JPS5923280B2 - automatic drawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic drafting machine, and more particularly to a computer-controlled automatic drafting machine.

Automatic drawing machines that automatically draw drawings under computer control are used in many fields.

In conventional automatic drafting machines, coordinate reading devices are generally used to input coordinate data, but since the reading table and writing or drafting table are arranged on a flat surface, when using a conventional automatic drafting machine, there is a considerable amount of space in the horizontal plane. Requires space.

Further, a C hollow pen is attached to the writing head of an automatic drafting machine as a writing implement, but if the hollow pen is stopped in use, the ink dries up and it becomes impossible to write when used again.

For this reason, some methods have been used in the past to maintain high humidity in the vicinity of the hollow pen tip by permanently providing a sponge or the like moistened with moisture.

However, in such a method, the humidification effect near the pen tip becomes quite unstable considering the movement of the hollow pen.

Therefore, an object of the present invention is to provide an automatic drafting machine that can save planar space and automatically perform stable drafting.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, a coordinate reading device, that is, a tablet 11 is provided on a drawing panel 12 that can be opened and closed, and a reading table 13 made of a transparent material, for example, glass, and a position coordinate detection instruction that can be freely moved on the reading table. It has a cursor 14.

This position detection instruction cursor is connected to the processing device 15 by a cord 14c.

In this processing device, the position coordinates of the position detection instruction cursor 14 on the reading table 13 are determined based on the position detection instruction signal from the cursor 14.

Note that the keyboard 16 and operation panel 17 of the processing device 15
A display device 18 is also provided on the front.

A writing device 19 is disposed at the bottom of the tablet 11.

This writing device has a drawing table 20 provided facing a reading table 13 supported by a tablet 110 and a drawing panel 12.

This drawing table 20 and the drawing panel 1 of the tablet
A writing head 21 is provided in the space between the two.

This writing head is provided on an X-direction sliding rail 23 that runs on rails 22a and 22b arranged on both sides of the drafting table 200, and is constructed so that it can run on this sliding rail in the Y-direction.

The writing head 21 is provided with a magnetic detector 21a composed of a Hall element and a hollow pen 21b.

The reading table 13 is mounted on a drawing panel 12 that can be opened and closed about a hinge 12a.
(not shown).

Also, when this drawing panel is closed, the sponge 2
4alC shields the area around the drafting table 20 from the outside atmosphere.

The region in which the writing head 21 can move, that is, the space between the drawing panel 12 and the drawing table 20 is further sealed by a sealing plate 24.

Air having a predetermined temperature and a predetermined humidity is sent into the sealed space from the atmosphere control device 25.

This atmosphere control device 25 has a pump 27 connected to an air pipe 26 that communicates with a part of a sealing plate 24 forming a sealed space, and draws in and discharges air from the space.

The outlet of this pump is connected to the sealed space through a cotton filter 28, a heat insulator 29, and an air pipe 30 for feeding air.

In addition, a humidifier 3 is connected to the air pipe 30 via an electromagnetic valve 31.
2 are concatenated.

This humidifier 32 is supplied with water from a water storage tank 33.

The temperature of the heat insulator 29 is controlled by a signal from a thermistor 21c provided in the writing head 21 and detecting the temperature of the closed space.

Further, the electromagnetic valve 31 connected to the humidifier 32 is controlled to open and close by a signal from a humistor 21d attached to the writing head 21 and detecting the humidity in the closed space.

Next, the electric circuit configuration of the above-mentioned automatic drawing machine will be explained.

As shown in FIG. 3, the operating section 14 of the position detection instruction cursor
b is coupled to electromagnet 14a and controls the excitation of this electromagnet.

The magnetic field generated by the electromagnet 14a is detected by the magnetic sensor 521a of the writing head 21.

That is, the position detection instruction cursor 14 is magnetically coupled to the writing head 21 via the electromagnet 14a.

For example, a Hall element 21a- that constitutes the magnetic detector 21a
1, 21a-2 is a voltage signal conversion circuit 34 that converts the output of the Hall element into a voltage signal. ．． 34-2 respectively.

Voltage signal conversion circuit 34, . The output of 34-2 is connected to a differential amplifier 35 and to threshold setting circuits 36 and 37, respectively.

The output of the differential amplifier 35 is connected to the absolute value circuit 38 and the voltage -
It is connected to one input of an AND gate circuit 40 via a frequency conversion circuit 39 .

Further, the output of the differential amplifier 35 is connected to one input of a gate circuit 40 via a comparator 41.

The outputs of the threshold value setting circuits 36 and 37 are connected to the other input of the AND gate circuit 40 via an OR gate circuit 42.

The output of this AND gate circuit 40 is connected to a selection gate 43.

The output of this selection gate 43 is connected to a pulse counter 44.

The number of pulses counted by the pulse counter 44 corresponds to positional coordinates, and a means for detecting the positional coordinates, that is, a magnetic detector 21a for obtaining pulses in this embodiment.
A position M coordinate detection device is formed by the circuit configuration from 1 to 44 and a pulse motor 48 that drives the writing head 21 to which the magnetic detector 21a is attached.

The selection gate 43 and the pulse counter 44 are also coupled to an arithmetic processing circuit 45, and this arithmetic processing circuit 45 is connected to the keyboard 1.
6 and storage device 46 .

The output of the pulse counter 44 is sent to the pulse motor drive circuit 41
It is coupled to a pulse motor 48 via.

This pulse motor 48 is coupled to provide driving force to the writing device 19 for moving the X-direction slide rail 23 and writing head 21 of the writing device 19 of FIG.

The operation of the above-mentioned automatic drawing machine will be explained.

When the position coordinate detection instruction cursor 14 shown in FIG. 1 is moved to a predetermined position on the reading table 13, that is, within the magnetic detection range, and the operation button of the operation section 14b is pressed, the electromagnet 14a
At the same time as the
4c to the processing device 15.

In response to the position detection instruction signal, the processing device 15 calculates the position of the cursor 14.

At that time, the writing head 21 of the writing device 19 is moved to the cursor 14.
Move to the center position.

That is, the difference between the position information of the writing head 14 and the position information of the cursor 14 is calculated in the processing device 15, the traveling speed of the writing head 210 is determined according to the difference signal, and the writing head 21 moves to the center position of the cursor 14 at this speed. As it moves, its position coordinates will be detected.

To explain this in more detail, the writing head 21 reaches the cursor 14, the magnetic detector 21a of the writing head 21 detects the magnetic field of the electromagnet 14a of the cursor 14, and the detector 21a detects the magnetic field of the electromagnet 14a of the cursor 14.
Hall elements 21a, -x, 21a-2 generate output signals.

The output signals of these Hall elements are transmitted to the electronic signal conversion circuit 34-
1.34-2 to the differential amplifier 35.

This differential amplifier 35 generates an output signal according to the difference between the output signals of the Hall elements, and this output signal is converted into an absolute value by an absolute value circuit 38 and supplied to a voltage-frequency conversion circuit 39.

Further, the voltage signal conversion circuits 34, . The voltage signal 34-2 is supplied to the AND gate circuit 40 via the threshold setting circuits 36 and 37 and the OR gate circuit 42.

If the signal passed through the OR gate circuit 42 is large enough to be distinguished from noise, the AND gate circuit 40
will be held.

This AND gate circuit 40 includes a voltage-frequency conversion circuit 3.
9 supplies a pulse signal corresponding to the positional difference between the magnetic detector 21a and the cursor 14.

Since this pulse signal is an absolute signal, its level is converted according to the polarity recognized by the comparator 41.

The position difference pulse signal passed through the AND gate circuit 40 is supplied to a pulse counter 44 via a selection gate 43.

This pulse counter 44 detects the number of pulses and the rotational direction of the pulse motor.

The selection gate 43 is configured to receive a pulse signal only when the position detection instruction control operation section 14b is in operation.

The output signal of the pulse counter 44 is sent to the motor 1 drive circuit 47.
is supplied to operate this drive circuit.

As a result, the pulse motor 48 receives the drive signal from the motor drive circuit 47 and rotates according to the count of the counter 44.

On the other hand, information indicating the X-coordinate position obtained by the pulse counter 44 is transferred to the arithmetic processing circuit 45 by pressing a switch provided on the operation section 14b.

The transfer information is stored in the storage device 46 after being subjected to predetermined arithmetic processing by pressing a predetermined key on the keyboard 16 .

This stored information is read out according to the purpose and selected by the selection gate 43.
and ultimately drives the pulse smoke 48.

The writing head 21 is moved by the driving force of the pulse motor 48, and the hollow pen 21b attached to the writing head 21 comes into contact with the paper surface for drawing.

In this way, drawing is performed in the X direction, but drawing is also performed in the Y direction according to a similar operation.

Note that the paper placed on the drawing table 20 is replaced by opening the drawing panel 12, which can be freely opened and closed.

While the writing operation is being performed as described above, the atmosphere control device 25 is operated to maintain the writing atmosphere in a good writing state.

That is, the air in the space sealed by the sealing plate 24 is sent to the cotton filter 28 by the pump 27, and this filter removes dust particles of about 3 to 5 μm in the air.

The air passing through the filter 28 is kept at a predetermined temperature, for example, 20° C. or higher, by a heat insulator 29.

The air sent from the heat insulator 29 is maintained at a predetermined humidity level, for example, between 60 and 80 degrees centigrade, by a humidifier 32.

The air kept at such temperature and humidity is circulated in the closed space, and the writing condition with the hollow pen 21b of the writing head 21 is maintained in the best condition.

As explained above, according to the present invention, the reading table and the drafting table have a two-tier structure, upper and lower, so the space required for installing an automatic drafting machine is reduced to about half that of the conventional one, and the reading table is not blocked during reading. When this is done, dustproofing and soundproofing effects can be obtained.

Furthermore, when the atmosphere control device is coupled to the closed space, an atmosphere is created in the closed space that provides the best writing conditions with the writing pen, so that blurring and the like will not occur.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an automatic drafting machine according to an embodiment of the present invention, FIG. 2 is a side view of the automatic drafting machine of FIG. 1, and FIG.
The figure is a circuit diagram of an automatic drawing machine. 11...tablet, 12...l panel, 12a...scolding, 13...reading table, 14...position detection instruction cursor, 19
... Writing device, 20 ... Drafting table, 21 ... Writing head, 21a ... Magnetic detector, 21b ... Hollow pen, 25...
...Atmosphere control device.

Claims (1)

[Scope of Claims] 1. A reading table that can be opened and closed, a position detection instruction cursor that is provided to be freely movable on the reading table and that instructs detection of position coordinates on the reading table, and a position detection instruction cursor that instructs detection of position coordinates on the reading table; a position coordinate detection device that detects the position coordinates of the instruction cursor on the reading table in response to a detection instruction signal; a drafting table disposed under the reading table facing the reading table; a writing head disposed in a space between the table and the drafting table, the writing head moving to a position corresponding to the position coordinates detected by the position coordinate detection device and writing on the paper placed on the drafting table; . An automatic drafting machine configured such that the space becomes a sealed space when the reading table is closed. 2. The automatic drafting machine according to claim 1, wherein a hollow pen is attached to the writing head as a writing instrument. 3. The method according to claim 1 or 2, wherein an atmosphere control device is coupled to the space in which the writing head is disposed, and the space is maintained in an atmosphere suitable for writing by the atmosphere control device. Automatic drawing machine.