JPH0717118B2 - Control method of automatic drafting machine - Google Patents

Description

The present invention relates to a control method for a multi-pen type automatic drafting machine, and in particular,
The present invention relates to a control method for an automatic drafting machine that optically reads the type of writing instrument based on the information displayed on the writing instrument and controls the head under recording conditions according to the type.

[Conventional technology]

This type of multi-pen type automatic drafting machine is disclosed in JP-A-59-209200.
The automatic drafting machines disclosed in JP-A-59-87199 and JP-A-59-176598, which are described therein, display information about the type on the recording pen, and the above information of the selected recording pen. Is read by a reading device, and optimum recording conditions such as writing pressure and writing speed are set.

[Problems to be solved by the invention]

When the type information of the recording pen is read by an optical reading device provided at a predetermined position, if the light receiving element of the reading device receives excessive external light such as direct sunlight or flash light of the camera, the reading device malfunctions. If the recording conditions such as the writing pressure and the writing speed are set based on the malfunction output, the recording pen may be damaged during drawing. The present invention aims to eliminate the above defects.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention performs a mutual exchange of writing instruments between a stock section that holds a plurality of writing instruments in which information regarding types is displayed and the stock sections, and records on a screen created on a table. The drawing head, the reading device for optically reading the information displayed on the writing instrument, and the storage means for pre-storing the optimum recording conditions according to the type of the writing instrument are provided, and the type of the selected writing instrument is selected. While identifying based on the output information of the reading device,
In the automatic drafting machine that reads the recording condition corresponding to the type from the storage means and controls the recording operation of the drawing head based on the recording condition, before reading the type information of the writing instrument by the reading device, Detecting the intensity of external light entering the light receiving element of the reading device,
It is determined whether or not the intensity of the external light exceeds a preset reference value, and if it exceeds, a preset writing instrument protection processing operation is performed. The structure of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

In FIG. 6, 2 is provided with a writing instrument selective exchange function,
It is a so-called multi-pen type automatic drafting machine, and the table 4
Y rails 6 are supported movably in the left-right direction in the drawing along X rails arranged on both sides of the. An imaging head 8 is attached to the Y rail 6 so as to be movable along the Y rail 6. A bracket 12 is fixedly mounted on a board 10 of the drawing head 8, and a guide hole of an elevating body 16 is slidably inserted into a guide shaft 14 installed between the upper horizontal portion of the bracket 12 and the board 10. There is. Reference numeral 18 denotes a known moving coil device fixed to the bracket, and an elevating shaft 20 connected to the coil of the moving coil device is connected to the elevating body 16. The lifting body 16 is normally in a raised position by the restoring force of the coil spring, and when the moving coil of the device 18 is excited, the driving force of the lifting shaft 20 interlocking with the moving coil moves along the guide shaft 14. It is configured to descend. Details of the device 18 are described in Japanese Utility Model Publication No. 52-46184. A well-known writing instrument holder 22 is attached to the elevating body 16. Reference numeral 24 denotes an optical reading device supported by the bracket 12, which is arranged at a position facing the writing implement 26 held by the holder 22 and is provided with the writing implement 26 by two light receiving elements. The M2 is read, whereby the output end of the reading device 24 is configured to output a 2-bit digital code indicating the type of the writing instrument 26. A known writing instrument stocker 28 holding a plurality of writing instruments 26 is provided on one side of the table 4.
Writing instrument supported on the holder 22 of the drawing head 8
26 moves the head 8 to a pen change point in the stocker 28 in front of the empty writing instrument holder 28a, and moves the head 8 from that position until the holder 22 is inserted into the holder 28a. , The writing tool 26 in the holder 22 is held by the holding section 28a, and then the head 8 is retracted to the original pen change point. When the writing tool 26 is held by the holding section 28a, the holder 22 is empty. With holding part 28a
And the pen placing operation of the head 8 is completed. With the holder 22 empty, the head 8 is moved to the pen change point in front of the holding portion 28b holding the writing instrument in the stocker 28, and the head 8 is held from this position.
The holder 22 is positioned inside the holding portion 28b by approaching 28b, and then the carriage 8 is moved backward to the original pen change point, whereby the writing instrument supported by the holding portion 28b is held by the holder 22. , The pen removal operation of the head 8 is completed. The selective exchange function of the above-mentioned writing instrument has a well-known configuration in an automatic drafting machine, and is not the gist of the present invention, so that detailed illustration and description of its structure will be omitted. A Y motor 30 for moving the head 8 along the Y rail 6, an X motor 32 for moving the Y rail 6 in the horizontal direction in FIG. 6 and the moving coil device 18 are shown in FIG. Thus, it is connected to the driving means 34 of the controller controlled by the graphic drawing output signal of the computer.

Next, the internal circuit of the reading device 24 and the external light detection circuit will be described with reference to FIGS.

The reading device 24 includes a light emitting element 34 (one of which is not shown) composed of two infrared light emitting diodes (infrared LEDs) and a light receiving element 36 (one of which is not shown) composed of two phototransistors arranged in a casing. ) And a comparator 38, the infrared rays projected from the light emitting element 34 are
The writing tool 26 supported by the above is hit, and the reflected light enters the light receiving element 36. The power supply voltage VDD of the light emitting element 34 is supplied by the driver 40, and the power supply voltage VDD of the light receiving element 36 is supplied between the collector and emitter of the phototransistor through the resistance element R. One input terminal of the comparator 38 is connected between the collector of the phototransistor and the resistance element R, and the comparator 38
The comparison reference voltage VF1 is applied to the other input terminal of the. The comparator 38 outputs zero when the input voltage VIN at one input terminal is lower than the comparison reference voltage VF1, and outputs “1” output voltage V3 consisting of a predetermined positive voltage when VIN is higher than VF1. Is configured. The voltage characteristics A and B gradient α indicating the value of VIN corresponding to the amount of light entering the phototransistor, that is, the light receiving element 36, becomes large as the resistance value R of the resistance element R becomes large as shown in FIG. 4b. , The resistance element R
If the value of is small, the above α is also small. FIG. 4a shows the relationship between the intensity of light striking the light receiving element 36 and the collector current of the light receiving element 36, and FIG. 4c shows the relationship between the light intensity and VIN in this embodiment. 42 and 44 are comparators,
One input terminal of each of them is connected between the collector of the light receiving element 36 and the resistance element R, and comparison reference voltages VF2 and VF3 are applied to the other input terminals of the comparators 42 and 44, respectively. When a voltage higher than the reference voltage VF2 is input, the comparator 42 outputs a voltage signal of "1" composed of a predetermined plus voltage, and outputs zero when the input voltage is lower than the above VF2. . Similarly, when a voltage lower than the reference voltage VF3 is input, the comparator 44 has a predetermined positive voltage of "1".
Is output, and zero is output when the input voltage is higher than the above VF3.

The comparators 42 and 44 and the light receiving element 36 constitute an oversized / undersized outside light detection circuit. The comparators 38, 42 and 44 are light receiving elements.
It is provided for each 36. In a state where the external light is zero, the light of the light emitting element 34 is projected on the light reflection mark of the writing tool 26, and the reflected light, when incident on the light receiving element 36, produces a voltage generated at the point C of the light receiving element power supply line VW: In the state of zero external light, the light of the light emitting element 34 is projected on the light non-reflective mark of the writing instrument 26, and the minute reflected light thereof is the light receiving element.
The voltage generated at the point C when the light enters the light source 36 is VB: The voltage generated at the point C when the external light enters the light receiving element 36
If VG: is set, when the external light is incident on the light receiving element 36, the light of the light emitting element 34 is projected on the light reflection mark of the writing instrument 26, and when the reflected light enters the light receiving element 36, A voltage of VW + VG is generated at C, and the light of the light emitting element 34 is projected on the light non-reflective mark of the writing instrument 26 in a state where the outside light is incident on the light receiving element 36, and the minute reflected light is received by the light receiving element 36. When light enters, a voltage of VB + VG is generated at the point C.

If the value of VW + VG above is larger than the value of VF1 above, comparator 3
8 outputs the voltage signal of "1", but the value of VW + VG is VF1
If it is smaller than the value of, the comparator 38 does not output the voltage signal of "1". That is, the reading device 24 does not detect the signal of the light reflection mark of the writing instrument 26.

Therefore, when the value of VW + VG is smaller than the value of VF1, the light reflection mark undetectable signal is sent to the CPU4 of the controller.
It is desirable to output to 6.

That is, when WV + VG <VF1, to obtain the light reflection mark undetectable signal, VG <VF1−VW from the above formula, and the voltage VG corresponding to the intensity of external light is smaller than the value of VF1−VW. At some point, the light reflection mark cannot be detected. This is the same as VF1−
This can be achieved by using VW. That is, the output signal of "1" of the comparator 44 indicates that the light reflection mark cannot be detected.

If the value of VB + VG is smaller than the value of VF1,
The comparator 38 outputs zero, but if the value of VB + VG is larger than the value of VF1, the comparator 38 outputs a positive "1" voltage. That is, the comparator 38 does not output zero. Therefore, when the value of VB + VG is larger than the value of VF1, it is desirable to output the light non-reflection mark undetectable signal to the CPU 46.

When VB + VG> VF1, to obtain the light non-reflective mark undetectable signal, the above equation is set to VG> VF1-VB, and from this equation, VG corresponding to the intensity of external light is the value of VF1-VB. When it is larger, for example, when the sunlight is shining on the light receiving element 36, the non-light-reflecting mark cannot be detected. This can be achieved by setting the reference voltage VF2 of the comparator 42 to VF-VB. That is, the comparator 42
The "1" output signal indicates that the light non-reflective mark cannot be detected.
It should be noted that by making the light non-reflective mark of the writing instrument 26 a highly accurate diffused reflection mark, the above VB can be set to an extremely low value, that is, a value close to zero, thereby preventing the condition of VW + VG> VF1 from being established. And in this case,
The comparator 44 may not be provided. When VB is close to zero, the reference voltages VF1 and VF2 of comparators 38 and 42 are
Can be the same, so that the comparator 42 can also be omitted by connecting the output end of the comparator 38 to the CPU 46 via the AND gate (48).

Next, the operation of this embodiment will be described.

When the writing tool holder 22 holds the writing tool 26, the CPU 46 shown in FIG. 2 detects the writing tool holding state of the writing tool holder 22 by a switch-on signal of a limit switch (not shown) arranged in the writing tool holder 22. The CPU 46 outputs a signal for supplying the power supply voltage VDD to the light receiving element 36 to the power switch control element (not shown) immediately before the writing tool holder descends, that is, the pen down signal is output to the driving means 32, and the light receiving element 36 is output. At the same time that the power VDD is supplied to the energization line of, the CPU 46 turns on the switch 50. Switch 5
When 0 is turned on, the voltage at the point C of the energization line of the light receiving element 36 generated by the outside light is input to the comparators 42 and 44, respectively, and the voltage VIN at the point C is compared with the reference voltages VF2 and VF3, respectively. The comparator 42 outputs zero when VIN <VF2, and VI
Outputs a positive "1" voltage when N≥FV2. Comparator 44
Is set to output zero when VIN> VF3, and output a positive “1” voltage when VIN ≦ VF3. If both comparators 42 and 44 output zero, the CPU 46 then
A "1" signal for causing the light emitting element 34 to emit light is supplied to the driver 40 to cause the light emitting element 34 to emit light. At the same time, the CPU 46 activates the pen type discrimination means 50, and the switch 50
Is turned off and the switch 54 is turned on. The AND gate 48 is shut off by the "1" signal output from the CPU 46 to the driver 40. When the switch 54 is turned on, the lights of the two light emitting elements 34 are emitted from the marks M of the writing instruments 26 facing each other.
It is projected on 1, M2, and the reflected light enters the two light receiving elements 36. The comparator 38 provided in each of the light receiving elements 36 outputs zero when the input voltage VIN is VIN <VF1, and outputs a positive “1” voltage when VIN ≧ VF1. Two comparators 38
The output V3 (one of which is not shown) is input to the pen type discriminating means 52 as a 2-bit coded signal, and the type of writing instrument is discriminated here. This discriminating signal is supplied to the writing pressure / speed setting means 54 provided with a storage means in which recording conditions such as optimum writing pressure / speed according to the type of the writing instrument 26 are stored in advance. The means 54 reads the writing pressure and speed conditions according to the type of the writing instrument 26 based on the pen type determination signal, and supplies the recording conditions to the driving means 34. Next, when a pen down signal and an XY motor drive signal are input from the CPU 46, the drive means 34 supplies a current according to the writing pressure set by the means 54 to the coil of the moving device 18, and by energizing the coil. The tip of the writing instrument 26 contacts the drawing with the set writing pressure. Further, the driving means 34 outputs the XY motor drive signal corresponding to the set speed by the means 54, and controls the movement of the head 8 on the table 4 in the predetermined XY directions at the set speed.

Before the light emitting element 34 is made to emit light, when the input line switches of the comparators 42 and 44 are in the ON state, the light receiving element 36 is in a state where excessive external light or excessive external light is received. One of the comparators 42 and 44 outputs a signal of "1", and the signal of "1" is applied to one input terminal of the AND gate 48. At the other input of AND gate 48,
AND gate because "1" signal is applied in advance
The AND of 48 is established, and the AND gate 48 indicates “1” to the CPU 46.
Input the signal. Based on this "1" signal, the CPU 46 supplies the pen pressure / speed setting means 54 with the pen pressure weakest signal,
Based on this signal, the setting means 54 reads the weakest writing pressure condition stored in advance and supplies it to the driving means 32. In this state, when a pen down signal and an XY motor drive signal are input from the CPU 46, the drive means 32 supplies a current according to the set weakest writing pressure to the coil of the moving coil device 18, and by energizing the coil. The tip of the writing instrument 26 comes into contact with the drawing with the weakest writing pressure set. Also,
The drive means 32 outputs a predetermined XY motor drive signal to control the movement of the carriage 8 in a predetermined XY direction at a predetermined speed. The weakest writing pressure setting prevents damage to the writing instrument 26. The above-mentioned weakest writing pressure setting is a preferable example of the writing implement protection processing operation, but as shown in FIG.
When an excessive or underexternal light detection signal is input to the CPU 46, the CPU 46 energizes the buzzer 56 to issue an alarm and / or drive means.
A machine stop command may be input to 32.

Next, another embodiment will be described with reference to the flowchart shown in FIG.

While the writing tool holder 22 holds the writing tool 26, the CPU 46 closes the power supply line of the light receiving element 36 while the light emitting element 34 is in the OFF state immediately before outputting the pen down signal (step 1). After 500 microseconds, switch 5
When 0 is turned on, it is judged whether the comparators 42 and 44 are outputting "1" (steps 2 and 3), and when "1" is being output, that is, the external light entering the light receiving element 36. If the strength of is less than the specified amount, the CPU 46 inputs the weakest writing pressure command to the driving means 32 (step 4 '). When neither of the comparators 42 and 44 outputs "1", the CPU 46 energizes the light emitting element 34 (step 4). After 500 microseconds, the output of the comparator 38 is input to the pen type discrimination means 52 (step 5), and this discrimination signal is stored in the RAM 58 (step 6). After the elapse of 500 microseconds, the pen type discriminating means 52 discriminates the pen type again based on the output signal of the comparator 38 (step 7). The CPU 46 determines whether or not the current determination signal of the determination means 52 and the previous determination signal stored in the RAM 58 are the same (step 8).
The weakest writing pressure setting signal is output to 32, and if the same, the previous,
The discrimination signal is input to the writing pressure velocity setting means 54 (step 9). The subsequent operation is the same as that described in the first embodiment.

If the comparators 42 and 44 are not used, it is determined in step 2 and 3 whether or not the output of the comparator 38 is "1", and if "1" is output, , Step 4 ′. When the comparators 42 and 44 are omitted, the output terminal of the comparator 38 is connected to the CPU 46, as described above.

The present invention is not particularly limited to the automatic drawing machine provided in the casing of the drawing head 8 as the reading device 24, but an optical reading device 24 'is provided on the stocker 28 side as shown in FIG. The automatic drafting machine provided may be used, or it may be applied to an automatic drafting machine having a configuration in which a reading device is provided on the Y rail 6. As described above, the present invention detects, when reading the selected writing instrument type, whether or not external light on the reference value is incident on the light receiving element of the reading device,
Since the machine is stopped, an alarm is issued, or a writing tool protection processing operation such as setting of the weakest writing pressure is performed when the light is incident, there is an effect that an accident such as damage of the writing tool can be prevented.

[Brief description of drawings]

FIG. 1 shows a preferred embodiment of the present invention, FIG. 1 is a flow chart, FIG. 2 is a block circuit diagram, FIG. 3 is a circuit diagram, and FIG.
FIG. 7 is an explanatory view, FIG. 5 is an explanatory view, FIG. 6 is a plan view, FIG. 7 is a side view, FIG. 8 is a plan explanatory view, FIG. 9 is an external view showing another embodiment, and FIG. Is a block circuit diagram showing another embodiment, and FIG. 11 is a flow chart showing another embodiment. 2 …… machine, 4 …… table, 6 …… Y rail, 8 …… drawing head, 10 …… board, 12 …… bracket, 14 …… guide shaft, 16
…… Elevator, 18 …… Moving coil device, 20 …… Elevation axis, 22 …… Writing tool holder, 24 …… Reading device, 26 ……
Writing instrument, 28 …… Stocker, 30 …… Y motor, 32 …… X motor, 34 …… Light emitting element, 36 …… Light receiving element, 38 …… Comparator, 40
...... Driver, 42,44 …… Comparator, 46 …… CPU, 48 …… And gate, 52 …… Pen type identification means, 54 …… Pen pressure / speed setting means, 56 …… Buzzer, 58 …… RAM

Claims (2)

[Claims] 1. A stocker that holds a plurality of writing instruments on which information regarding types is displayed, a drawing head that exchanges the writing instruments with each other, and records on a screen image on a table, and the writing instrument. A reading device that optically reads the information displayed on the display device, and a storage unit that stores in advance optimum recording conditions according to the type of the writing instrument, and the type of the selected writing instrument is output information of the reading device. In the automatic drafting machine, the recording device according to the type is read out, the recording condition corresponding to the type is read out from the storage unit, and the recording operation of the drawing head is controlled based on the recording condition. Before reading the type information of the writing instrument, the intensity of the external light entering the light receiving element of the reading device is detected, and the intensity of the external light is set to a preset reference value. Example by whether determined that, when it exceeds the control method is characterized in that so as to shift the writing instrument protection processing operations because setting pre Ji. 2. A stocker for holding a plurality of writing instruments on which information regarding types is displayed, a drawing head for exchanging the writing instruments with each other, and recording on a screen on a table, and the writing instrument. A reading device that optically reads the information displayed on the display device, and a storage unit that stores in advance optimum recording conditions according to the type of the writing instrument, and the type of the selected writing instrument is output information of the reading device. In the automatic drafting machine, the recording device according to the type is read out, the recording condition corresponding to the type is read out from the storage unit, and the recording operation of the drawing head is controlled based on the recording condition. Before reading the type information of the writing instrument, the intensity of the external light entering the light receiving element of the reading device is detected, and the intensity of the external light is set to a preset reference value. If it exceeds the threshold, the writing implement protection processing operation set in advance is entered.If not, the type information of the writing implement is read and the read information is stored. The type information of the writing instrument is read again, and it is determined whether or not the read information is the same as the previous read information. If the read information is not the same, the writing instrument protection processing operation set in advance is performed. A control method characterized in that a recording condition corresponding to writing instrument read information is read from the storage device.