JP2611013B2 - Circular chart recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circular chart recorder, and more particularly to time adjustment of a circular chart.

<Prior Art> One type of recorder is a circular chart recorder using a circular chart as shown in FIG.

By the way, when recording is performed using a circular chart provided with a time scale in advance as shown in FIG. 4, the current time and the time scale of the circular chart are recorded at the recording position in order to guarantee the time relationship between the measurement results. It is desirable to make them match.

<Problems to be Solved by the Invention> However, in the conventional circular chart recorder, such automation of time alignment is not considered, so that the operator has to make manual adjustments each time the circular chart is replaced or recording is restarted. And the operability was poor.

The present invention focuses on such a point, and an object of the present invention is to provide a circular chart recorder that can automatically match the current time with the time scale of the circular chart at a recording position.

<Means for Solving the Problems> A circular chart recorder according to the present invention includes a circular chart provided with a time scale in advance, a mark indicating a reference position provided in a part thereof, a circular chart attached to and detached from a table, and a circular chart attached to a table. A chart detection mechanism that detects that the is set and outputs a chart detection signal, a mark detection mechanism that detects a reference position mark of the circular chart set on the table and outputs a mark detection signal, and a mark detection mechanism that is set on the table A chart driving mechanism for rotating and driving the circular chart, and calculating the rotation angle of the circular chart necessary to match the current time and the time scale of the circular chart at the recording position based on the chart detection signal and the mark detection signal, And a calculation control unit that controls the chart drive mechanism in accordance with the calculation result.

<Operation> The arithmetic control unit checks that the circular chart is set in the table based on the chart detection signal, and then matches the current time and the time scale of the circular chart at the recording position based on the mark detection signal. The necessary rotation angle of the circular chart is calculated, and the chart driving mechanism is controlled according to the calculation result to rotate the circular chart by a predetermined angle.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention,
(A) shows a top view of each component, and (b) shows a cross-sectional view of each component. The circular chart 1 is provided with a time scale and a part thereof is provided with a slit 2 as a mark indicating a reference position. This circular chart 1
Is attached to and detached from a rotating shaft 4 penetrating the table 3 via a chart retainer 5, and is rotatably mounted on the table 3.
On the lower surface of the table 3, an actuator 7 of the small switch 6 is provided as a chart detection mechanism for detecting that the circular chart 1 is set and outputting a chart detection signal so as to protrude from the mounting surface of the circular chart 1. ing. On the lower surface of the table 3, a reflection type photo interrupter 8 is provided as a mark detection mechanism for detecting the reference position mark 2 of the circular chart 1 set on the table 3 and outputting a mark detection signal. The photo interrupter 8 is disposed so as to face the slit 9 provided on the table 3 so as to overlap the slit 2 of the circular chart 1. On the holding surface of the chart holder 5, a mirror 10 is provided concentrically so as to face the slit 2 of the circular chart 1 and the slit 9 of the table 3. The rotating shaft 4 is driven to rotate by a chart driving mechanism 11 including a motor. The chart drive mechanism 11 is an arithmetic control unit 12
Is controlled by The arithmetic control unit 12 receives a chart detection signal from the chart detection mechanism 6, a mark detection signal from the mark detection mechanism 8, and a current time data from the clock circuit 13. And the arithmetic control unit
Numeral 12 calculates the rotation angle of the circular chart 1 required to make the time scale of the circular chart 1 coincide with the recording position, and controls the chart driving mechanism 11 to rotate the rotary shaft 4 by a predetermined angle according to the calculation result.

The operation of the apparatus thus configured will be described with reference to the flowchart of FIG.

First, it is determined whether or not the actuator 7 of the small switch 6 is pressed to output a chart detection signal. When the chart detection signal is detected, the rotation shaft 4 is rotated once to determine the presence or absence of the circular chart 3. . Here, the actuator 7 of the small switch 6 may be pressed even if the chart holder 5 is attached to the rotary shaft 4 without sandwiching the circular chart 1. On the other hand, the circular chart 1 is formed so as to absorb the output light of the photo-interrupter 8, and the slit 2
Is reflected by the mirror 10 of the chart holder 5 only at the position of. Therefore, as described above, the rotation shaft 4 is rotated once, and the presence or absence of the circular chart 3 is determined from a change in the output signal of the photo interrupter 8.

If the circular chart 1 is not set, the operation is held until it is set.

When the circular chart 1 is set, the rotation shaft 4 is rotated again to detect the slit 2, and when the slit 2 is detected, the rotation is stopped. Thus, the circular chart can always be stopped at a fixed reference position. During the stop period, the rotation angle of the circular chart 1 required to make the time scale printed on the circular chart coincide with the current time data input from the clock circuit 13 at the recording position is calculated. Then, the chart driving mechanism 11 is controlled in accordance with the calculation result, and the circular chart 1 is rotated by a necessary angle to match the time scale of the circular chart 1 at the recording position with the current time.

 As a result, a recording standby state is set.

With this configuration, the presence / absence of a circular chart can be detected, so that a recording operation in a state where the circular chart is not set can be prevented.

In addition, the time scale of the circular chart 1 at the recording position and the current time can be automatically made to coincide with each other prior to the start of recording, so that the time required for replacing the circular chart can be reduced, and the time accuracy of the recording result can be greatly improved. Can be done.

In addition, since the time is always adjusted not only when the chart is replaced but also when the power is turned on, the time accuracy of the recording result is increased.

If necessary, the recording start position can always be set as the parent scale of the time scale irrespective of the current time. In this case, the angle from the slit 2 of the circular chart 1 to the nearest parent scale may be set in the arithmetic control unit 12 in advance. By performing such recording, it is easy to compare the time lapse between a plurality of recording results.

<Effect of the Invention> As described above, according to the present invention, it is possible to realize a circular chart recorder that can automatically match the current time with the time scale of the circular chart at the recording position.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of FIG. 1, and FIG. 3 is an explanatory diagram showing an example of a circular chart. 1 ... circular chart, 2 ... slit, 3 ... table, 4 ... rotary axis, 5 ... chart holder, 6 ... small switch, 7 ... actuator, 8 ... photo interrupter, 9 ... slit, 10: mirror, 11: chart drive mechanism, 12: arithmetic control unit, 13: clock circuit.

Claims (1)

(57) [Claims] 1. A time scale is provided in advance, a mark indicating a reference position is provided in a part, a circular chart attached to and detached from a table, and a chart detection signal for detecting that a circular chart is set on the table. A chart detection mechanism that detects a reference position mark of the circular chart set on the table and outputs a mark detection signal; a chart drive mechanism that rotationally drives the circular chart set on the table; Calculation control for calculating the rotation angle of the circular chart required to match the current time and the time scale of the circular chart at the recording position based on the chart detection signal and the mark detection signal, and controlling the chart driving mechanism according to the calculation result. A circular chart recorder, comprising: