JPH0210971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an NC machining device that can easily cut handwritten characters and figures onto the surface of a workpiece.

(Prior art and problems) Among conventional NC (numerical control) machining devices, devices that cut arbitrary characters or figures on the surface of a workpiece have the ability to cut arbitrary characters or figures on the surface of a workpiece. It is relatively easy to select and execute the operation, but if you want to cut other characters or shapes, such as handwritten characters or handwritten figures, you can break down the handwritten characters or handwritten figures into straight lines or arcs, and then cut them. Since the coordinate values of the start point and end point, radius, etc. had to be entered into the program from the keyboard, only an experienced person could handle it.
Further, there are disadvantages such as it takes time even for an experienced person, has low productivity, and is expensive.

(Object of the Invention) In order to eliminate the above-mentioned conventional drawbacks, the present invention includes a tablet for inputting coordinates and a flat display superimposed on the tablet, and allows characters and figures input from the tablet to be displayed on the display. It is designed to both display and cut into the workpiece, and its purpose is to provide an NC machining device that can easily cut handwritten characters and figures onto the surface of the workpiece. The drawings will be described in detail below.

(Embodiment) FIG. 1 is a perspective view showing an outline of an embodiment of the present invention. In the figure, 100 is a tablet for inputting coordinates, 200 is a position specifying magnetic generator (hereinafter simply referred to as a magnetic pen) for specifying coordinates, and 300 is a planar pen superimposed on the tablet 100. Display, 400 is magnetic pen 2
00 is a position detection circuit that detects the specified coordinate value on the tablet 100, and 500 is the display 20.
0, a display control circuit that drives 600, a processing device;
700 is RS232C interface unit, 80
0 is an NC machining device main body, such as an NC (numerically controlled) drilling machine, and 900 is a workpiece, such as a metal plate.

FIG. 2 is a plan view showing the structure of the tablet 100, and FIG. 3 is a sectional view taken along line A-A' in FIG. In the figure, reference numeral 101 indicates a magnetostrictive transmission medium in the X direction, and reference numeral 102 indicates a magnetostrictive transmission medium in the Y direction, and a plurality of them are arranged substantially parallel to each other. Although any ferromagnetic material can be used for the magnetostrictive transmission media 101 and 102, a material with a large magnetostrictive effect, such as an amorphous alloy containing a large amount of iron, is particularly desirable in order to generate strong magnetostrictive vibration waves. Further, it is preferable to use a material with a small coercive force that is difficult to magnetize even when a magnet is brought close to the material.
Examples of amorphous amorphous alloys include
Fe ₆₇ CO ₁₈ B ₁₄ Si ₁ (atomic %), Fe ₈₁ B _13.5 Si _3.5 C ₂ (atomic %), etc. can be used. Magnetostrictive transmission medium 101, 10
2 has an elongated shape, and its cross section is preferably a rectangular thin strip or a circular linear shape, and in the case of a thin strip, the width is about several mm and the thickness is about several μm to several tens of μm, which is easy to manufacture and has characteristics. is also good. Amorphous alloys can be manufactured into thin pieces with a thickness of 20 to 50 μm, so they can be cut into thin plates or lines. In this example, a magnetostrictive transmission medium made of Fe ₈₁ B _13.5 Si _3.5 C ₂ (atomic %) and having a width of 2 mm and a thickness of 0.02 mm is used.

Reference numerals 103 and 104 are elongated cylindrical reinforcing materials made of synthetic resin or the like, which are used for the magnetostrictive transmission media 101 and 10
2 are housed inside each.

105 is a reinforcing material 1 at one end of the magnetostrictive transmission medium 101
03, the first electromagnetic transducer in the X direction, for example, the first coil in the X direction. This X-direction first coil 105 is twisted between adjacent reinforcing members 103,
Each adjacent magnetostrictive transmission medium 101 is wound in the opposite direction, and when a current is passed through the coil 105, a magnetic flux is generated from a portion corresponding to each magnetostrictive transmission medium 101, or a magnetic flux in one direction is applied to the coil 105. The voltages generated in the respective parts when the voltage is applied are in opposite directions. Therefore, pulse noise and external induction generated when a pulse current is passed through the coil 105 are canceled out and weakened between adjacent portions of the coil 105. Note that although the number of turns is one in the illustrated example, it may be wound two or more times. This X-direction first coil 105 is for generating instantaneous magnetic field fluctuations to generate magnetostrictive oscillation waves in each winding portion of the magnetostrictive transmission medium 101, and one end of the coil 105 is connected to a position detection circuit to be described later. 40
0, and the other end is grounded.

Further, 106 is a Y-direction first electromagnetic transducer, for example, a Y-direction first coil, which is disposed on the reinforcing material 104 at one end of the magnetostrictive transmission medium 102, and is twisted between the adjacent reinforcing materials 104, and the adjacent magnetostrictive Each transmission medium 102 is wound in the opposite direction. One end of this Y-direction first coil 106 is connected to a pulse current generator like the coil 105, and the other end is grounded. Note that the action is similar to that of the coil 105.

107 and 108 are reference position designating magnetic generators;
For example, a square magnet is used to apply a bias magnetic field parallel to the longitudinal direction to the wound portion of the first coil 105 in the X direction of the magnetostrictive transmission medium 101 and the wound portion of the first coil 106 in the Y direction of the magnetostrictive transmission medium 102, respectively. belongs to. The reason for applying the bias magnetic field in this manner is to enable the generation of large magnetostrictive vibration waves with a small amount of current, and to specify the generation position of the magnetostrictive vibration waves. That is, the magnetostrictive transmission medium 10
Electromechanical coupling coefficient of 1,102 (coefficient indicating conversion efficiency from mechanical energy to electrical energy or from electrical energy to mechanical energy)
For example, as shown in FIG. 4, the maximum value is reached at a certain bias magnetic field, so by applying such a magnetic bias to the wound portions of the first coil 105 in the X direction and the first coil 106 in the Y direction, Magnetostrictive vibration waves can be generated efficiently.

Reference numeral 109 denotes a second electromagnetic transducer in the X direction, such as a coil, which is disposed on the reinforcing member 103 over almost the entire length of the magnetostrictive transmission medium 101 except for the one end. The coils 109 are all wound in the same direction (left-handed in this embodiment) on each magnetostrictive transmission medium 101, and are connected in series such that adjacent coils have opposite polarities. Therefore, when magnetic flux in one direction is applied to all coils 109, each coil 1
09 voltage, current direction, or coil 1
When a current is passed through the entire coil 109, the direction of the magnetic flux generated in each coil 109 is opposite between adjacent coils, and external induction and noise are canceled out and weakened between the adjacent coils.

The winding pitch of the coil 109 is gradually more densely wound from one end on the side close to the first coil 105 in the X direction toward the other end on the opposite side, and the induced voltage is small due to the attenuation of the magnetostrictive vibration waves. I'm making up for it. Generally, in order to increase the induced electromotive force, it is preferable to have a larger winding pitch. This X direction second
The coil 109 is for detecting the induced voltage due to the magnetostrictive vibration waves propagating through the magnetostrictive transmission medium 101, and one end is connected to the pulse detector of the position detection circuit 400, and the other end is grounded and wound. The area becomes the position detection area.

Further, 110 is a Y-direction second electromagnetic transducer, for example a coil, disposed on the reinforcing member 104 over a wide range of the magnetostrictive transmission medium 102;
10 are all wound in the same direction (left-handed in this embodiment) on each magnetostrictive transmission medium 102, and are connected in series such that adjacent coils have opposite polarities. Further, the winding pitch of this coil 110 is gradually denser from one end on the side close to the first coil 104 in the Y direction toward the other end on the opposite side, and one end is connected to the position detection circuit 404.
is connected to the pulse detector, and the other end is grounded. Note that the action is similar to that of the coil 109.

The X-direction position detection unit, which is composed of the X-direction magnetostrictive transmission medium 101, the reinforcing material 103, the X-direction first coil 105, and the X-direction second coil 109, is a recess provided in the inner bottom surface of the non-magnetic metal case 111. The magnetostrictive transmission medium 102 and the reinforcing material 10
4, a first Y-direction coil 106, and a second Y-direction coil 110, the Y-direction position detecting section is superimposed orthogonally on the X-direction position detecting section, and is fixed with adhesive or the like as necessary. be done. Also,
The reference position specifying square magnets 105 and 106 are fixed to the inner bottom surface of the metal case 111 so as to face the ends of the magnetostrictive transmission media 101 and 102, but are located above, below, and to the sides of the magnetostrictive transmission media 101 and 102. They may be arranged in parallel. The top of the metal case 111 is covered with a lid 112 made of non-magnetic metal.

FIG. 5 is a sectional view showing the structure of the magnetic pen 200. In the figure, 201 is a cylindrical bar magnet, which is attached to the tip of a pen-shaped container 202 with its north pole facing down. Further, 203 is a signal generator that generates a predetermined signal indicating the start of measurement, and is activated by turning on the operation switch 204.
The ultrasonic transmitter 205 sends a signal indicating the start of measurement.
The ultrasonic signal is converted into an ultrasonic signal and sent to a receiver in the position detection circuit 400, which will be described later.

As the display 300, for example, a well-known matrix type liquid crystal display panel in which a liquid crystal medium is interposed between a plurality of crossed horizontal and vertical electrodes is used. Further, the display area of the display 300 is approximately equal to the inputtable range of the tablet 100, and the display areas are stacked vertically so that the coordinate positions thereof coincide with the coordinate positions of the tablet 100.

The NC drilling machine 800 has a metal plate 90 mounted on a table that can be moved to any position using a pulse motor or the like.
0 is fixed, a high-speed rotating drill is applied to the surface, and the table is moved to perform drilling and cutting.
50 (made by Seiro, Machinery, Japan) NC drilling machine is used.

FIG. 6 is a circuit block diagram showing the main parts of the device. Hereinafter, the operation of the apparatus of the present invention will be described in detail together with a description of the circuit blocks described above.

Now, a metal plate 900 is fixed on the table of the NC drilling machine 800, and the magnetic pen 200 is displayed at a distance l 1 in the X-axis direction from the center of the coil surface of the first coil 105 in the X direction of the tablet 100 via the display ₃₀₀ . It is located on the magnetostrictive transmission medium 101 and further on the magnetostrictive transmission medium 102 at a distance l ₂ in the Y-axis direction from the center of the coil surface of the first coil 106 in the Y direction. 102.

In this state, when the operating switch 204 of the magnetic pen 200 is turned on, the transmitter 205 transmits an ultrasonic signal indicating the start of measurement. The ultrasonic signal is received by a receiver 401 and converted into an electrical signal, amplified and waveform-shaped by a receiver 402, and sent to an input buffer 403. The control circuit 404 reads the measurement start signal from the input buffer 403, recognizes the start of measurement, resets the counter 406 via the output buffer 405, and operates the X-direction pulse current generator 407. Counter 406 receives clock pulses from clock generator 408 (pulse repetition frequency is, for example,
100MHz).

When the X-direction pulse current generator 407 operates and a pulse current is applied to the X-direction first coil 105, an instantaneous magnetic field fluctuation occurs in the X-direction first coil 105, which causes the A magnetostrictive vibration wave is generated in the winding portion of the first coil 105. This magnetostrictive vibration wave is transmitted to the magnetostrictive transmission medium 101 at a propagation speed (approximately 5000 m/sec) specific to the magnetostrictive transmission medium 101.
01 is propagated along the longitudinal direction. During this propagation, mechanical energy is converted into magnetic energy at a portion of the magnetostrictive transmission medium 101 where the magnetostrictive vibration wave exists, depending on the magnitude of the electromechanical coupling coefficient at that portion, so that Direction 2nd
An induced electromotive force is generated in the coil 109.

FIG. 7 illustrates an example of a temporal change in the induced electromotive force generated in the second coil 109 in the X direction, with the time when a pulse current is applied to the first coil 105 in the X direction being t=O. As shown in the figure, the amplitude of the induced electromotive force changes immediately after time t=O and from time t ₀ to t ₁ ~
It becomes larger after t ₂ seconds and becomes smaller at other times. Immediately after time t=O, the amplitude of the induced electromotive force becomes large because the first coil 105 in the X direction and the
This is due to the electromagnetic induction effect between the second coils 109 in the X direction, and the reason why the amplitude of one cycle of induced electromotive force (induced voltage due to magnetostrictive vibration waves) increases at time t=t ₁ to _{t 2} is due to the electromagnetic induction effect between the second coils 109 in the X direction. The magnetostrictive vibration waves generated in the winding portion of the coil 105 are transmitted to the magnetostrictive transmission medium 1.
01 and reached the vicinity directly below the magnetic pen 200, where the electromechanical coupling coefficient became large. When the magnetic pen 200 is moved along the longitudinal direction X of the magnetostrictive transmission medium, the voltage induced by the magnetostrictive vibration waves also moves on the time axis accordingly.
Therefore, by measuring the time from time t ₀ to t ₁ to _{t 2} , it is possible to calculate the position in the X direction specified by the magnetic pen 200, that is, the distance l ₁ . As the propagation time for calculating the position, for example, as shown in Fig. 7, the time t ₃ when the amplitude of the induced voltage due to magnetostrictive vibration becomes smaller than the threshold value -E ₁ and the time t ₄ when it becomes larger than the threshold value E ₁ are used. Alternatively, the zero cross point _t5 may be used.

The induced electromotive force generated in the X-direction second coil 109 described above is input to the X-direction pulse detector 409. The X-direction pulse detector 409 is composed of an amplifier, a comparator, etc., and its output is detected while the induced electromotive force is greater than the threshold value _E1 mentioned above, that is, when the positive polarity portion of the induced voltage due to the magnetostrictive oscillation wave is detected. is considered a high level. When the control circuit 404 reads this high level signal through the input buffer 403, it outputs a stop signal to the counter 406 through the output buffer 405 to stop counting. At this time, the counter 406 obtains a digital value corresponding to the time from the time when the pulse current is applied to the first coil 105 in the X direction until the induced voltage due to the magnetostrictive vibration wave appears in the second coil 109 in the X direction. Also, this value means that the magnetostrictive vibration waves are approximately
By moving at a speed of 5000 m, the distance in the X direction from the first coil 105 in the X direction to the magnetic pen 200
It corresponds to l ₁ . The X-direction coordinate value thus obtained as a digital value by the counter 406 is sent to the control circuit 4 via the input buffer 403.
04, and further sent to the processing device 600 where it is temporarily stored.

Next, the control circuit 404 resets the counter 406 again, operates the X-direction pulse current generator 410, monitors the output of the Y-direction pulse detector 411, and determines the Y-direction coordinate value of the magnetic pen 200 in the same manner as described above. and sends it to the processing device 600.
Thereafter, by repeating this process, it is possible to obtain position data that is instructed one after another.

On the other hand, position data consisting of coordinate values in the X and Y directions stored in the processing device 600 is sent to the display memory 501 of the display control circuit 500, where it is arranged and stored in a certain order and is The signals are sequentially read out by timing pulses from the circuit 502 and sent to the X direction driver 503, Y
It is output to the direction driver 504. A scanning pulse generated by a scanning circuit 505 in synchronization with the timing pulse of the control circuit 502 is input to the X direction driver 503 and Y direction driver 504, and each driver 503, 504 controls the display 300 in the X direction. and the electrodes corresponding to the coordinate values in the Y direction are driven, and the indicated position on the tablet 100 is displayed at the same position on the display 300. Therefore, handwriting of characters and figures written with the magnetic pen 200 on the display 300 stacked on the tablet 100 is displayed as the same handwriting on the display 300 by optical display.

On the other hand, the position data stored in the processing device 600, that is, each coordinate value of a plurality of dots constituting handwritten characters and figures, is sent to the NC drilling machine 80 via a well-known RS232C interface unit 700.
Sent to 0. When the NC drilling machine 800 receives the position data, it moves the table and presses the metal plate 9.
00 to position the part corresponding to the first coordinate value of the position data directly under the drill, and then lower the drill by a predetermined amount to drill a hole at the above position on the surface of the metal plate 900. After this, only the table is moved and the metal plate 900 is moved so that the drill is sequentially positioned at the locations corresponding to the coordinate values in the position data, and the surface of the metal plate 900 is cut with the drill. When the series of coordinate values is completed, the drill is once raised and separated from the surface of the metal plate 900, and the same operation as described above is repeated. Therefore, the characters and figures written with the magnetic pen 200 are printed on the metal plate 9.
The surface of 00 is machined.

In addition, since the position data is temporarily stored in the processing device 600, it is possible to apply the same handwritten characters and figures to a large number of metal plates, and it is also possible to input handwriting to each sheet to create individualized designs. You can also make a product. In addition, the position data is stored in an external storage device (not shown) and retrieved when necessary.
After displaying it on the display 300 and confirming it, the metal plate 900 can also be cut.

Furthermore, the magnetic pen 200 applies a slight bias magnetic field to the magnetostrictive transmission media 101 and 1 of the tablet 100.
02, and there is no need to place it close to the tablet 100 (including the display 300). Therefore, an original metal plate (limited to materials other than ferromagnetic materials) on which handwritten letters and figures have already been applied is placed on the display 300, and the cutting marks of the letters and figures are drawn using the magnetic pen 200. By tracing the coordinates, you can input the coordinate values and obtain a metal plate with the same characters and figures as the original.

Furthermore, character editing and graphic processing functions are added to the processing device 600 so that characters and figures input to the tablet 100 can be modified, added, and deleted, and the position data of the modified characters and figures can be stored.
It may also be sent to an NC drilling machine 800 for cutting.

In the embodiments described so far, the tablet 10
0, the first coil 105 in the X direction, the first coil 105 in the Y direction
The coil 106 is used to generate magnetostrictive vibration waves, and
Direction second coil 109, Y direction second coil 110
was used for detecting magnetostrictive vibration waves, but it may be reversed. In that case, magnetostrictive vibration waves will be generated directly under the magnetic pen 200, and induced voltage will be generated in the second coils 109 and 110.

In the present invention, an element or device that converts magnetic field (magnetic flux) fluctuations into changes in voltage, current, etc., or converts changes in voltage, current, etc. into magnetic field fluctuations is referred to as an electromagnetic converter. In the embodiment, a coil was used as the electromagnetic transducer, but it is not limited to this. In particular, if a magnetic head is used instead of the first coil in the X direction and the first coil in the Y direction, the magnetic flux leaking to the outside can be extremely reduced. It becomes possible to detect coordinate positions with higher precision. Furthermore, in the description of the embodiment, it was stated that the second electromagnetic transducer is disposed over almost the entire length of the magnetostrictive transmission medium except for one end where the first electromagnetic transducer is disposed.
This includes cases where there is a portion that is not disposed between the first electromagnetic converter and the first electromagnetic converter in order to avoid electromagnetic induction due to magnetic flux leaking from the first electromagnetic converter, and the scope of the claims is also interpreted in the same way. It must be.

(Effects of the Invention) As explained above, according to the present invention, a plurality of X-direction magnetostrictive transmission media arranged substantially parallel to each other and a plurality of Y-direction magnetostriction transmission media arranged substantially parallel to each other are arranged. A first X-direction electromagnetic transducer and a plurality of Y-direction magnetostrictive transducers, which have a configuration in which they are superimposed so as to intersect substantially perpendicularly to each other, and are disposed at one end of the plurality of X-direction magnetostrictive transmission media. a first electromagnetic transducer in the Y direction disposed at one end of the medium; and a first electromagnetic transducer in the Y direction disposed at one end of the medium, and an X A tablet having a second electromagnetic transducer including a second electromagnetic transducer in the Y direction and a second electromagnetic transducer in the Y direction disposed over substantially the entire length of the plurality of Y direction magnetostrictive transmission media except for the one end. and a position specifying magnetic generator that generates a sufficient amount of magnetism to increase the local electromechanical coupling coefficient of the magnetostrictive transmission medium and is not connected to any part.
A pulse current is applied to one of the electromagnetic transducer or the second electromagnetic transducer to generate a magnetostrictive vibration wave in each of the magnetostrictive transmission media, and after the magnetostriction vibration wave is generated, the first electromagnetic transducer or A position detection circuit that obtains position data in the X and Y directions of the specified position by the position specifying magnetic generator by detecting the time until an induced voltage by the magnetostrictive vibration wave appears on the other side of the second electromagnetic transducer. Since the position specifying magnetic generator is equipped with a coordinate input device comprising The cord will not break, become tangled, or become loose due to fatigue, so it is easy to operate, and the magnetic generator for positioning can be easily moved to any position. ,
Since the position can be specified by changing the electromechanical coupling coefficient of the magnetostrictive transmission medium by a few Oe in a certain part, the magnetic generator for position specification does not necessarily have to be close to the tablet, and can be spaced several centimeters or more apart. Furthermore, an object other than a magnetic material may be interposed, and the position can be detected with high resolution even in these cases.

In addition, a display is superimposed on the tablet, and a display control circuit that drives the display, an NC machining device main body that cuts the surface of the workpiece according to the position data, and a processing device that controls these are provided. This eliminates the need to move your head to look at the tablet and display alternately as if they were two separate devices, and there is almost no parallax between the position designated by the position designating magnetic generator and the display position, making it extremely convenient. You can input data in a natural way,
In addition, there is no need for complicated programming as with conventional methods; simply operate the magnetic generator for position designation on the display, input any characters or figures, and while checking the input results, the surface of the workpiece is Therefore, even non-experts can easily cut handwritten characters and figures, improving productivity and reducing costs. You can also create unique products by inputting coordinates. Furthermore, as mentioned above, the position specifying magnetic generator only needs to apply a slight bias magnetic field to the tablet, and there is no need to place it particularly close to the tablet. By placing the original document (limited to materials other than ferromagnetic materials) and tracing the cutting marks of the characters and figures with the position specifying magnetic generator, the coordinate values can be input. It has the advantage that it is possible to obtain a product with the same characters and figures as the original.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a perspective view showing an outline of the NC machining device, Fig. 2 is a plan view showing the structure of a tablet, and Fig. 3 is Fig. 2A.
4 is a characteristic diagram of magnetic bias versus electromechanical coupling coefficient, 5 is a sectional view showing the structure of the magnetic pen, 6 is a circuit block diagram of the main part of the device, FIG. 7 is a diagram showing an example of a temporal change in the induced electromotive force generated in the second coil 109 in the X direction. 100...tablet, 200...magnetic pen,
300...Display, 400...Position detection circuit, 500...Display control circuit, 600...Processing device, 700...RS232C interface unit, 800...NC drilling machine.

Claims (1)

[Claims] 1. A plurality of X-direction magnetostrictive transmission media arranged substantially parallel to each other and a plurality of Y-direction magnetostriction transmission media arranged substantially parallel to each other are superimposed so as to intersect each other substantially perpendicularly. an X-direction first electromagnetic transducer disposed at one end of the plurality of X-direction magnetostrictive transmission media, and a Y-direction first electromagnetic transducer disposed at one end of the plurality of Y-direction magnetostriction transmission media. Direction 1
a first electromagnetic transducer consisting of an electromagnetic transducer; a second electromagnetic transducer in the X direction disposed over substantially the entire length of the plurality of magnetostrictive transmission media in the X direction except for the one end; and a second electromagnetic transducer in the X direction and the plurality of Y directions. A second magnetostrictive transmission medium in the Y direction, which is disposed over almost the entire length of the magnetostrictive transmission medium except for the one end.
a second electromagnetic transducer consisting of an electromagnetic transducer; and a position specifying magnetic generator that generates magnetism to an extent that increases the local electromechanical coupling coefficient of the magnetostrictive transmission medium and is not connected to anywhere. and applying a pulse current to one of the first electromagnetic transducer or the second electromagnetic transducer to generate magnetostrictive vibration waves in each of the magnetostrictive transmission media, and after the magnetostriction vibration waves are generated, the first electromagnetic transducer By detecting the time until an induced voltage due to magnetostrictive vibration waves appears in the other electromagnetic transducer or the second electromagnetic transducer, position data in the X direction and Y direction of the specified position by the position specifying magnetic generator is obtained. a coordinate input device comprising a position detection circuit for determining the position data, a display control circuit for superimposing a display on the tablet and driving the display, and a coordinate input device for cutting the surface of the workpiece according to the position data. What is claimed is: 1. An NC machining device characterized by comprising an NC machining device main body that performs operations, and a processing device that controls these devices.