JPH0419485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a digital transmission, more specifically, a base part, a first rotating part having a collimating telescope and supported by the base so as to be rotatable about a vertical axis; A multi-axis type having a second rotating part that is rotatably supported with respect to the base part and the collimating telescope about the same vertical rotation axis as the first rotating part,
This invention relates to digital transmission that can be measured by double angle measurement. Here, the double angle measurement method is used to reduce the effects of errors due to observation operations such as collimation and reading, as well as errors due to structural defects in the transit or imperfect adjustment. As shown in FIG. 1, the method is to set the transit at point O, fix the base, and collimate point A by rotating the first rotating part fixed to the second rotating part (upper board). The measured value at this time is α ₀ . Next, point B is sighted by making the first rotating part rotatable while keeping the second rotating part fixed to the base part. Next, the first rotating part was fixed to the second rotating part and point A was sighted again, and then the second rotating part was fixed to the base part, and the first rotating part was made rotatable to aim at point B. Aim. Let α _o be the cumulative measurement value obtained by measuring n times in this manner. Then, the angle α of <AOB is determined by α=α _o −α ₀ /n.

By the way, conventional multi-axis transits are generally configured to read angles on a 360 degree scale. Therefore, if the rotation angle exceeded 360 degrees, it was necessary to memorize the rotation speed k of the collimating telescope and add the value (360 degrees x k) to the value read on the minute scale. Therefore, when measuring angles using the double angle measurement method using the above-mentioned conventional multi-axis transit, the cumulative measurement value obtained by measuring n times is
When the angle exceeded 360 degrees, there was a problem that the measurement work became complicated.

The present invention aims to provide a multi-axis digital transmitter that solves the above-mentioned conventional problems, and its structural features include a base portion, a collimating telescope, and a vertical a first rotating part rotatably supported by the base about an axis;
a second rotating part rotatably supported relative to the base part and the first rotating part about the same vertical rotational axis as the first rotating part; and a second rotating part between the first rotating part and the second rotating part. A measuring section that measures relative angular displacement using a binary signal, a digital display section that displays the measured value of the measuring section, and a digital display section that displays a zero value when the measurement result of the measuring section reaches 360 degrees. and a clearing suppressing section that selectively suppresses the clearing function of the digital display clearing section.

Embodiments of the present invention will be described below based on the drawings. The mechanism of the multi-axis digital transit 1 is as follows:
As shown in FIG. 2, the base part 2 and the collimating telescope 4
is supported rotatably around a horizontal axis 6, and a vertical axis 8
The first rotating part 10 is rotatably supported by the base part 2 about the base part 2, and the second rotating part (upper board) is rotatably supported by the base part 2 and the first rotating part 10 about the vertical axis 8. ) 12, and an angle measuring system 14 that measures the relative angular displacement between the first rotating section 10 and the second rotating section 12 using a binary code. The second rotating section 12 includes a first clamp screw 16 that integrates the second rotating section 12 and the first rotating section 10, and a second clamp screw 18 that integrates the second rotating section 12 and the base section 2. have As shown in FIGS. 2 and 3, the angle measurement system 14 includes a light source 20 attached to the first rotating section 10, a condenser lens 22, an index slit 24, and two light receiving elements 26 and 28.
It consists of a code plate 30 attached to the second rotating part 12. The index slit 24 has a phase of 90
Two slit groups 24 arranged at different degrees
It consists of a and 24b.

The first embodiment of the calculation display circuit for the outputs of the light receiving elements 26 and 28 is as shown in FIG.
The outputs of 6 and 28 are connected to amplifiers 32 and 34 and comparator 3.
6, 38 to the direction discrimination circuit 40. The direction discrimination circuit 40 is connected to a digital display 46 via a counter 42 and an arithmetic unit 44. The counter 42 includes a counter 52, a comparator 54, a selector 56, and a clear circuit 58, as shown in FIG. On the other hand, a clear selection switch 48 is connected to a selector 56 of the counter 42 via a clear suppression signal generator 50.

In the above circuit configuration, the light receiving elements 26, 28
The two angle signals having a phase difference of 90 degrees detected by the sensor are amplified by amplifiers 32 and 34, and converted into square waves by comparators 36 and 38, and both angle signals are subjected to direction discrimination. The circuit 40 divides the signal into an output a that causes the counter to perform a positive count, and an output b that causes the counter to perform a negative count, and inputs the output to the counter 42 . The pulse count value counted by the counter 42 is converted into an angle value by the calculator 44 and displayed on the digital display 46.
and displayed as the detected angle value. The comparison circuit 54 compares the count value of the counter 52 with a preset value (360°), and when the count value matches the preset value, sends a signal to the clear circuit 58 via the selector 56. Output. When the clear circuit 58 receives the signal from the comparison circuit 54, it clears the counter 52.
Let the count value of be zero. The selector 56 disconnects the line from the comparator 54 to the clear circuit 58 according to the output of the clear suppression signal generator 50, and disconnects the line when the clear suppression signal is output, and when the clear suppression signal is not output. When the line is connected.

When the clear selection switch 48 is OFF, the clear suppression signal generator 50 does not generate a clear suppression signal, and the counter 42 is cleared to a zero value by the action of the clear circuit every time its count value exceeds 360°. This is similar to the function of conventional digital transit. When performing double angle measurement where the cumulative angle value exceeds 360°, set clear selection switch 48.
It is turned ON to cause the clear suppression signal generator 50 to generate a clear suppression signal, suppress the action of the clear circuit of the counter 42, and start measurement. Therefore, even if the cumulative angle value exceeds 360°, it will not be cleared midway through, and the value will be displayed as is on the digital display 4.
6. The measured value is displayed on the digital display 46.
Calculate by dividing the cumulative angle value displayed by the number of double angle measurements.

A reference example of a circuit for calculating and displaying the outputs of the light-receiving elements 26 and 28 is shown in FIG. 6, but circuit configurations that are the same as those in the above-described embodiments of the present invention are given the same reference numerals and explanations thereof will be omitted. A double angle measurement number setter 60 is connected to the arithmetic unit 44, and a double angle measurement number setter 60 consisting of a rotary switch or the like is connected to the clear suppression signal generator 50 via a discrimination circuit 62. Furthermore, the calculation unit 44 includes a measurement end switch 6.
8 are connected.

In the above circuit configuration, one or more double angle measurement times are set in the double angle measurement number setting device 60,
The determining circuit 50 determines whether the number of times is 1 or any other number. When the number of double angle measurements is set to 1, the clear suppression signal generator 50 does not generate a clear suppression signal, and therefore, when the count value of the counter reaches 360°, the counter is cleared as before. When the double angle measurement count is set to a value other than 1, in other words, when double angle measurement is to be performed, this is determined by the discrimination circuit 50, a clear suppression signal is generated by the clear suppression signal generator 50, and the clear suppression signal is output to the selector 56 of the counter 42. Clearing of the counter during 360° counting is suppressed by being output to . The counter 42 counts the angle pulses generated during double angle measurement until a measurement end signal is input by the measurement end switch 68.

The digital display 46 displays the cumulative angle value that has not been cleared. When the double angle measurement is completed, the measurer operates a measurement end switch to generate a measurement end signal. Upon receiving the measurement end signal, the calculator 44 divides the cumulative angle value by the double angle measurement count value set in the double angle measurement count setter. The result of the calculation is the measured angle value, which is displayed on the digital display 46.

Since the present invention is configured as described above, even if the cumulative measurement value exceeds 360° by the double angle measurement method,
It is possible to selectively display the cumulative measurement value over 360° as it is, making it easy to read the cumulative measurement value and without any reading errors. Therefore, the measurer can concentrate on collimation adjustment, which has the effect of improving measurement accuracy.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the double angle measurement method, Fig. 2 is an explanatory diagram of the digital transmission according to the embodiment of the present invention, and Fig. 3 is an enlarged explanatory diagram of the angle display system of Fig. 2.
FIG. 4 is a block diagram of the first embodiment of the arithmetic and display circuit, FIG. 5 is a block diagram of a counter, and FIG. 6 is a block diagram of a reference example of the arithmetic and display circuit. 1...Digital transit, 2...Base part, 4
... Sighting telescope, 10... First rotating section, 12... Second rotating section, 14... Angle measurement system, 16... First clamp screw, 18... Second clamp screw, 30... Code plate.

Claims (1)

[Claims] 1 a base part, a first rotating part having a collimating telescope and supported by the base part so as to be rotatable about a vertical axis; a second rotating section rotatably supported with respect to the first rotating section; a measuring section that measures relative angular displacement between the first rotating section and the second rotating section using a binary signal; a counter for calculating the output of the counter, an arithmetic unit that converts the pulse count output from the counter into an angle value, a digital display unit that displays the output from the arithmetic unit, and an output of the arithmetic unit that is 360° 1. A double-axis digital transmitter comprising: a digital display clear section that sets a digital display section to zero when