relatively small and the amplitudes of the minimum value and the maximum value are only a part of the recordable area of the recording paper, a substantial line segment is obtained even if the recording paper feed speed is relatively high. Can record.

In the embodiment shown in FIG. 2, the timing at which the maximum value of the measured data within the recording paper feeding cycle is given to the servo system based on the recording paper feeding speed is set to half the time t2 of one step. Although the control example has been described, depending on the current position of the recording pen and the magnitudes of the minimum value and the maximum value to be recorded next, a fixed ratio of 1/2 may cause an excess or deficiency in time.

In this regard, a pen position data processing unit 14 is provided as shown by a broken line in FIG. 1, and based on the current position of the recording pen and the minimum and maximum values to be recorded next, in addition to the feed speed of the recording paper. Then, the timing at which the maximum value of the measurement data to be recorded next is given to the servo system is controlled. That is, the distribution ratio of the time t2 may be changed according to the length of the moving distance of the recording pen.

In FIG. 3 described above, when the trajectory of the recording pen from P1 to P2 to P3 is compared with the trajectory of the recording pen from P3 to P4 to P5, the moving distance of P1 to P2 and P2 to P2 are compared.
Although the moving distance of P3 is substantially equal, the relationship between the moving distance of P3 → P4 and the moving distance of P4 → P5 is approximately 1: 4. Therefore, in this case, the data update from P2 to P3 may be performed after elapse of t2 / 2 after P2 is added.
The data is updated from 4 to P5 at t2 after P4 is added.
It may be performed after elapse of / 5. As a result, the time t2 is distributed and assigned at a rate corresponding to the moving distance of the recording pen from the maximum value to the minimum value to the next maximum value, and a stable recording operation can be obtained.

Further, in the above embodiment, the feed time t2 of one step of the recording paper itself is used as the standby time. However, a time table having a plurality of stages is prepared in advance according to the length of the feed time t2. The standby time assigned according to the sending time of the data may be read.
According to this, the calculation processing time becomes unnecessary, and high-speed processing can be performed.

Further, in the above embodiment, the recording pen has a maximum value such as P1 → P2 → P3 → P4 → in FIG.
In the sequence of the minimum value → the next maximum value → the next minimum value →..., The moving is performed in a fixed direction. However, when a repetitive waveform of a triangular wave is recorded in such a recording form, as shown in FIG. There is a problem that the recording quality greatly changes depending on the direction in which the recording waveform changes.

Such a disadvantage is caused by the fact that the pen position data processing unit 14 in FIG. 1 calculates the moving distance of the recording pen when recording from the maximum value to the minimum value and when recording in the opposite direction. The problem can be solved by appropriately changing the moving direction of the recording pen so as to perform recording in the direction in which the moving distance is short. As a result, the recording waveform of FIG. 4 is improved as shown in FIG. And by always moving the recording pen at the shortest distance in this way, the responsiveness of recording increases,
The fidelity of the recording waveform can be increased.

The recording pens used in the present invention are not limited to ink pens, but include inkless pens such as thermal recording pens.

In each of the above embodiments, a recorder having a one-pen structure has been described. However, the present invention is also effective for a phase-locked multi-pen recorder similar to the prior application.

[0029]

As described above, according to the present invention,
It is possible to realize a pen recorder that can record the width between the minimum value and the maximum value with a line segment without being limited by the recording paper feed speed.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a control flow in the configuration of FIG.

FIG. 3 is an explanatory diagram of a recording operation of the apparatus of FIG. 1;

FIG. 4 is a diagram illustrating an example of recording a triangular waveform by the apparatus of FIG. 1;

FIG. 5 is a diagram showing an example of an improved recording of a triangular waveform by the apparatus of FIG. 1;

FIG. 6 is a configuration explanatory view showing an example of a conventional device.

7 is an explanatory view of the principle of the memory 10 _2, 10 ₃ for use in FIG.

FIG. 8 is a flowchart illustrating the operation of the device in FIG. 6;

FIG. 9 shows a recording paper feed speed x (mm /
FIG. 7 is an explanatory diagram showing the relationship between h) and the number D of measurement data.

FIG. 10 is a flowchart showing a control flow in the configuration of FIG. 6;

[Description of Signs] 1 ... Recording pen 2 ... Recording paper 3 ... Platen 4 ... Recording paper feed mechanism 5 ... Operation control unit 6 ... Input terminal 8 ... Analog digital converter 10 ... Memory 11 ... Servo system 12 ... Recording paper feed speed Setting unit 13 Data timing control unit 14 Pen position data processing unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01D 9/00-9/42

Claims (2)

(57) [Claims] 1. A servo system for moving a recording pen in accordance with measurement data, and an analog-to-digital converter for converting the magnitude of an analog input signal into a digital signal at a constant period independent of the period of the recording paper feed speed. A memory for storing at least a maximum value and a minimum value of measurement data within a recording paper feed cycle output from an analog-to-digital converter, and a measurement data within a recording paper feed cycle based on a recording paper feed speed. And a timing control unit for controlling the timing of giving the maximum value and the minimum value. 2. A servo system for moving a recording pen in accordance with measurement data, and an analog-to-digital converter for converting the magnitude of an analog input signal into a digital signal at a constant period independent of the period of the recording paper feed speed. A memory for storing at least the maximum value and the minimum value of the measured data within the recording paper feed cycle output from the analog-to-digital converter, the recording paper feed speed, the current position of the recording pen, and the maximum value to be recorded next; A pen recorder, further comprising timing control means for controlling the timing of giving the maximum value and the minimum value of the measurement data within the recording paper feed cycle to the servo system based on the minimum value.