JP2563209B2 - Circular chart recorder - Google Patents

Description

The present invention relates to a circular chart recorder, and more particularly to an improvement of a recording mechanism.

<Prior Art> One type of recorder is a circular chart recorder configured to record the magnitude of an analog input signal along the radial direction of a circular chart provided with time scales along the circumferential direction.

FIG. 8 is a structural explanatory view showing an example of such a circular chart recorder in the related art. In the apparatus shown in FIG. 8, four pens P1 to P4 having different arm lengths are arranged so that their fulcrums coincide with each other. The circular chart 1 is provided with a plurality of time scales 2 at regular intervals along the circumferential direction.
The time scale 2 is provided so as to correspond to the locus of the pen P1 having the shortest arm among the four pens P1 to P4.

In such a configuration, the circular chart 1 is rotationally driven at a wide range of set speed ranging from 1 hour to 4000 hours per rotation. On the other hand, the pens P1 to P4 are displaced along the radial direction of the circular chart 1 in accordance with the magnitude of the analog input signal, and the magnitude of the analog input signal is recorded on the circular chart 1.

According to the circular chart recorder thus configured, since the entire recording result always appears on the circular chart 1, there is an advantage that the change state of the analog input signal over a long period of time can be grasped at a glance. However, it is widely used in various fields as a recording means of a measurement result with a relatively gentle fluctuation. <Problems to be solved by the invention> However, such a conventional circular chart recorder has the following problems. is there.

As the number of recording pens increases, the number of drive elements increases, the number of parts also increases, and miniaturization becomes difficult.When installing multiple recording pens, the arm length of each recording pen is made different and A gap must be secured. As a result, the radius of the locus of the circular arc recorded by each recording pen depends on the arm, and it is impossible to synchronize (phase) the recording coupling time on the chart. For this reason, it is difficult to perform signal analysis based on a plurality of recording results while considering the mutual time relationship.

When exchanging the circular chart, each recording pen must be moved up from the circular chart and moved to a position where it does not get in the way, which requires a considerable amount of time for the work.

Since the recording with the recording pen is an arc writing, the scale along the arc is not linear.

A mechanism for rotating the circular chart is required.

A plurality of recording pens are always positioned on the circular chart when reading the recording path, which may be an obstacle.

The present invention focuses on such a point, and an object thereof is to provide a circular chart recorder that solves the inconvenience caused by a recording pen that performs arc writing.

<Means for Solving the Problems> The circular chart recorder of the present invention is configured to record the magnitude of an analog input signal along the radial direction of a circular chart provided with time scales along the circumferential direction. In a circular chart recorder, the carriage moving means that moves the carriage on which the recording head is mounted in the X and Y directions on the circular chart, and the recording position on the circular chart are calculated based on the magnitude of the time signal and analog input signal. Recording position calculation means, the carriage is stopped at a rest position outside the recording area of the circular chart during non-recording, the carriage is moved to a predetermined recording position calculated by the recording position calculation means during recording, and the recording head is selectively operated. It is characterized by comprising a recording control means for driving to perform recording.

<Operation> The carriage to which the recording head is attached rests outside the recording area of the circular chart during non-recording, and during recording, the carriage moving mechanism is operated according to the recording position calculation result based on the magnitude of the time signal and the analog input signal. Is selectively moved to the recording position on the circular chart. And
The recording head is selectively driven to record on the circular chart when the carriage reaches a predetermined recording position.

<Example> Hereinafter, the example of the present invention is described in detail using a drawing.

FIG. 1 is a configuration block diagram showing an embodiment of the present invention. The circular chart 3 is mounted on a flat chart bed which does not rotate. An X-axis arm 4 and a Y-axis arm 5 are arranged on the circular chart 3. A carriage 7 to which a Y-axis arm 5 is slidably attached to the X-axis arm 4 and a recording head including a plurality of recording elements 6 such as a recording pen that can be moved up and down is attached to the Y-axis arm 5. Is slidably mounted. The Y-axis arm 5 is moved in the X-axis direction by the X-axis drive mechanism 8, and the carriage 7 is moved in the Y-axis direction by the Y-axis drive mechanism 9. A plurality of analog input signals applied to the input terminal 10 are applied to the recording position calculation circuit 12 via, for example, a measurement circuit 11 provided with an A / D converter for each measurement channel. A time signal is also applied from the input terminal 13 to the recording position calculation circuit 12, and the recording position on the circular chart 3 is calculated based on the magnitudes of the time signal and the analog input signal. The calculation result of the recording position is added to the recording control circuit 14. The recording control circuit 14 stops the carriage 7 at a rest position outside the recording area of the circular chart 3 at the time of non-recording, moves the carriage 7 to a predetermined recording position calculated by the recording position calculation circuit 12 and performs recording. The recording element 6 of the head is selectively driven according to the measurement channel to control recording.

FIG. 2 is an external view showing a specific example of FIG. 1, and the same parts as those in FIG. 1 are designated by the same reference numerals. Reference numeral 15 is a motor that constitutes the X-axis drive mechanism 8, and reciprocates the Y-axis arm 5 along the X-axis arm 4. Reference numeral 16 is a motor that constitutes the Y-axis drive mechanism 9, and moves the carriage 7 back and forth along the Y-axis arm 5.

 The operation of the apparatus configured as described above will be described.

Here, for example, the circular chart 3 has a maximum radius of 100 mm and a recording resolution of 0.1 mm, and each analog input signal is sampled every 100 ms and rotates once in 24 hours. Data shall be recorded intermittently. Under such a condition, the total length of the circumference of the maximum radius of the circular chart 3 is about 630 mm, and therefore the resolution is converted to about 6300 steps, and the measurement data for 30 minutes is recorded in about 130 steps. In this case, 1
The number of measurement data per step is close to 140.

The recording position calculation circuit 12 sequentially temporarily stores the measurement data of the analog input signal applied from the measurement circuit 11 in the internal memory together with the time data. Then, at each step, the maximum value, the minimum value, the average value, etc. are obtained from the measurement data of nearly 140 pieces within the measurement period, and the values from the maximum value, the minimum value, the average value, etc.
It is converted into the recording position data represented by the X and Y coordinates above and stored in the internal memory. Then, for example, when the maximum value / minimum value recording mode is set, the maximum value data and the minimum value data are output to the recording control circuit 14 as the recording data at each step, and the average value recording mode is set. In this case, average value data is output to the recording control circuit 14 as recording data for each step. When outputting these print data, in order to maintain the continuity of the print results, the previous last print data is output first, and then the data according to the set print mode is output. And
The final recording data is stored as the next recording start data. Further, the recording position calculation circuit 12 can output recording data for recording a character / symbol pattern, if necessary.

In this way, the recording control circuit 14 is a recording position calculation circuit.
The carriage 7 is moved according to the print data added from 12, and the up / down movement of the print element 6 is controlled. FIG. 3 is an example of a locus of the recording element 6 when the maximum / minimum value recording mode is set. T ₀ , T ₁ , ... Represents a period recorded by one recording operation, and Son− ₁ , Son,
S _11, ... denotes the recording step in the recording period.
HP is a rest position of the carriage 7 provided outside the recording area of the circular chart 3 during non-recording. The recording control circuit 14 outputs the minimum value data and the maximum value data for each step as X and Y coordinate data on the circular chart 3 to the X-time drive mechanism 8 and the Y-axis drive mechanism 9. Step Son-
_{In 1} , the minimum value data P ₁ and the maximum value data P ₂ of the measured data after the previous step Son- ₂ is input and the line segment connecting them is recorded. In step Son, the previous step Son- _{1 and} after. The minimum value data P ₃ and the maximum value data P ₄ of the measurement data of are input and the line segment recording connecting them with a straight line is performed. The maximum value data P recorded in step Son- _1
A straight line should be connected between ₂ and the minimum value data P ₃ recorded in step Son. By recording the maximum value data P ₄ in step Son, the recording of the period T ₀ is completed and the recording element 6 is moved up. The carriage 7 returns to the rest position HP and waits for the recording command of the next period T ₁ . The carriage 7 is moved to the position of the maximum data P _{4 in} step Son again by the recording command for the period T ₁ after the set fixed time has elapsed, and the recording from step S ₁₁ is executed. In this way, by recording the maximum data P ₁₂ in step P ₁ n, the recording of the period T ₁ is completed, the recording element 6 is moved up, the carriage 7 returns to the rest position HP, and the recording of the next period T ₂ is performed. Wait for a command. Thereafter, the same operation is repeated intermittently to complete the recording corresponding to one rotation of the conventional circular chart.

Here, since the recording step interval on the circular chart 3 is set to be narrower than the recording width of the recording element 6, the recording result by the line segment connecting the maximum value data and the minimum value data of the adjacent steps is practical. Can be ignored.

With such a configuration, the following effects can be obtained.

Since the plurality of recording elements are attached to the common carriage, the number of parts can be reduced and the size can be reduced as compared with the conventional plurality of recording pen types.

Since the recording position data is given as X and Y coordinate data, there is no phase difference between the recording results of multiple channels, and signal analysis can be performed based on multiple recording results without being aware of the time relationship. You can

When exchanging the circular chart, it is sufficient to move the carriage out of the recording area of the circular chart, and the exchanging can be easily performed.

Since the recording position data is given as X and Y coordinate data, there is no inconvenience caused by arc writing as in the past, and the scale is linear.

Since the recording position data is given as X and Y coordinate data, a mechanism for rotating and driving the circular arc chart is not required, and the structure is simplified.

When the recording locus is read, the carriage is stopped at the rest position outside the recording area of the circular arc chart during non-recording, so that the entire recording locus can be read without being disturbed by the carriage or the like.

Note that, in FIG. 3, when the carriage is moved from the minimum value to the maximum value for each step and then moved to the adjacent step, the carriage is moved from the maximum value to the minimum value. When moving to the minimum value and moving to the next step, it may be moved from the minimum value to the maximum value, or when moving to the next step, moving from the maximum value to the maximum value or from the minimum value to the minimum value. You may let me.

In the above embodiment, the carriage is provided with a plurality of recording elements, and the recording elements corresponding to the measurement channels are selectively driven up and down to perform recording. However, a plurality of recording elements are provided in a part of the recorder case. The recording element storage unit may be provided, and the recording element corresponding to the measurement channel may be replaced by the carriage for recording. With such a configuration, it is possible to realize multiple colors (multiple pens) without increasing the shape of the recording head.

It is also conceivable to incorporate a controller or a program controller in the recorder configured as described above and record the set value and the measured value in multiple colors on the same time axis. For example, in the case of incorporating a temperature program controller, the carriage is moved at high speed in advance according to the temperature profile according to the control program to record the temperature profile as shown in FIG. Should be recorded in different colors. According to this, a setting error can be prevented and the relationship between the set value and the measured value can be accurately grasped.

Also, a part of the circular chart is provided with a plurality of positioning marks for setting the relative position to the print scale with respect to the moving direction of the carriage, and a sensor for reading these marks is provided on the carriage, and these marks are set prior to the start of recording. By reading the mark, the recording position can be calculated while correcting the deviation of the time axis when the circular chart is loaded. According to this, the loading position accuracy of the circular chart can be relaxed, and since the rotation of the circular chart becomes unnecessary, the roll chart as shown in FIG.
It is also possible to use a preprinted circular chart pattern on 17. When positioning the roll chart 17, positioning marks or notches may be provided in the roll chart 17, and the marks or notches may be detected by the positioning sensor 18 provided on the recorder side. According to this, when the recording of one sheet is completed, the roll chart 17 needs to be sent for one sheet of the circular chart, and the replacement work of the conventional circular chart can be greatly reduced. The roll chart after recording may be wound up or may be drooped as indicated by a chain double-dashed line.

Further, in FIG. 5, it is possible to use a plain roll chart and draw a scale pattern as a circular chart before recording. According to this structure, the positioning condition of the roll chart can be relaxed.

By the way, when the recorded circular chart is stored, as shown in FIG. 6, the circular chart 3 is inserted into the rod 20 by using the hole 19 at the center thereof. When the roll chart 17 as shown in FIG. 5 is used, it is difficult to adapt to such a storage form. Such a problem can be solved by providing perforations in advance on the outer peripheral portion of the circular chart 3 so that the printed circular chart 3 portion can be easily separated.

FIG. 7 is a structural explanatory view of another embodiment of the present invention, and the same parts as those in FIG. 5 are designated by the same reference numerals. The embodiment of FIG. 7 is a pen exchange type, and the carriage 21 is attached to the door 21 by X, Y.
X-axis arm 4 and Y-axis arm 5 for recording by moving in the direction
A recording mechanism such as
22 is also attached. With such a configuration, the entire surface of the roll chart 17 is opened when the door 21 is opened, which facilitates loading work of the roll chart 17 and maintenance work of the internal unit and operation panel. It will also be easier to perform operations such as 23. Such a configuration is also effective when using a conventional circular chart.

<Effects of the Invention> As described above, according to the present invention, it is possible to automatically match the current time and the time scale of the circular chart at the recording position, which solves the inconvenience caused by the recording pen that performs arc writing. A circular chart recorder that can be realized can be realized.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, and FIG.
FIG. 4 is an external view showing a specific example of FIG. 1, FIG. 3 is an explanatory view of the recording operation of FIG. 1, FIG. 4 is an explanatory view of another recording operation, and FIG.
FIG. 7 is an external view showing another embodiment of the present invention, FIG. 6 is an explanatory view of a storage state of a circular chart, FIG. 7 is also an external view showing another embodiment of the present invention, and FIG. 8 is a conventional circular shape. It is an external view showing an example of a chart recorder. 3 ... Circular chart, 4 ... X-axis arm, 5 ... Y-axis arm, 6 ... Recording element, 7 ... Carriage, 8 ... X-axis drive mechanism, 9 ... Y-axis drive mechanism, 10 ... Analog input signal input terminal, 11 …… Measuring circuit, 12 …… Recording position calculation circuit, 13 …… Time signal input terminal, 14 …… Recording control circuit.

Claims (1)

(57) [Claims] 1. A circular chart recorder configured to record the magnitude of an analog input signal along a radial direction of a circular chart provided with time scales along a circumferential direction, wherein a recording head is attached. Carriage moving means that moves the carriage in the X and Y directions on the circular chart, recording position calculation means that calculates the recording position on the circular chart based on the magnitude of the time signal and analog input signal, and the carriage when not recording. A recording control unit that stops at a rest position outside the recording area of the circular chart, moves the carriage to a predetermined recording position calculated by the recording position calculation unit, and selectively drives the recording head to perform recording during recording. A circular chart recorder characterized by being provided.