JPS594752B2 - coordinate reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coordinate reader having a function of moving a reading head backward from an arbitrary position to the coordinate point just read.

Conventional devices of this kind drive XY pulses or a servo motor by manual switch operation, move the reading head along the XY coordinate plane on the mounting table, and move the reading head to the desired coordinates of the drawing positioned on the mounting table. Read the point 5 The hole T provided on the pickup head
A V-camera images the index on the cathode ray tube along with an index provided in front of the lens of the ITV camera, and the reading head is stopped when the index projected on the cathode ray tube coincides with the coordinate point.

The amount of movement of the reading head relative to the origin of the X-Y coordinates at this time is measured by a counter, and this measured value is
The signal is supplied to the output device by turning on the record switch. The above is the principle of the coordinate reader, but as shown in Figure 3, when measuring the coordinate values of arbitrary points on many lines that are close to each other, it becomes difficult to know which point has been read and measured. This was extremely inconvenient. The present invention is provided with a vector reverse switch, and when this switch is pressed, the reading head automatically moves to the coordinate point that was read just before, and the purpose is to remove the above-mentioned 20 defects. . DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings. Reference numeral 2 denotes a reading head, on which a TV camera 4 is mounted, and the image of the drawing on the mounting table 256 is captured by the ITV camera 4. An index 8 placed in front of the lens of the TV camera 4
It is also configured to be displayed on the screen of the monitor television receiver 10.

Note that the indicator 8 is a cross drawn with a black line on a transparent plate.
The operation console 12 is provided with a switch group 14 consisting of a +X switch 30 for continuous feeding, a -X switch, a +Y switch, and a -Y switch, a transport dial X switch 16, and a transport dial Y switch 18. . When the +X switch is pressed, a high-speed positive direction pulse is supplied to the X pulse motor x, and the Y rail 20 and X rail 22,
22 in the direction of the +X coordinate axis at high speed. When the -X switch is pressed, the Y rail 20 moves at high speed in the direction of the -X coordinate axis. When the +Y switch is pressed, the high-speed pulse
The reading head 2 is supplied to the pulse motor and the Y rail 20
When the -Y switch is pressed, the reading head 2 moves at high speed along the Y rail 20 in the direction of the -Y coordinate axis. When the X switch 16 is rotated to the right, a low speed positive direction pulse is supplied to the X pulse motor, and the Y rail 20 moves at low speed in the direction of the +X coordinate axis, and when it is rotated to the left, the Y rail 20 moves in the direction of the -Y coordinate axis. move at low speed. Similarly, when the Y switch 18 is turned to the right, the reading head 2 slowly moves along the Y race 20 in the +Y coordinate axis direction, and when turned to the left, the reading head 2 slowly moves along the Y rail 20 - Move in the direction of the Y coordinate axis. 28 is a record switch, and 24 is a vector reverse switch. When these are pressed, the reading head 2 moves from an arbitrary position to the coordinate point read just before, and the center of the index 8 coincides with the coordinate point.

This previous coordinate point automatic return device will be explained with reference to FIG. 26 is a coordinate value latch circuit, and a record switch 28 is connected to a load terminal 26a.

The input part of the latch circuit 26 is a main counter 30 that counts the amount of movement of the reading head 2 in the X-Y coordinate axis direction.
Connected to the output end of the 32 is a subtraction circuit, one input of which is connected to the output of the latch circuit 26, and the other input of which is connected to the output of the main counter 30.

39 is DDA (motor 1 drive path), and line 3
When a signal of "1" is input from 47, the frequency of the output pulse decreases and then the pulse stops.

34 is an inverting amplifier, and these are connected as shown.

Next, the operation of this embodiment will be explained. Move the reading head 2 to the point to be read on the drawing on the mounting table 6, and
When the center of the main counter is aligned with said point and the record switch 28 is pressed, the contents of the main counter are fed to an output device and punched into a recording medium, such as an input tape.

Furthermore, line 3 is set by the record switch 280N.
A code signal from 6 is input to the coordinate value latch circuit 26,
As a result, the contents of the main counter 30 are stored in the circuit 26. Next, if you move the reading head 2 in the direction of the next reading point and you no longer know which point was read previously, turn the vector reverse switch 2 on.
Press 4. from line 38 by switch 240N''
An arithmetic start signal of 12゛ is input to the subtraction circuit 31, and the circuit 31 subtracts (A-B) the content B of the main counter 30 from the memory data A of the latch circuit 26, and calculates the result of this subtraction as the amount of backward movement. is output to the DDA 32, and an operation completion signal is sent from the line 34 to the DDA 39.
supply to. A DDA (pulse interpolator) 39 supplies pulses to the XY motor of the servo mechanism based on the backward movement amount data. As a result, the reading head 2 moves to the point read just before, and the center of the index 8 coincides with that point. If the lost line is found while the reading head 2 is moving backward, release the vector reverse switch 24 and set the switch 24 to 0FF.
A deceleration stop command of "1" is issued to 39, and the backward movement of the reading head 2 is decelerated and immediately stopped by this command.Although a pulse motor is used in this embodiment,
A method using a servo motor may also be used. Further, the mounting table 6 may be moved relative to the Y rail 20 in the direction of the X coordinate axis. Since the present invention is constructed as described above, if the coordinate reading operator loses the reading line, the reading head can be moved to the immediately previous record point.
This has the advantage that the coordinate point reading work can be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is an overall external view, FIG. 2 is an external view of the operation console, FIG. 3 is an explanatory view, and FIG. 4 is an explanatory view of the electronic circuit block. 2...Reading head, 6...Placement stand, 8
...Indicator, 16,18...XY switch, 20...Y rail, 22...X rail, 24...Vector reverse switch ,2
6... Coordinate value latch circuit, 28... Record switch, 30... Main counter, 3
1... Subtraction circuit, 32... DDA (motor drive circuit).

Claims (1)

[Claims] 1 A mounting table 6, a reading head 2 provided with an index, and a servo that drives the reading head 2 in a predetermined direction relative to the mounting table 6 in a plane parallel to the mounting table 6 by the output of a motor drive circuit 39. a main counter 30 that counts the amount of relative movement of the reading head 2 with respect to the mounting table 6 along the X-Y coordinate axis direction, and a coordinate value latch circuit 26 that stores the coordinate value of the previous reading point of the reading head 2. Then, in response to a command from the vector reverse switch 24, the coordinate value of the current position of the reading head 2 is subtracted from the coordinate value of the previous reading point, and this subtracted value is output to the motor drive circuit 39 as backward movement data of the reading head. A coordinate reader comprising a circuit 32 for moving the reading head 2 backward to a previous reading point by the output of the motor drive circuit 39.