JPH0215400B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for controlling the pressure of a recording member for a drawing machine against a drawing paper.

First, in this specification, drawing paper includes general drawing paper and strip coat film, and recording materials include oil-based ballpoint pens, water-based ballpoint pens, consumable writing leads such as pencils, scribe needles, and cutters. etc.

Conventionally, the writing pressure of a writing instrument for a drafting machine on drawing paper has been an unchanging writing pressure due to mechanical action such as a spring or magnetic action. Therefore, when drawing using a consumable writing lead such as a pencil as a writing instrument, if the relative speed between the writing instrument and the drawing paper is slow, the drawing will have a dark line quality, and if the relative speed is fast, the drawing will have a thin line quality. becomes a drawing. Furthermore, when tracing paper is used as the drawing paper, the density of the lines drawn with the consumable writing lead increases, so the difference in density due to the difference in relative speed becomes even more noticeable.

On the other hand, let us consider a case in which a thin peelable film is coated or bonded with an adhesive onto a film base such as polyester, and only the film is cut using a cutter. In this case, even if the pressure of the cutter against the strip coat film is constant, if the relative speed between the two is slow, the cutting edge of the cutter will penetrate deeply enough to damage the base film.
If the relative speed is high, the film cannot be cut sufficiently. If an attempt is made to remove the part of the coated film that is desired to be stripped before the film has been sufficiently cut, there is a risk that unnecessary parts may be removed, and even if the necessary part is removed, the cut end may become fluffy. The strip coat film is often used as a mask for photolithography, and during plate making, these masks are used in layers. However, if the base is scratched, the pattern will be scratched and the quality of the product will deteriorate significantly.

In addition, in the case of automatic drawing machines, since the drawing speed is increasing, there is a large speed difference between the starting speed due to over-deceleration and the constant speed running at high speed. When drawing various figures, differences occur in the constant speeds, and the faster the drawing speed, the larger the difference in the constant speeds. 1 including a straight curve like this
Even when drawing regular lines, the speeds differ between over-deceleration portions and constant-velocity portions, or between constant-velocity portions. Therefore, the prior art has the disadvantage that the wire quality, such as the thickness and density of the wire, or the depth of the cut during cutting, cannot be maintained constant.

Therefore, the present invention proposes a pressure control device for a recording member for a drafting machine, which eliminates the conventional drawbacks and can always draw lines of uniform line quality regardless of the relative speed between the drawing paper and the recording member.

The present invention will be described in detail below based on embodiments shown in the accompanying drawings. Prior to this, I will briefly explain the vertical control of the writing instrument in the NC automatic drafting machine. This vertical control program is given in D code,
For example, D01 is pen down and D02 is pen up. As an example of a program, if you input the commands G01×4000D01CR (CR...carriage return) G01×4000D02CR (program in units of 1/100 mm) into an automatic NC drawing machine, the interface between the mini computer and the drawing machine Plotting is performed while exchanging signals with Ace as follows. In other words, when a pen-down command is sent from the mini-computer to the machine, the pen-down operation is performed, and a completion signal is returned to the mini-computer immediately after the operation is completed. The mini computer immediately moves the machine 40mm in the +X direction while keeping the pen down. When this movement is completed, the next step is entered, and the operations of pen up, movement, and pen down are repeated in the same procedure as described above. This program uses magnetic tape,
It can be input using punch-hole tape, etc.

FIG. 1 is a block diagram showing a conventional pressure control device for a recording member for a drawing machine. 10 is a mini computer, 11 and 12 are output terminals for the down signal b and up signal a, respectively, 20 is a pressure member of a recording member, 21 is a recording member such as a ballpoint pen, pencil or cutter, and 30 is a pressure member. A receiver receives a recording material type selection signal from the member 20; 31 is a down AND circuit that receives a recording material type signal h and a down signal b from the receiver 30; 32;
is a monostable multivibrator receiving the output of the AND circuit 31, 33 is an analog signal generation circuit, 34
35 is an inverter, 35 is an up AND circuit that receives recording material type signal h and up signal a, 36 is a monostable multivibrator, 37 is an analog signal generator, and 38 is an output of inverter 34, recording material type signal h, and down circuit. 39 is an analog signal generator; 40 is an adder for superimposing the output waveforms of the analog signal generators 33, 37, and 39; 41 is an analog calculation circuit; 42 is the analog calculation circuit 41; An adder that superimposes the output and the output of the adder 40, 43 a drive circuit that drives the pressure member 20, 44 a power source, 50 a drawing paper,
51 is a drawing board. In addition, AND circuits 31, 3
5, 38, monostable multivibrator 32, 3
6. Inverter 34 and analog signal generator 3
Although only one set of recording members 3, 37, and 39 is shown in FIG. 1 as a representative example, if there are several types of recording members 21, a plurality of sets are required depending on the number. FIG. 2 shows a circuit provided in the pressure member 20 for generating a recording member type selection signal. 60 is a printed circuit board, 61, 62, 63 are switches, 64, 6
5, 66, and 67 are terminals.

Next, the operation of the conventional device shown in FIG. 1 will be explained. A recording material type selection signal is fed back from the pressure member 20 as a switch signal. This signal can be applied to the switches 61 and 6 shown in FIG.
When the switch 2 and 63 are on, it is a valid signal, and when it is off, it is an invalid signal, and is a signal that specifies the type of recording member by a predetermined combination of switches. Receiver 30 receives this signal and receives recording material type signal h.
emits. On the other hand, if you want to lower the recording member 21, use the output terminal 1 of the mini computer 10.
A down signal b shown in FIG. 1 is generated from 1 to 5, and a recording member down pulse x shown in FIG. When the tip of the recording member 21 contacts the drawing paper 50, the inverter 3
In response to the positive pulse generated at the output of 4, the output of the receiver 30, and the down signal b, the AND circuit 38 issues an output, and the output of the signal generator 39 is as shown in FIG.
A pressure signal y shown in is generated. At the end of this pressurization signal y, an up signal is generated at the up signal output terminal 12 of the mini computer 10, and the AND circuit 3
5 and the multivibrator 36, a recording member up signal z shown in FIG. The waveform obtained by superimposing these signals x, y, and z in an adder 40 becomes a comprehensive reference pressure signal d shown in FIG. This signal d causes the pressure member 20 to raise, pressurize, and lower the recording member 21.

In the prior art shown in FIG. 1, as can be seen from the waveform of FIG. 5, when the recording member 21 moves relative to the drawing paper 50, the pressure applied to the recording member 21 is always constant.

Next, an embodiment of the apparatus of the present invention shown in FIG. 3 will be described. Reference numeral 13 indicates a relative speed signal generating member which is provided in the mini-computer 10 and generates a signal c indicating the relative speed between the recording member 21 and the drawing paper 50, and 70 indicates a pressure member 20 depending on the type of the recording member 21. A magnification selection circuit 71 selectively changes the magnification of the relative speed signal c in order to change the pressure of the relative speed signal c at a constant rate; A multiplier 72 receives the proper relative speed signal e and the down signal b from the multiplier 71 and converts the recording member 21 and the drawing paper 50 into a proper relative velocity signal e suitable for the desired recording member 21. This is a gate circuit that allows a proper relative velocity signal e to pass through when there is contact and supplies the signal e to the adder 42. 80 is
Relative speed signal c from relative speed signal generating member 13
It is an analog signal receiver that receives the signal and sends it to the magnification selection circuit 70. Relative speed signal generating member 1
3. The members in FIG. 3 other than the magnification selection circuit 70, the multiplier 71, and the gate circuit 72 are the same as those shown in FIG.

FIG. 4 is a specific circuit diagram of a circuit including the magnification selection circuit 70 and the multiplier 71 shown in FIG. In the figure, 81, 82 are operational amplifiers, 83, 84, 85
is a resistor, 86, 87, 88 are variable resistors, 91, 9
2 and 93 are analog switches. These analog switches 91, 92, and 93 are opened and closed individually or in combination according to the recording member type signal h. This selective opening and closing changes the resistance value between the non-inverting input of operational amplifier 82 and ground, and thus changes the multiplier of signal c.

Next, the operation of the embodiment shown in FIGS. 3 and 4 will be explained. First, a relative speed signal c shown in FIG. 5 is generated from the relative speed signal generating member 13 in proportion to the relative speed of the recording member 21. When a predetermined switch among the analog switches 91, 92, and 93 of the magnification selection circuit 70 is turned on, an appropriate relative velocity signal e suitable for the desired recording member 21 is generated in the magnification device 71. This proper relative velocity signal e is superimposed with the pressure signal d from the adder 40 in the adder 42, resulting in a total pressure signal f shown in FIG. 5. Since the recording member 21 is pressurized by this signal f,
A large pressure is applied when the relative speed of the recording member 21 is high, and a small pressure is applied when the relative speed is slow. However, the relative velocity signal c is recorded on the recording member 2.
This occurs even if 1 is up, and therefore, the image is drawn when the recording member 21 is supposed to be up. To prevent this, the gate circuit 72 prevents the proper relative speed signal e from passing when the recording member 21 is up.

Note that in the above embodiment, since a plurality of types of recording members 21 can be used, the magnification selection circuit 70
and a multiplier 71. However, if only one type of recording material 21 is used, the magnification selection circuit 70 and the magnification device 71 are unnecessary. However, in this case, it is necessary to adjust the level of the relative velocity signal c to match the recording member 21. Further, in the above embodiment, the relative speed signal generating member 13 is included in the mini-computer 10, but it may be a relative speed signal generating member that detects the actual speed of the recording member 21 and generates a speed signal.

FIG. 6 shows a cutter 211 as an example of the recording member 21, and 1 is a view seen from the side with respect to the direction of movement of the cutter 211, and 2 is a view seen from the direction of movement. The locus of the tip of the cutter 211 when this cutter 211 is used in the apparatus of the present invention is shown by a solid line in FIG. 5 and 9. 501 is a coat film of a strip coat film, and 502 is a film base of the film. It can be seen that when the conventional device is used, the depth of the cut becomes shallower as the relative speed increases, as shown by the broken line. However, when using the device of the present invention, the depth of cut is always constant even if the relative speed changes.

Since the structure of the present invention is as described above, it has the following effects. Regardless of the value of the relative speed between the drawing paper 50 and the recording member 21, the drawn line quality will be uniform because the pressure can be automatically changed according to the relative speed. That is, a pencil as the recording member 21;
Even if the drawing speed varies in various ways using a consumable writing lead such as a ballpoint pen, the density and thickness of the line are always constant. Furthermore, even if a cutter is used as the recording member 21 and a strip coat film is used as the drawing paper 50, and the relative speeds of these are changed,
The coat film can be sufficiently cut without damaging the base film.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional pressure control device for a recording member for a drawing machine, FIG. 2 is a circuit diagram for generating a recording member type selection signal in the device shown in FIG. A circuit diagram showing one embodiment, FIG. 4 is a specific circuit diagram of a circuit including a magnification selection circuit and a multiplier in the circuit shown in FIG. 3, and FIG.
Waveform diagrams of the main parts of the circuit shown in Figures and Figure 3,
FIG. 6 is a diagram showing the shape of a general cutter. 10... Mini computer, 13... Relative velocity signal generating member, 20... Pressing member for recording member, 21... Recording member, 40, 42... Adder,
50... Drawing paper, 70... Magnification selection circuit, 71
... Multiplier, 72 ... Gate circuit.

Claims (1)

[Scope of Claims] 1. When the recording member and the relative speed signal generating member that generates a relative speed signal corresponding to the relative speed between the recording member and the drawing paper are in contact with the recording member and the drawing paper. a gate circuit that allows a relative velocity signal to pass through the recording member and blocks the signal in a non-contact state; a pressure member that applies pressure against the drawing paper to the recording member in accordance with the relative velocity signal that has passed through the gate circuit; A pressure control device for a recording member for a drafting machine, comprising a magnification selection circuit that selectively converts the relative velocity signal according to the type of the member. 2. The pressure control device for a recording member for a drafting machine according to claim 1, wherein the recording member is an oil-based ballpoint pen, a water-based ballpoint pen, a consumable writing lead such as a pencil, a scribe needle, or a cutter.