JPH0476797B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rail-type or arm-type flexible parallel ruler, and more specifically, the present invention relates to a rail-type or arm-type flexible parallel ruler. The present invention relates to a display device for digitally and accurately displaying information on a display.

[Conventional technology]

In this type of device, an encoder consisting of a disc-shaped or elongated encoder plate on which an optical reading scale pattern is formed and an optical reading detector is used to measure the X and Y of a universal parallel ruler. Converts the movement amount of moving objects such as cursor and ruler mounting plate from A to D,
Based on the incremental digital pulse count position output or the absolute digital pulse position output of this encoder, the amount of movement of the moving body is digitally displayed on the display.
This conventional example is disclosed in Japanese Patent Publication No. 58-55916.

[Problem that the invention seeks to solve]

In this type of universal parallel ruler, if the amount of movement of the moving body is to be displayed with high precision, the slit scale pattern of the encoder plate may be formed with high precision. However, in order to form slit scales on the encoder plate with high precision, a hard and expensive substrate must be used. In addition, since universal parallel rulers are exported and sold to countries and regions around the world with different environments such as temperature and humidity, if a cheap material is used for the encoder plate, the encoder plate will change depending on the temperature of the place where it is used.
It expands and contracts due to humidity, and as a result, an error occurs in the accuracy of displaying the amount of movement of the moving object, making it impossible to display the amount of movement of the moving object with high accuracy using an inexpensive encoder.

An object of the present invention is to provide an inexpensive and highly accurate display device that eliminates the above-mentioned defects.

[Means for solving problems]

The present invention comprises a head that is supported so as to be movable in parallel with the movement of a movable body in any direction with respect to the drawing surface, and a movable body for attaching a scale that is rotatably connected to a base plate of the head. In a device consisting of
An encoder converts the amount of movement of at least one of the moving bodies into a digital signal, and a position signal based on the output digital signal of the encoder is used as an address signal to receive precise measurement data of the at least one moving body. The address position signal of the at least one moving body is stored in advance in a writable and readable storage means, and when the address position signal of the at least one moving body is input, the address position signal of the at least one moving body is stored based on the precision measurement data corresponding to the address position signal. It is characterized by comprising a microcomputer that outputs a digital signal indicating the exact amount of movement of the moving object, and a display that displays the output signal of the microcomputer.

〔Example〕

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 3, reference numeral 2 denotes a drawing board, to which an X rail 4 is fixed, and an X cursor 6 (moving body) is movably attached to the X rail 4. The movement of the X cursor 6 along the X rail 4 is controlled by a known rotary X encoder 8 (see FIG. 1) equipped with a disc-shaped slit plate and an optical detector, with a phase difference of 90 degrees. is configured to be converted into a pair of continuous pulse signals having . 10 is a Y rail connected to the X cursor 6;
The rail 10 is set perpendicular to the X rail 4, and the Y rail 10 is supported on the drawing board 2 so as to be movable along the X rail 4. 12 is a Y cursor (moving body) movably attached to the Y rail 10, and a head 14 is attached to this. Y rail 1 of the Y cursor 12
0 is configured to be converted by a known rotary Y encoder 16 into a pair of continuous pulse signals having a phase difference of 90 degrees.
A scale mounting plate 18 (movable body) is rotatably mounted on the head 14 to the base plate of the head 14, and scales 20 and 22 are removably fixed to the scale mounting plate 18. The rotational movement of the scale mounting plate 18 relative to the head 14 substrate is converted by a known rotary encoder 24 into a pair of continuous pulse signals with a 90 degree phase difference and directionality. It is configured. As the X, Y encoders 8, 16,
A linear encoder consisting of a long slit plate disposed along the rails 4, 10 and an optical photodetector disposed on the cursor 6, 12 side can be used. The output end of the X encoder 8 is connected to an X counter 32 via a Schmitt circuit 26, a direction determining circuit 28, and a polarity inverting circuit 30, as shown in FIG. When the X cursor 6 is moved to the right in FIG. 1 along the X rail 4, the X encoder 8 outputs a pair of continuous pulses with a phase shift of 90 degrees. This pulse is waveform-shaped by the Schmitt circuit 26 and input to the direction determining circuit 28. The direction determining circuit 28 determines the direction of the pulses based on the phase difference between the output pulses of the encoder 8, and outputs the output pulses to the X counter 32 via the polarity reversing circuit 30.
A pulse is output to the up count line of , and the X counter 32 adds up the pulse. X cursor 6
3 along the X rail 4, the direction determining circuit 28 determines the direction of the pulses from the X encoder 8, and outputs the pulses to the down count line of the X counter 32. This causes the X counter 32 to subtract the pulse. Based on the same principle as above, the Y counter 50 controls the Y cursor 12.
When the Y cursor 12 rises along the Y rail 10 in FIG. 3, the output pulses of the Y encoder 16 are added, and when the Y cursor 12 descends, the output pulses of the Y encoder 16 are subtracted. Furthermore, the encoder 24
The output terminal of is connected to the Schmitt circuit 9 as shown in FIG.
0, is connected to the counter 52 via a direction discrimination circuit 92 and a polarity inversion circuit 94. Reference numeral 96 denotes a zero detecting section for detecting the zero count value of the counter 52 and inverting the flip-flop circuit of the polarity inverting circuit 94. When the ruler mounting plate 18 (moving body) is rotated in the direction of the hour hand in FIG.
Encoder 24 outputs a pair of continuous pulses that are 90 degrees out of phase. This pulse is generated by Schmitt circuit 9
The waveform is shaped by 0 and input to the direction determining circuit 92. The direction determination circuit 92 is the encoder 24
The direction of the pulse is determined based on the phase difference between the output pulses, and the pulse is outputted to the up count line of the counter 52 via the polarity inversion circuit 94. Counter 52 adds up the pulses. The polarity detection circuit 97 attaches a "-" polarity flag to this added value. When the ruler mounting plate 18 is moved relative to the board 39 of the head 14 in the direction of the hour hand in FIG.
The direction of the pulse is determined and the pulse is output to the down count line of the counter 52. This causes counter 52 to subtract the pulse. The ruler mounting plate 18 rotates in the direction of the hour hand in FIG.
When the clock rotates in the direction of the hour hand, the polarity inversion circuit 94 is inverted by the zero detection section 96, and the direction discrimination circuit 92 is inverted.
The input path of the output pulse to the counter 52 is switched. That is, when the ruler mounting plate 18 rotates in the direction of the hour hand in a state where the ruler mounting plate 18 is positioned in the direction of the hour hand in FIG. When the ruler mounting plate 18 rotates in the counterclockwise direction, the counter 52 subtracts the pulse. Incidentally, the count value of the counter 52 at this time is given a polarity of "-". in the end,
The counter 52 counts the absolute amount of movement of the ruler mounting plate 18 relative to the head board 39 with reference to the zero origin position, with polarity attached. The zero origin positions of the X cursor 6, Y cursor 12, and ruler mounting plate 18 are determined by the X, Y, and origin designation switches 4.
Turn this on by pressing 0, 88, 62, then press X,
Y, can be set by operating the reset circuits 41, 89, 63 and resetting the counters 32, 50, 52. Normally, the zero origin of X cursor 6 is
The zero origin of the Y cursor 12 is set at the left end of the Y cursor until it is stopped by the stopper.
The cursor 12 is moved to the lowest end of the Y rail in FIG. 3 until it is stopped by a stopper. The zero origin of the ruler mounting plate 18 is
As shown in FIG. 3, the horizontal straightedge 20 is
Set when parallel to . Said X
The encoder 8 is disposed at the end of the X rail 4, the Y encoder 16 is disposed at the end of the Y rail 10, and the encoder 24 is disposed inside the head 14. Said X, Y, counter 32, 5
0, 52 are placed inside the respective casings of the encoders 8, 16, 24, and the counter 3
2, 50, 52 are latches 70, 72, 7 respectively
4 to an input/output interface 76 of a microcomputer 75. Input/output interface 7 of the microcomputer 75
6, CPU78, EP-ROM100, RAM10
2. The decoder 104 is integrated into a circuit mounting plate inside the cover attached to the head 14. 48 is a group of preset input keys for X, Y, , 58 is a CPU reset switch, 59 is a CPU
Reset circuit, 60 is XY attached to head 14
It is a value display and is connected to the input/output interface 76 via the driver 61. The key group 48 and switches 58, 40, 88, 62 are mounted on the head 14. In this embodiment, commercially available incremental encoder plates are used for the X encoder 8, Y encoder 16, and encoder 24, but as shown in FIG. 6, commercially available absolute type encoder plates may be used.

As is clear from the above description, the X encoder 8, the Schmitt circuit 26, the direction determination circuit 28,
Polarity inversion circuit 30, X origin designation switch 40,
The reset circuit 41 and the X counter 32 constitute an X movement data generating means, which includes the Y encoder 16, the Schmitt circuit 80, the direction discrimination circuit 82, the polarity inversion circuit 84, the Y origin designation switch 88, the Y reset circuit 89, and the Y counter 50. constitutes a Y movement data generation means, and the encoder 24, Schmitt circuit 90, direction discrimination circuit 92, polarity inversion circuit 94, zero detection section 96, origin designation switch 62, reset circuit 63, polarity detection circuit 97 and counter 52. It constitutes an angle data generating means. When the encoders 8, 16, 24 using the absolute encoder plate 110 are used, the encoder 8 and the code conversion circuit 112 constitute an X movement data generating means, as shown in FIG.
6 and the code conversion circuit 114 can constitute a Y movement data generation means, and the encoder 24 and the code conversion circuit 116 can constitute a data generation means.

Next, the operation of writing precision measurement data to the EP-ROM 100 will be explained with reference to FIG.

First, the output end of the X movement data generating means, that is, the
The output end of the counter 32 is connected to the input end A of a microcomputer 120 prepared separately, and the output end of the laser precision measuring device 122 for length measurement is connected to the input end B of the microcomputer 120. In addition, the microcomputer 120 is
It is connected to the ROM writer 128, and the writer 128 is connected to the EP-ROM through the connector of the microcomputer 75 in the head 14.
It is connected to a ROM, that is, a writable and readable storage means 100. Further, a laser reflector 124 is attached to the Y rail 10, and a laser oscillator 126 is set at a predetermined position. Next, move the X cursor 6 to the left end stopper position of the X rail 4 in FIG.
Press to reset the X counter 32 to zero. Also, the counter of the precision measuring instrument 122 is reset to zero. Next, the Y rail 10 is moved to the right in FIG. 4 by manual operation. X at this time
The count value A of the counter 32 is input to the microcomputer 120. On the other hand, the amount of movement of the X cursor 6 is converted into precise pulse count data B by a laser precision measuring device 122, and this pulse count data B is converted to precise pulse count data B by a microcomputer 120.
is input to the input terminal B of the arithmetic circuit. The microcomputer 120 divides the total movement length of the X cursor 6 into arbitrary pitches, and divides the X counter 32 for each pitch based on the count value of the X counter 32.
Calculate the measurement value error (A-B). That is, the count data A at the position where the X cursor 6 has moved 1 mm to the right based on the count value of the X counter 32 is calculated such that the error is E1 with respect to the count data B, and the error at the position 2 mm is E2. The data En is input to the EP-ROM writer 128 for each address signal and together with the count data A as an address signal, and the EP-ROM writer 128 reads the address Signal A and its corresponding deviation value
Write En to EP-ROM100. Similarly, by attaching the laser reflector 124 to the Y cursor 12, the movement amount deviation En of the Y cursor in FIG. Then, the count value of the Y counter 50 is written into the EP-ROM 100 as an address signal. EP-
When writing to the ROM 100, as shown in FIG.
a (see Fig. 3) and attach the high-precision measuring instrument 13 for angle measurement to the board 39 (non-rotating part) of the head 14.
At the same time, the rotation input shaft 132 of the measuring instrument 130 is connected to the main shaft 42 via the connector 134. Next, the ruler mounting plate 18 is rotated until an index pawl (not shown) of a known indexing mechanism fits into an index recess (not shown) at the zero degree position of an index ring (not shown). At this time, the horizontal straightedge 20 becomes parallel to the X rail 4, as shown in FIG. In this state,
Press the origin designation switch 62 and set the counter 5.
2 to zero. In addition, high precision measuring instrument 1
Reset the 30 counter to zero. next,
The ruler mounting plate 18 is manually rotated in the counterclockwise direction in FIG. 3. The count value A of the counter 52 at this time is given a positive polarity by the polarity detection circuit 97 and inputted to the microcomputer 120. On the other hand, the amount of rotation of the ruler mounting plate 18 is converted by a high-precision measuring device 130 into precise pulse count data B having polarity, and this pulse count data B is input to the input terminal B of the arithmetic circuit of the microcomputer 120. be done. The microcomputer 120 divides the entire rotation range of the ruler mounting plate 18 into arbitrary pitches, and calculates the measurement value error (A-B) of the counter 52 for each pitch based on the count value of the counter 52. That is, as shown in FIG. 7, the deviation value En of the count data A from the count data B at the position where the ruler mounting plate 18 has rotated +0.01 degrees counterclockwise in the counter 52 count value is -0.02 degrees. , the deviation value En at the +0.02 degree position is -0.02 degree, as shown in FIG.
Each address signal is input to the EP-ROM writer 128 together with the address signal, and the EP-ROM writer 128 writes:
The above address signal A and the corresponding deviation value En
is written to the EP-ROM100. Further, when the ruler mounting plate 18 is rotated in the direction of the hour hand with respect to the zero origin, a "-" polarity is added to the address output A of the counter 52 and the output B of the measuring device 130.
When the writing to the EP-ROM 100 is completed, the precision measuring instruments 122 and 130 are removed from the flexible parallel ruler, and the microcomputer 120 is removed.
Then, the EP-ROM writer 128 is removed from the counters 32, 50, 52 and the microcomputer 75 in the head 14, respectively.

[Effect]

Next, the operation of this embodiment will be explained.

First, a power switch (not shown) is turned on. As a result, the CPU reset circuit 59 operates and the CPU 78 in the microcomputer 75 is reset. Next, X, Y cursor 6, 1
2 and the ruler mounting plate 18 to the predetermined zero position, and turn the switches 40, 88, 62
Press to reset counters 32, 50, and 52 to zero. After that, when the head 14 is moved to an arbitrary position along the drawing board 2 or the ruler mounting plate 18 is rotated, the X, Y,
Encoders 8, 16, and 52 drive, and X, Y,
From the outputs of the counters 32, 50, 52, the X, Y, digital position signals are provided as address signals AX, AY, A to a microcomputer 75 via latches 70, 72, 74.
The CPU 78 uses the above address signals AX, AY, A.
The deviation data En specified by
Call from 100, address signals AX, AY,
Based on A and the deviation data En, calculate AX-En-RX=TX AY-En-RY=TY A-En-R=T. The above RX, RY, and R are values for zero setting set by the preset value input key group 48, and by setting these values appropriately,
The value displayed on the Y value display 60 can be set to zero at any point. Above TX, TY, T
That is, precise digital correction data is displayed on the display 6.
Displayed digitally as a decimal number at 0. still,
In the above embodiment, in addition to the address signal, the deviation value is
En is written into the EP-ROM 100, but instead of the deviation value En, the precise measurement data B itself is written to the EP-ROM 100 along with the address signal
It may also be written to ROM100. In this case, when address signal A is input to the microcomputer 75, X,
Precise measurement data B for Y and direction is EP-ROM78
From this data B, the CPU 76
The value obtained by subtracting the above preset values RX, RY, and R is output.

〔effect〕

As described above, the present invention provides precision precision in which the amount of movement of a moving body such as the X and Y cursors of a universal parallel ruler or a ruler mounting plate is stored in advance in a readable storage means using the output of an encoder as an address signal. Since the display is based on the precision measurement data of the measuring instrument, the amount of movement of the moving body can be displayed with the precision of the precision measuring instrument using an inexpensive encoder. In addition, if you write to the above-mentioned storage means while using the flexible parallel ruler, you can eliminate the problem of encoder output error caused by expansion and contraction of the encoder plate that occurs when temperature and humidity change significantly, and achieve high accuracy. This has the advantage of being able to display the amount of movement of a moving object.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention; FIG. 1 is a block circuit diagram, FIG. 2 is a block circuit diagram showing another embodiment, FIG. 3 is a plan view, FIG. 4 is an explanatory diagram, and FIG. 6 is a plan view of the absolute encoder plate, FIG. 7 is an explanatory view, and FIG. 8 is an explanatory view showing another embodiment. 2...Drawing board, 4...X rail, 6...X cursor, 8
...X encoder, 10...Y rail, 12...Y cursor, 14...head, 16...Y encoder, 18
...Ruler mounting plate, 20...Horizontal straight ruler, 22...Vertical straight ruler, 120...Microcomputer, 122...
Precision measuring instrument, 126... Laser oscillator, 128...
EP-ROM writer, 130...Precision measuring instrument, 1
10...Absolute encoder board.

Claims (1)

[Scope of Claims] 1. A head supported so as to be movable in parallel with the movement of a movable body in any direction relative to the drawing surface, and a movable member for attaching a scale rotatably connected to a base plate of the head. an encoder for converting the amount of movement of at least one of the moving bodies into a digital signal; and a position signal based on the output digital signal of the encoder as an address signal for the at least one of the moving bodies. Precise measurement data of a moving object is stored in advance in a readable and writable storage means, and when an address position signal of the at least one moving object is input, the precision measurement data corresponding to the address position signal is A display device for a universal parallel ruler, comprising a microcomputer that outputs a digital signal indicating an accurate amount of movement of the at least one movable body, and a display that displays the output signal of the microcomputer. 2. The display device for a universal parallel ruler according to item 1, wherein the encoder is an encoder that converts the amount of rotational movement of the scale mounting movable body relative to the head substrate into a digital signal. 3. The display device for a universal parallel ruler according to claim 1, wherein the encoder is an X, Y encoder that converts the amount of movement of the moving body that guides the head in the XY coordinate axis direction into a digital signal. 4. The precision measurement data stored in the write-readable storage means is composed of a deviation value between the value of the address position signal and the measurement value of the precision measuring instrument, and is sent to the microcomputer as the output of the encoder. When a base address position signal is input, the microcomputer corrects the input address position signal based on the input address position signal and the corresponding deviation value to determine the accuracy of the at least one mobile object. 2. The display device for a universal parallel ruler according to claim 1, wherein a corrected digital signal indicating a moving amount is generated and the corrected digital signal is displayed on a display. 5 The precision measurement data stored in the write-readable storage means is constituted by the measurement values of the precision measuring instrument, and when the address position signal based on the output of the encoder is input to the microcomputer, the precision measurement data is 2. The computer according to claim 1, wherein the computer calls up a measured value of the precision measuring device corresponding to the address position signal, outputs it, and displays the measured value on a display. Ruler display device.