JPS58212956A - Ink jet type recorder - Google Patents

Abstract

PURPOSE:To provide the titled apparatus for X-Y plotter, etc. capable of drawing a line of fixed width regardless its recording speed by such an arrangement wherein a liquid surface stabilizing member for preventing the shaking of ink surface is provided in an ink tank and a pressure acting on the surface of ink is controlled in response to recording speeds. CONSTITUTION:In an ink tank 14, a liquid surface stabilizing member 122 (preferably, synthetic fiber, etc.) for preventing the shaking of ink surface is mounted, and ink is caused to impregnate therein. As said stabilizing member, a laminated plate or metallic nets 123 may be used, or a circular float cover 124 made of foamed polyethylene, cork, etc. of which specific gravity is smaller than ink may be used. By this, the shaking of liquid is prevented when an ink jet generator spouts ink jet while it receives acceleration in the direction perpendicular to the direction of ink jet, and it spouts ink jet stably. USE:This is most suitable to a recording head in a line recorder such as X-Y plotter for automatic drawing, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an Infusiera 1 type recording device, more detailed description.
is X − Y ', /' n used in self-8 drafting etc.
The present invention relates to a recording device using an electric ejector type 1 inkjet generator that can be used as a recording head in an image recording device such as an ivy.

Generally, in a line recording device such as an X-Y printer, a so-called contact type recording tool such as a hollow pen or a ballpoint pen is used as the recording head. but,
These contact-type recording devices have poor durability and must be replaced frequently, making it difficult to perform high-speed recording and thin-line recording, and also tend to produce uneven recording line temperature and noise. There were many drawbacks.

For this reason, in recent years, so-called ink jets that cause the ink in the ink tank to flow through a nozzle with a minute diameter have been introduced.
Attempts have been made to adapt the generated radiation to the recording heads of image recording devices such as X-Y plotters.

Various devices have been proposed for this type of inkjet generator, but when used in the recording head of an image recording device, the continuity of the image and the Geno 1-style ON -, O
Considering the responsiveness of F F, electric field whisper sword type inkji 1
Type 1~ Generator is the most suitable.

This electricity generation device [114 type inkjet, tsu 1 ~ generator] Ink is guided from the ink tank to the nozzle, and in a stationary state (ma, a minute pressure is applied to the ink to the extent that the ink forms a meniscus at the tip of the nozzle, By applying a high electric field between the conductive nozzle and the 110-speed electrode installed in front of the nozzle, the ink is drawn out of the nozzle and ejected as a jet stream.

By using this type of inkjet generator,
Although many of the disadvantages of conventional contact-type recording devices are solved, since it is a non-contact type, there are the following disadvantages not found in conventional contact-type recording devices. 71
'In other words, when applying this type of generator to an image recording device such as an X-Y plotter, the relative moving speed between the recording head and the recording material (e.g., paper, film, etc.) , since it varies depending on the state of the recorded line, IJ
If the ink width is constant, the width and density of the print line will change depending on the recording speed, which is particularly inconvenient for automatic drafting. Also, the jetted ink solution acts on the nozzle inlet) f
In other words, the ink is affected by the sum of the pressure acting on the ink surface (e.g. air pressure) and the hydrostatic pressure of the ink from the ink surface to the nozzle inlet, so when recording for a long time, the ink drop in the ink tank decreases, causing the ejection of the ink. As the amount of ink fluctuates, the jet ON characteristics deteriorate significantly. Therefore, it is not possible to use all of the ink in the ink tank, and only a sufficient amount of suspension that does not affect the ejected ink flow is used. There is a drawback that the recording time is extremely short with only a small amount of filling.Furthermore, there is a problem that when the surrounding conditions of the inkjet generator change, the ink material f11 changes and the amount of ejected ink fluctuates. With generators, the ink surface inside the ink tank shakes due to acceleration during movement, causing maintenance problems such as ink spilling out of the ink tank, and the ejected ink drop is proportional to hydrostatic pressure. However, when the ink surface fluctuates, even when the recording speed is constant, the distance between the ejected inks changes due to the influence of hydrostatic pressure, resulting in a problem in which the quality of equal image lines deteriorates, causing unevenness in image line width.

The present invention is based on various research conducted to solve such problems.When the applied voltage is constant, the pressure acting on the ink and the ejected ink are in a proportional relationship, and the applied voltage and recording speed are constant. It was discovered that when the ejected ink tension is changed by appropriately changing the pressure acting on the ink surface, if a diagram is drawn by taking the logarithm of the ejected ink amount and the recording line width, there is a linear relationship between the two. From this, if the physical properties of the ink, the shape of the nozzle, etc. are kept constant, the relative relationship between the ejected ink droplet, the pressure acting on the ink, the recording line width, and the recording speed can be determined. It was discovered that by accurately controlling the amount of ink corresponding to the recording speed, it was possible to obtain an amount of ejected ink that corresponded to the recording speed, and it was possible to always obtain a constant recording line width.Based on this, the completed C be.

The main object of the present invention is to provide an Infusiera 1 set recording apparatus that is equipped with a pressure control means that controls the pressure acting on the surface of ink in accordance with the recording speed, and is capable of drawing lines of a constant width regardless of the recording speed. In addition, the image recording device equipped with such Infusiera 1~ type recording device, especially the X-
The purpose is to provide a Y plotter, and roughly speaking, this
- The purpose is to provide a specific control circuit that associates the servo control mechanism of a Y plotter with the pressure control mechanism described above, and further provides pressure control when the above inkjet generator is used in a recording head of an XY plotter. The purpose is to provide a concrete device associated with the mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1 showing an X-Y plotter according to the present invention, rails 3 and 4 are fixedly installed on both sides of the ten sides of a main body 2, and a rack is cut into the rail 3. The X-moving girder 5, which extends over the pair of rails 3.4 and moves in the X direction, is fixed on a support base 6.7 that is slidable on the rails 3.4. An X''i+-motor 8 is installed within the support base 6, and drives a binion gear (not shown) that engages with the rack of the rail 3 via an appropriate transmission mechanism, thereby moving in one direction. A Y one-way rail 9 is installed parallel to the X moving girder 5, and a rack is cut in this Y one-way rail 9 as well.The slider 10 can be freely slid on the Y one-way rail 9. Y-1 no. is provided in the mover 10.
A motor 11 is installed, and the Y-
17 A binion gear (not shown) that meshes with the rack of the self-rail 9 is driven to move in the Y direction.

An inkjet generating device 13 is installed on the mover 10 by a head body 12, which moves integrally with the mover 10, and jets ink by a control mechanism to be described later.
Object recording is performed using an X-Y servo mechanism.

A flexible air pipe 18 that sends compressed air to the ink tank 14 and a high voltage cable 19 from a high voltage power source are connected to the inkjet generator 13. It has enough properties to prevent this from happening, and is connected to the control unit, compression pump, etc. inside the main body 2.

The upper surface of the main body 2 is a drawing board 20, which supports a recording material (II, film, etc.) 21 while maintaining its flatness.
There is C.

This X-Y plotter device receives plotting pattern signals (output from a printer, etc.),
Drawing is performed by controlling the rotation angles of the revo motors 8 and 11 of each Y8.

Further, as shown in FIGS. 2 and 3, the ink jet generating device 13 includes an ink tank 14 for storing onk 17, and a nozzle 15 attached to the ink tank for guiding ink to the outside. and a counter electrode 16 installed close to the nozzle.

As shown in FIG. 2C and FIG. 3, two positioning bottles 61 are fixed to the outer periphery of the ink tank facing each other. 1iij71. A metal nozzle fixing cylinder 62 is attached to the bottom of the ink tank 14 as best shown in FIG.
A metal nozzle guide ring 63 is fixed, and a metal nozzle 15, which is attached by soldering or the like, passes through the center of the guide ring 63 to the tip of the nozzle fixing tube 62 (Fig. 3e). . An outer cylinder 64 made of an insulating material, for example, a synthetic resin such as formaldehyde polymer, is attached to surround the nozzle fixing cylinder 62, and an annular opposing type VM 16 is attached to the tip of the outer cylinder 64. A seal between the ink tank 14 and the nozzle fixing cylinder 62 is achieved by an O15 ring 65.

The main body 12 consists of an upper main body 12a and a lower main body 12b, and an ink tank 14 is located in the center of the upper main body 12a.
An annular hole 66 with a diameter slightly larger than the outer diameter of (-J
Two opposing notches 67 are provided around the periphery (FIG. 3a). In the center of the lower body 12b, as shown in FIGS. 3c and 3d, annular grooves 68 and 69 having a diameter slightly larger than the sunset of the ink tank 14 are provided facing each other from above and below. has an annular 1M68,6
An annular hole 70 with a diameter slightly larger than the outer diameter of the outer cylinder 64 is installed to connect the upper annular groove 68. A shallow groove with a large diameter is also provided, and an ink tank fixing ring 72 is installed in this shallow groove. This fixing ring 72 has two bottles 73 facing downward.
is fixed, and a spring 14 is attached to one bottle 13.
Since the ring is locked, the fixing ring 72 is always given a rotational force in one direction, but it is held in place because the tip of the release button 75 is engaged with the other bottle 73. There is.

The fixing ring 72 is provided with a notch 76 through which the positioning bottle 61 of the ink tank 14 can pass, and an inclined part 77 connected to the notch 76 around the inside of the fixing ring 72 . A high voltage electrode ring 78 is disposed at the bottom of the upper annular groove 68, and three 8-loaf electrode contact pieces 19 are soldered on the upper side thereof. This high voltage electrode contact piece 19 is attached to the ink tank +1. ! I contact the 7 ring part of the nostle fixing member 62, and connect one end to the connector 80.
A high voltage is applied to the nozzle 15 from lead wires 81 whose other ends are respectively connected to the high voltage electrode rings 78 and routed through the wiring of the head body. A counter electrode ring 82 is disposed within the upper annular groove 69, and three counter electrode contact pieces 83 are soldered downward (=J i ) around the inside of the ring. This counter electrode contact piece 83 has elasticity, and when the ink tank is attached, its tip contacts the counter electrode 16, and one end is connected to the connector 80 and the other end is connected to the counter electrode ring 82, and the wiring is routed through the wiring of the head body. lead wire 8
4 (of opposite polarity to the voltage applied to the nozzle) is applied to the counter electrode 16. The counter electrode ring 82 and the inner electrode contact piece 83 are surrounded by the protective tube 60 .

When the positioning bottle 61 is inserted into the annular hole 66 according to the positions of the notch 67 and the notch groove 71 of the ink tank main body 12, the positioning bottle 61 initially comes into contact with the inclined part 77 of the ink tank fixing ring 72 (Fig. 4a), and then is further pushed down. and ink tank fixing ring 72
rotates in the direction of the arrow as shown in FIG. 3d and FIG.
The ink tank fixing ring 72 enters the cutout groove 11 and returns to its original position by the action of the spring 14, as shown in Fig. 4c.
), the ink tank 14 is installed as shown in Figure 2, c.

Fitting 85 is attached to the top of the ink tank.
2 is removably attached, and the pipe 18 is connected by a joint 85.
The ink tank 14 is contacted.

To attach or detach the ink tank, press the release button 15 to push the bottle 73 that engages with it, rotate the ink tank fixing ring 12 in the direction of the arrow, and release the notch 76.
The ink tank moves to the position of the notch groove 71, so the ink tank is pulled up in this state. Observation magnifying glass 87
is installed. This optical system loupe, which consists of a reflecting mirror 87a, an objective lens, and an eyepiece lens, has a fixing bin 88.
The loupe support part 4489 has a J: spatula (ζ) which is removably held in the main body 12. The head main body 12 has a hole 9o into which the fixing pin 88 is fitted, and a radius of curvature that is the same as the outer circumference of the loupe tube. The jet observing magnifying glass 87 is positioned and attached by inserting the fixing bottle 88 into the hole 91 while aligning the magnifying glass cylinder part with this concave cavity 91. As shown in Figure 3 ej,
A slit 92 is provided for the observation slit 1, which is set so as not to disturb the symmetry of the electric field.

FIG. 5 shows the pressure horns acting on the ink surface and the ejected ink ω using the inkjet generator configured as described above.
This shows the results of investigating the relationship between This is done by applying a constant voltage between the nozzle 15 and the counter electrode 16 for a certain period of time using the switching voltage of the inkjet generator 1-, and changing the pressure acting on the ink surface appropriately to eject the ink every second. Prower 1 as a change in ink loading
It's a long way off. From this figure, it can be seen that the ejected ink loss is proportional to the pressure over a fairly wide range.

FIG. 6 shows the relationship between the ejected ink spear and the recording line width. This involves wrapping the recording material on a drum that rotates at a constant speed, moving the inkjet generator at a constant speed in the direction of the rotational axis of the drum, and feeding compressed air into the ink tank. Then, by changing the pressure appropriately, the ink pressure is changed, and the state of change in the recording line width at that time is shown in Figure 1. It is understood that the width has a linear relationship on the logarithmic scale.It is also clear from this experiment that the slope of the straight line in this figure is determined by other factors such as the physical properties of the ink. became.

Therefore, it is clear that by accurately controlling the pressure acting on the ink surface in accordance with the recording speed, it is possible to obtain an ejected ink pressure that corresponds to the recording speed, and to always obtain recorded lines of a constant width. Ru.

For this reason, the inkjet recording apparatus of the present invention (31) is equipped with a means for controlling the ejected ink skewer according to the recording speed, and this is provided with an X-Y control mechanism of the X-Y plotter and related components.
Hereinafter, the relationship between the X-Y control 1m 414 and the pressure control means of the inkjet recording apparatus will be explained.

FIG. 7 is a block diagram of the X-'Y Leevo control il1 mechanism.

Usually, in an X-YJ plotter device, the mover 101
However, it is necessary to control the position of the (recording head) very accurately, so the position control is very precise. method is adopted. Further, the control mechanism shown in the figure is an example in which the target position signal is a digital signal such as the number of pulses, and an analog servo motor is used as the servo motor. X-Y
Servo control is X.

The X-control system will be explained below because the control is carried out independently in each direction in the Y direction and is substantially the same.

Computers, etc. (not shown)! When a plotting signal is output as -puts 1 and inputted to the ink face 22 of the servo control mechanism, an X-target position signal is output as a digital signal, which is compared with the X-position signal by a comparator 23, - After being converted into an analog signal by an analog converter (D/A converter) 24, it is amplified by an I skip spinning. At this time, the output of the X-servo motor 8 is detected by the X-speed detector 26. X-position detector 27
The signal from the speed detector 26 is fed back to the front stage of the X-servo amplifier 25 via the X-speed feedback amplifier 28. Further, the output of the position detector 27 is converted into a digital signal by an analog-to-digital converter (A/D converter) 29, and then inputted to a comparator 23, and the position is controlled while being compared with the target position signal. It is made to be done. In this case, the speed is detected by detecting the rotational speed of a tacho generator or the like attached to the servo motor shaft, and the position is detected by a resolver or the like.

In addition to such a servo control mechanism, the X-Y plotter apparatus of the present invention includes a pressure control mechanism for controlling the amount of ink ejected by the inkjet generator according to the recording speed. It detects the rotation speed of each of the X and Y 1-nervo motors as the output of the above-mentioned 1-nervo motor, and outputs it as speed signals ■×, ■y. It controls the pressure acting on the ink tank, and FIG. 8 shows a block diagram of this pressure control mechanism.

In the interface 31 of the pressure control mechanism (, 1, 9th
There is a recording speed signal V production circuit as shown in the figure, and when an x-speed signal vx and a Y-speed signal @vy are input, each
Squared by squaring circuits 32 and 33, vx2 by tightening circuit 34
! +Vl/2 is taken, and the square root circuit 35 creates a recording speed signal V=VX +VV2.

This recording speed signal V is sent from the interface 31 to an analog comparator 36 consisting of a voltage gain -10 differential amplifier, etc., and the output (analog signal) of the pressure laser 38 that detects the air pressure of the compression pump 37 is amplified by the feedback amplifier 39. The comparison signal is input to the controller 40. The controller 40 is composed of a window comparator, a pulse converter, etc., and sends a clock pulse to the next stage pulse motor drive circuit 41 only when the absolute value of the input error signal (comparison signal) is larger than the window width (±vR). Set 4 to send signals cw and ccw synchronized with . Signal CW
The signal CCW is generated when the IJ error signal is greater than +vR, and the air compression system 42 acts to increase the pressure, and the signal CCW is generated when the error signal is smaller than -VR.
2 acts in the direction of lowering the pressure jJ, and the error signal is V. and-
If the value is between VR, the controller 40 will not issue a signal.

The pulse motor drive circuit 41 is a circuit that converts the signals @cw and ccW into signals for driving the pulse motor 43 and amplifies the signals. When the input signal is OW, the pulse motor 43 is rotated in the normal direction. The air pressure of the compression pump 37 is increased and the CCW rotation is reversed.

The air pressure inside the compression pump 37 is detected by the pressure sensor 38, amplified by the feedback amplifier 39, and then sent to the comparator 3 as described above.
6 and pressure control is performed while being compared with the recording method Iσ Shingetsu V.

For example, when the value of the recording speed signal V increases, the output of the pressure sensor 38 at that moment is smaller than the speed signal V, the comparator 36 outputs an error signal, and the controller 40 outputs the signal C.
W is released and acts to increase the pressure as described above.

In addition, the drawing signals of the computer, etc. mentioned above include an inkjet ejection control signal Sd at the end of the X-Y servo control signal, and are synchronized with the X-YI navigation control operation. The signal is sent directly to the interface 31 of the pressure control mechanism as an inkjet ON-OFF signal. This 0N-OFF signal of the inkjet corresponds to the pen's "U D-D own"' signal in an X-Y plotter using a conventional contact writing instrument, and the high-voltage pulse generator is used only when required. 50, a switching high voltage is applied to the nozzle 15 of the inkjet generator 13, and the jets 1 to 1 are ejected.

The relationship among the speed 1η signals vx, vy, v, the pressure P1 acting on the ink, the voltage Vj applied to the nozzle, the recording line width, and the inkjet ejection control signal (printing command) Sd is shown in FIG. 10 at a time chill rate. Show J゛. That is, when a plotting signal is input, the X-Y servo control mechanism operates to move the mover (recording head) 10 to a predetermined position and issue the plotting command Sd.
When the inkjet generator 13 enters the inkjet generator 13, a pressure corresponding to the recording conductivity V and an emission ON voltage are applied to the inkjet generator 13. Therefore, the recording line width becomes constant regardless of the recording speed V, and the ON-OFF of the jet is also performed in extremely good accordance with the drawing command Sd. ON-OFF of this Infusiella 1~
This can be carried out at high speed, for example, by applying a bias voltage between the nozzle and the accelerating electrode and applying a switching voltage in accordance with a plotting signal. In Figure 11, a constant pressure (atmospheric pressure) is applied to the ink surface in the ink tank, and a bias voltage of 800V is applied to the electric field injection type inkjet generator using bias voltage #I30 to form a meniscus at the tip of the nozzle. , 1ooov as the switching voltage by the high voltage pulse generator 50
This figure schematically shows the state of injection of Infusiera l- when superimposed on the bias voltage. In this case, the response of 4° to the switching voltage ON at the start of injection is 1 to
3m5ec, and the injection stop switching voltage OF
The response to F was less than 0.5 m sec. Therefore, for example, a contact type using a conventional pen (pen 1
Compared to the responsiveness to the plotting signal of the JpQOWn type), the 0N-OFF characteristics of the Infusiera] flow are extremely good (more than an order of magnitude faster), and can be used for X-Y vines, etc. I understand that.

Next, tenii [! Next, the specific mechanism of the air compression system of the ink jet generator in the X-Y plotter will be explained.

As shown in FIG. 12, the air compression system 42 responds to the output signal from the pulse motor drive circuit 41 mentioned above.
In order to convert the rotation angle of this pulse motor 43 into a linear displacement amount corresponding to Converter 4 consisting of screws 1 to 45 that follow 44, etc.
6, the cylinder 41 is fixed to one end of the screw rod 45.
Screws 1 to 48 slide inside, and a diaphragm 4 has one end fixed to the piston and the other end fixed inside the cylinder.
A direflam type pneumatic pump 37 consisting of 9 etc., a pressure sensor 38 which is attached to the cylinder 47 and detects the air n: in the cylinder 47 and converts it into an electric signal, (It is composed of a flexible air pipe 18 for feeding the ink tank 14 of the device 13, etc.).

As described above, the air compression system 42 having the above configuration detects the air pressure in the cylinder by the pressure sensor 38 and converts it into voltage, which is amplified by the feedback amplifier 39, sends an air pressure signal to the analog comparator 36, and similarly This is a negative feedback method that compares the converted recording speed signal with the recording speed signal.

In this pneumatic control mechanism, as shown in Fig. 5, the pressure control range necessary to obtain the amount of ejected ink corresponding to the 1σ recording method is practically sufficient within the width of 40 to 60 cm AQ culm; The amount of change in volume within the cylinder due to movement δV is less than 1/10 of the total volume V, which is sufficiently satisfactory.

Therefore, assuming the compression process, the cylinder volume before compression is Vl, the pressure is Pl, the cylinder volume after compression (bis.
Then, since the change in the state of the air inside the cylinder is thermodynamically a polytropic change (an intermediate change between isostatic change and adiabatic change), we have the following relationship: P+ V+ = P2V2k (1<k<i, 4) holds true.

KokoteV ) V 2-δV (δV<<V'1.)Solution for τP2 (), then P2='P+(1-δV, /V+ >;p+,
', x (1-+-K・δV/V+), and if the pressure change in the cylinder is δP=P2- P+, then δPzK
PI ・δV 1 Also, if the effective pressure-receiving area of the die 17 noram 49 is 1, δ V−8・δ is insufficient, and therefore, since KSP+/V+ is a constant, the cylinder pressure change δP can be approximated by Therefore, J- is linearly proportional to the piston stroke δ. Further, the detected pressure of the pressure sensor 38 and the output voltage are linear, and the shape of the cam 44 of the converter 46 is set so that the rotation angle of the pulse motor 43 and the piston stroke are linear, so that the The compression system 42 is composed of all linear components,
Extremely easy to control.

In addition, the entire system of this air pressure control device is installed outside the moving mechanism, and only pressure-controlled air is sent to the ink tank 14 through the air piping 18. In addition to being small and eave-shaped, it is not affected by disturbances caused by the movement of the recording head and can accurately control four recording heads. In particular, pressure sensors are easily affected by vibrations, so as shown in FIG.
A vibration-absorbing table 52 made of rubber or the like that further absorbs vibrations
It may also be installed on top of the control system to prevent disturbance to the control system due to vibration or the like.

Furthermore, the flexible air mixture 1 of the air compression system 42
8, the inner diameter should be as small as possible (1 to 2 mmΦ),
This is to ensure that the pneumatic control system is not affected. In other words,
When the inner diameter is large, the natural vibration of the air column, which is determined by the distance between the diaphragm inside the cylinder and the ink surface (approximately 3 to 5 m in the case of a large drawing machine), occurs on the ink surface, as shown by the solid line 1) in Figure 14. In response to the pressure acting on the ink tank, the air pressure displacement in the cylinder as shown by the solid line a in FIG. By making the inner diameter small, the influence of natural vibration is kept extremely small compared to the pressure displacement of pneumatic control.In this case,
As shown in FIG. 15, when a needle valve 53 is inserted between the cylinder 37 and the piping joint 54 to manually adjust the cross-sectional area of the air passage to adjust fluid resistance, it acts on the ink surface. The pressure waveform shown in FIG. 14 is as shown by the solid line C in FIG. 14, and no vibration occurs. This is 1. Taking advantage of the fact that the propagation waveform of air pressure is sensitively affected by changes in the fluid resistance of piping, etc., it is possible to eliminate undesirable pressure propagation vibrations by appropriately adjusting the needle valve.

Hereinafter, [Air 1 whose pressure is controlled by a noni-una pneumatic control device]
, 1 is sent by flexible air piping 18 to a reinkjet generator 13 shown in FIG.

The inkjet recording device of the present invention and the X-Y plotter equipped with this inkjet recording device have the following configurations and functions. By installing some additional or improved devices or circuits, etc., which will be described later, regarding the control and various parts of the system, it is possible to roughly expand the range of uses and improve the viscosity.

In the X-Y plotter device of the present invention, the pressure acting on the ink is controlled in response to the speed signal as described above, but by changing the reference pressure level for this pressure control, a single nozzle can be used to It can also be configured to record the line width of . Specifically, as shown in Fig. 16.17, this is achieved by varying the amplification gain of either the velocity signal V or the feedback pressure signal before inputting the signal to the comparator 36. . That is, in FIG. 16, the speed signal ■ is inputted to the positive phase amplifier 55. From the positive phase amplifier 551, the feedback resistors RX+ each have a different resistance value.
, RX2. It has RX3, switches SW+, S
It is designed to be used selectively by W2 and SW3. In this case, the voltage gain of the positive phase amplifier is (R + Rxn
) / 2 given by R, R'X1, RX2 . RX3
The voltage gain is determined by appropriately setting . ”
- Switch SW+, SW2. SW3 is selected by the gain selector 56, and the gain selector 56 operates an appropriate switch in response to an external signal Swd specifying the drawing line width. For example, if a thick drawing line is required, a switch is selected so that the gain of the positive-phase amplifier becomes large.

Then, the speed signal V is amplified from the actual speed and input to the comparator, and as a result, the pressure is also controlled to increase in response to the error.

When using a method in which the speed signal V is made variable and inputted to the comparator 36, the actual recording speed can also be scaled by the gain selector 56 according to the drawing line width specification and inputted to the comparator 36. That is, in the method shown in FIG. 16, the actual recording speed is not changed, but the gain of the speed signal is changed by the amplifier 55 and inputted to the comparator. Therefore, when a thick drawing line is required for a certain speed signal ■1, the comparator 3
The signal v2 inputted to 6 has the relationship (Vl < V2).

The actual recording speed at this time is assumed to be Vl. Next, try lowering the actual recording speed to V2 (V2 < Vl). At this point, the recorded Daruma signal is 2, which is returned to Vl by the amplifier and input to the comparator 36. In this case, since (V2 < Vl), the line width becomes thicker as described above. Based on the above, we get the following table.

FIG. 17 shows an example in which the voltage gain of the amplifier 51 that amplifies the feedback pressure signal is made variable to change the line width. This is the same as in the case of , but the difference is that when the thick picture ta, b < is requested, the voltage gain becomes smaller J:.

In addition, as shown in FIG. 18, in addition to the compression pump for controlling air pressure, an auxiliary pump 59 whose cylinder internal volume is controlled by another pulse motor 58 is installed in parallel with the compression pump 31. , connected by a pipe 93,
It can also be activated by a line width conversion signal. This J: 1. [When the line width designation signal shown in the above two examples is input, the auxiliary pump converts the air pressure in steps, and the air pressure control pump 37 changes the line width according to the recording speed. It can be used only for the original purpose of controlling the distance between the ejected inks to avoid the problem, and each air pressure can be controlled accurately and easily. This auxiliary pump 59 is connected to the cylinder 47 of the pneumatically controlled pump 37 by a pipe 93, and a rack is cut into the piston rod 96 for moving the piston 94 within the cylinder 95, and the piston rod 96 is connected to the rotation axis of the pulse motor 58. It is actuated directly by the installed pinion 97.

In addition, in the above example, four resistors with different resistance values, such as RX + , RX 2 , and RX a, are connected in parallel and selected to be used as the gain variable resistor. , this may be replaced with one variable resistor, and in this way the image line width can be changed continuously.

Further, the pressure control system 111M4f4 used in the inkjet recording apparatus of the present invention has a configuration as shown in FIG. In the control method, the pressure acting on the ink, that is, the control pressure is at a very low level (usually O~100c+
nAq) A highly sensitive 4f pressure sensor is required. For this reason, a pressure sensor using a semiconductor strain gauge or the like is used, but the temperature characteristics of this pressure sensor are very poor, and the output voltage is also low (about several tens of n+V), so a feedback amplifier with a high amplification is required. This quality special bamboo also has major problems and 4. Therefore, creating a negative feedback loop requires sophisticated technology and expensive components.

On the other hand, the X-Y cock device requires a relatively short operation time (for example, several minutes to several tens of minutes in the case of automatic drafting). The change is said to be less than a few degrees Celsius. Therefore, if we take this into account in an actual negative feedback loop, we can relatively easily prevent disturbances due to temperature changes, etc., as follows.

Figure 19 is a block diagram explaining the circuit system of A.
In the control circuit shown in the figure, an input gate 98 is inserted before the analog comparator 36, and the input gate 98 is inserted in the feedback loop. The amplifier 39 is a differential amplifier 39', an offset adjuster 99 is connected to the negative input side, a feedback gate 100 is inserted between the differential amplifier 39' and the analog comparator 36, and the output side of the differential amplifier 39' is The zero point detector 101 is connected to the zero point detector 101, and the output side of the zero point detector 101 is connected to the input gate 98
100, and the output of the former is supplied as the switching control signal of the latter. The output of the differential amplifier 39' in this control circuit is set to be zero when stopped at the H position. In addition, in order to confirm that the output of the differential amplifier 39' is zero, a pilot lamp or the like is activated by the zero point detector 101, etc. to display the result.

Next, to explain the operation of this circuit, when the device is stopped,
Even though the output of the air compressor, which is the controlled object 102, is zero, there is a drift in the output detector (pressure current) 103 and the differential amplifier 39', and the differential amplifier output is not zero. , the zero point detector 101 detects this and outputs a signal that connects the input gate 98 and the feedback loops 1 to 100 as shown in the figure, and then disconnects the input (meso field) and feedback loop and turns it off. ] 1.1, inform the operator of the state using the above-mentioned pi [1 trumpet, etc.] Note that in this state, the C pressure control system is stopped.

Upon receiving this information, the operator
9, when the negative input of the differential amplifier 39' is adjusted to make the output of the differential amplifier 39' zero, the zero point detector 10
1 detects this output level and turns on the input gate 1~ and the period gate, respectively input (target value) and differential amplifier 3.
At the same time as connecting to
Connect as shown and enter normal operating state. In this way, before the operation, the output of the controlled object is zero, and the output detector 1
Even if there is a drift in the differential amplifier 39 and the differential amplifier 39' and the output of the differential amplifier is not zero, the feedback signal can be easily made zero, allowing accurate control.

Fig. 20 shows a case where the method shown in Fig. 19 is applied to the pressure control system shown in Fig. 8, in which the input gate and the return jψ gate are operated using analog switches 104 and 105 operated by digital signals (TT level). , Offcella 1 - The regulator 99 is a positive input voltage follower with a manual potentiometer 106 connected to the terminal, and the zero point detector 101 has a window width of ±v1 volt (sufficiently small compared to the required control accuracy). Consists of comparators. Then the 8th
The operation will be explained in conjunction with FIGS. 43 and 19. First, when the X-Y plotter is operating at 1%, the air compressor cylinder communicates with the atmosphere through a normally open solenoid valve (not shown).Therefore, the input to the pressure sensor 38 is kept at zero. The X-Y plotter is ready.
ty If the solenoid valve is closed and the inside of the cylinder is airtight, and the output of the differential amplifier 39' is within ±v1polh, the window comparator 101 switches the ablog switch (input gate) 104 to the recording speed side, and A blog switch (
A signal is output to connect the feedback circuit 105 to the differential amplifier 39' to connect them, and the pressure control system immediately enters the operating state. However, there are temperature drifts in the pressure cylinder 38 and the differential amplifier 39', and the pressure cylinder (J-3
If the output of the differential amplifier 39' is more than ±V1 volt even though the input of 8 is zero, the zero point detector 101 detects this and connects each group 1 to the ground side as shown in the figure. Stop the pressure control system. This state is displayed on the pilot lamp, etc., so if this display appears, manually turn it off. Operate the potentiometer 106 connected to the regulator 99 to adjust the output of the differential amplifier 39' to v1pol1.
.about., connect as described above by the zero point detector 101, and start the pressure control system. By doing so, extremely precise pressure control can be achieved during the operation of the X-Y plotter. Therefore, when the operating time is relatively short (on the order of several tens of minutes), extremely accurate control is possible with a technically easy and inexpensive circuit configuration even if a pressure capacitor with poor temperature characteristics is used.

Furthermore, as mentioned above, when the surrounding tea juice, especially the temperature, changes, the physical properties of the ink change and Il! There is a problem that the ink quality changes, but this is mainly due to the fact that the viscosity of the ink is affected by temperature. In other words, it is generally known that the viscosity of ink, etc. decreases as the temperature rises, but the relationship between viscosity and ejected ink output is that, as shown in Figure 21, the ejected ink drop is inversely proportional to the viscosity. was observed. Therefore, even if a nozzle of the same size and the same ink are used, the voltage applied between the nozzle and the opposing electrode is constant, and the pressure acting on the ink surface is constant, the viscosity of the ink will be high if the ambient temperature is low. When the ink drop is small and the temperature is high, the viscosity is low and the amount of ink ejected increases. changes in proportion to. In order to prevent this, according to the present invention, it is also possible to provide means for guaranteeing the amount of ink to be ejected.

Figure 22 shows an inkjet generator equipped with temperature guarantee means, which utilizes the fact that the applied voltage and ejected ink level are in a simplified example relationship, and uses a high-voltage bias power source that can be varied by an external signal. Temperature detection uses a high-voltage bias power supply 30' with a voltage regulator to detect the temperature of the ink inside the ink tank 14 by transmitting an external signal to the voltage regulator. Vessel 1
08. For example, a signal converter 109 that can convert the output of a single no-mister to an electrical signal is used. The output voltage is increased to increase the amount of ink to be ejected, and when the first passage is high, the reverse operation is performed, and the output voltage is input to the high-voltage pulse generator 50.
3. In addition, if the plotting signal to the high-pressure pulse generator 50 is constant, it is possible to avoid ejecting a constant amount of ink regardless of the ambient temperature.

FIG. 23 shows an embodiment of another temperature guarantee means. Therefore, a depletion detector 108 for detecting the ink temperature and a signal converter 109 for converting the output into an electrical signal are used. , input the output signal of the signal exchanger 109 into the controller 40,
This output signal operates the controller 4o to change the bias level of the pressure control signal, and when the temperature is low, the bias level of the air pressure inside the ink tank generated by the air compression system 42 is increased, and the amount of ink jetted is increased. This system corrects the decrease in the amount of ejected ink due to a drop in temperature, and operates in the opposite direction when the temperature is high.The signal from the comparator 36 to the controller 40 is In this case, it is possible to eject a constant amount of ink regardless of humidity. The temperature guarantee means shown in A1, FIG. 22, J, and FIG. 23 may be used in combination. For example, the bias power supply 30 in FIG. 23 may be replaced with the voltage regulator example bias power supply 30 in FIG.
', and if this is controlled by the output of the signal converter 109, exactly the same effect can be obtained.

In this way, even if the viscosity of the C ink changes depending on the ambient temperature, the applied voltage or the pressure applied to the ink surface will not change.
Since the negative feedback increases, the amount of ejected ink is held constant, and an image line that always deviates to the right of the temperature by a constant width is obtained regardless of the temperature.

In addition, as mentioned above, the amount of ink jetted is affected by the pressure acting on the nozzle inlet, so when used for a long time, the hydrostatic pressure decreases, and (a) the amount of jetted ink is proportional to the recording speed. There is a problem in that (b) Geno 1-ON characteristics are extremely deteriorated. Regarding (a), the pressure acting on the ink surface is sufficiently larger than the hydrostatic pressure (ink hydrostatic pressure - several cmAq, pressure acting on the ink surface - several 10C)
IIIAq), so it's not much of a problem, but regarding (b), the pressure acting on the ink surface is always zero when h < ON, and the pressure acting on the ink surface is the pressure acting on the nozzle outlet. (atmospheric pressure), so the hydrostatic pressure has a direct effect.If the amount of ink in the tank is appropriate, as shown in Figure 24 a1 to a3, the The ink jetting starts from the moment a proper meniscus is created (81 in the same figure) and the switching voltage is applied (82 in the same figure),
After IISeC, a steady state is reached (Fig. 83), whereas when the amount of ink is small, as shown in Fig. 24 b1 to b3, a proper meniscus is not formed (Fig. 24 b1).
According to the present invention, there is a phenomenon in which the ejection does not start immediately even when a switching voltage is applied (b2 in the figure), or the ejection direction is bent away from the axial direction of the nozzle. It is also possible to provide hydrostatic pressure correction means to ensure that the pressure acting on the nozzle inlet remains constant at all times even if the ink ω decreases. In order to operate this hydrostatic pressure correction means, it is necessary to detect the hydrostatic pressure of the ink in the ink tank, but this is achieved by detecting the rotation angle of the pulse motor 43 in the pressure control mechanism. . This is because even if the recording speed signal is constant, when the amount of ink decreases (hydrostatic pressure decreases), the air volume in the ink tank increases, so a pressure proportional to the recording speed signal is applied to the ink surface. This is based on the fact that it is necessary to increase the rotation angle of the pulse motor in accordance with the decrease in hydrostatic pressure. In other words, 4299 of the present invention
The 121~ type recording device controls the pressure acting on the ink surface in accordance with the recording speed so that a constant width of recording lines can always be obtained by ejecting a drop of ink corresponding to the recording speed. Since it is at L, the pressure control mechanism.

This method takes advantage of the fact that the rotation angle of the pulse motor is proportional to the amount of decrease in hydrostatic pressure.

In addition, in the hydrostatic pressure detection method, the recording time is measured,
You may use this. However, in this case, the amount of ink to be ejected is large.

The hydrostatic pressure correction means described in I- is attached to the pulse motor 43.
a potentiometer 110 that detects the rotation angle of the potentiometer 110, a peak value hold circuit 111 that detects and holds the peak value of the potentiometer 110, an inverting amplifier 112 that amplifies the output by one shift, and an output of the inverting amplifier 112. It consists of a level shift circuit 113, the output of which is applied to an analog comparator 36.

The level shift circuit 113 is a positive phase amplifier (voltage gain -1
), the output voltage level of which is shifted by the output from the inverting amplifier 112. Pulse motor 43
Since it is sufficient to detect the value corresponding to the recording speed signal which is the base t% of the rotation angle, the embodiment shown in FIG. 25 uses the maximum recording speed signal which is one step higher than the maximum recording speed as the reference. This is because in an XY plotter, the maximum recording speed of one word is usually constant.

Next, this operation will be explained. First, when the ink hydrostatic pressure is at a specified value, the level shift circuit 113 passes the maximum recording method 1α signal as it is and avoids rotating the pulse motor 43, and the potentiometer 110 detects the rotation angle and outputs the signal. A peak value hold circuit 111 detects and holds the output of the inverting amplifier 112 and inputs it to the negative side of a level shift circuit 113. At this time, the output of the inverting amplifier 112 is zero (
The output voltage of the potentiometer 110 is set so as to be at ground potential). Next, when the hydrostatic pressure decreases due to recording, the rotation angle of the pulse motor 43 increases with respect to the maximum recording speed signal as described above, and the output of the potentiometer 110 becomes jerky and the peak value is held. The output of the circuit 111 increases, the output level of the inverting amplifier 112 moves to the negative side, and the output changes from level shift 1 to circuit 11.
It can be placed in 3. The level shift circuit 113 changes its output to the positive side by this input.
3, the output of the potentiometer 110 increases further 9
Act in the direction of cover. Therefore, positive feedback is applied to the side of the pressure control Ia, and the position where the pulse motor stops is determined by the relationship with the negative feedback loop consisting of the pressure sensor +J38 and the feedback amplifier 39.

Positive return i! The gains of the loop and the negative feedback loop can be determined by experiment. However, since the rate of decrease of ink in the ink tank is extremely slow, the frequency characteristics of the positive feedback loop, that is, its interruption and It is preferable to suppress the wave number to 11-12 or less. In this embodiment, the direct current bias of the recording speed signal is modulated by the rotation angle e of the pulse motor 43 that indirectly detects the amount of ink reduction in the ink tank to generate the hydrostatic pressure. Although correction is performed, it can also be done by using the recording time as described later.Also, when the ink level has fallen to the limit of the nozzle entrance and it is impossible to continue recording, it can be Detected at the maximum rotation angle overnight, a warning signal 3a is sent from the peak value hold circuit.
A warning device is installed to issue a warning.

In addition, as shown in FIG. 26, the feedback amplifier 9 shown in FIG. The output of the peak value hold circuit 111 may be amplified by the positive phase amplifier 114 and the output voltage thereof may be input to the input side.In this case as well, when the ink hydrostatic pressure is a specified value, the positive phase amplifier 114 is amplified by the positive phase amplifier 114. The output of the pressure sensor 114 is set to zero (ground potential), and the output J of the pressure sensor is directly amplified by the differential amplifier 39' and input to the analog comparator 36. However, when the hydrostatic pressure decreases, the output of the peak value hold circuit 111 increases, the output level of the positive phase amplifier 114 shifts to the positive side, and this becomes an inverted input to the differential amplifier, so the overall level of the output of the pressure sensor 9 decreases, resulting in the embodiment shown in FIG. Similar effects can be obtained by adjusting the pulse motor 43 in the direction of increasing the output of the potentiometer 10 in step 1-1.

Roughly speaking, as shown in FIG. 2.gamma., the output level of the level shift circuit 113 in FIG. 25 can be shifted by i.times. in recording time. This is suitable for X-Y plotters where the jetting of ink is relatively constant. The configuration and operation of A will be explained below. First, when the output of the t11l path 117 is set to zero with a specified amount of ink in the ink tank, the output from the n/A converter 118 that has been converted to 1]/A. and the output of the inverting amplifier 112 become zero (ground potential), and the recording speed signal (pressure control signal) is input to the analog comparator 36 without being level shifted. Next, when the plotting command signal S[I is input, as described above, during this time JTS1~ is monitored and the hydrostatic pressure becomes low.

Therefore, when the distance between ejected inks is constant, the decrease in hydrostatic pressure is proportional to the time during which the drawing command signal is applied. t with 1 to 116 and 4 number circuit 117
1 side, the output level of the level git circuit 113 is set to the positive side by the output signal of the tI number circuit 117 via the 1]/A converter 118 and the inverting amplifier 112, and pulsed to 43. Adjust to increase the air pressure inside the ink tank. In this case, the warning signal 3a is generated from the four-number circuit 117. In this embodiment, various clock pulse generators, counting circuits, etc. can be used, but for example, the clock pulse frequency is 0.1l-1z, the counting circuit and D
/ The number of bits of the A converter is 12 bits 1~.

When configured as shown in FIGS. 25 to 27, the amount of ink in the ink tank decreases and the ink surface drops to the point where the nozzle entrance is misaligned, and the jet continues until it becomes impossible to eject any more jets. It is possible to perform the ON operation extremely normally, to make the amount of injected ink accurately proportional to the recording speed, and to use the replenished ink effectively, thus making it possible to record for a long time. The recording time varies by J between the volume of the ink tank and the amount of ink jetted per unit of ink, but for example, using ink with a ratio of 10.9, the ink tank capacity is 5 pulses, and the jetted ink is Q0.4 + ng.
/sec, at a recording speed of 20m/min, one ink replenishment will print approximately 3 lines, and the print length will be approximately -C/Ik■
continuous recording is possible.

In addition to the above-mentioned correction means for ink reduction, when the air compressor is operated for a period of time, the heat generated from the mechanical system such as the pulse motor and the friction between the air and the cylinder wall is transferred to the air inside the cylinder by conduction. It is also reportedly possible to install means to insure against the effects of changes in air pressure due to temperature rises1, in which case:
As shown in FIG. 28, in addition to the configuration shown in FIG. 25, a temperature sensor is installed on the positive input side of the inverting amplifier 112 so as to supply the temperature of the air in the cylinder to the air compressor 37. υ 119 (such as a thermistor), a signal converter 120 that converts its output into an electric signal proportional to temperature, and an inverting amplifier 121 that inverts and amplifies the output, and the amplified output is connected. Next, this operation will be explained. First, when the ink hydrostatic pressure and the cylinder internal air temperature 1α are within the specified range, the level shift circuit 113 outputs the maximum recording signal Vll1.
The pulse motor 43 is rotated by passing the ax as it is, and the output of the potentiometer 110 is detected at the peak (111). The output potential of the potentiometer 110 and the output of the inverting amplifier 121 are set so that the output of the inverting amplifier 112 becomes zero (ground potential).Next, by recording, the hydrostatic pressure decreases. As explained above,
With respect to the maximum recording signal VmaX, the rotation angle of the pulse motor 43 increases, the output of the potentiometer 110 becomes larger, the output of the peak value hold circuit 111 increases, and the output level of the inverting amplifier 112 shifts to the negative side. The signal is moved and input to the level shift circuit 113. Level shift] - The circuit 113 shifts its output to the positive side by this input.
...and the pulse motor 43 is further connected to the potentiometer 110.
acts in the direction of increasing the output. That is, positive feedback is applied, and the stopping position is determined by the relationship with the negative feedback loop (pressure sensor, feedback amplifier). The gains of the positive and negative feedback loops are determined experimentally. Furthermore, since the rate of decrease of the ink in the ink tank is extremely slow, it is preferable that the frequency characteristics of the positive feedback loop, that is, the cutoff frequency, be kept below 1H7. Next, if the temperature of the air in the cylinder fluctuates (generally, it will rise due to the above reasons), and if there is no temperature detection system that includes an inversion increase, for example, the temperature of the air in the cylinder will rise. In this case, for the same rotation angle of the pulse motor 43, the air pressure inside the air compressor will rise and the pressure will be detected! Due to the action of the loop, the rotation angle of the pulse motor 43 is reduced, and the output of the inverting amplifier 112 is affected by the temperature and no longer operates normally. Inverting amplifier 121
The temperature detection system including the temperature detection system operates to ensure this.

That is, when the air in the cylinder > i Jr If h < exceeds the specified value, the rotation angle of the pulse motor 43 is
The output level of the inverting amplifier 112 decreases due to the action of the negative feedback loop described above, but the output level of the temperature detection system, that is, the inverting amplifier 121 decreases, decreasing the output level of the inverting amplifier 112. The negative input sides of the level shift circuits 1 to 113 are prevented from fluctuations due to temperature changes in the air pressure in the cylinder, and the ink in the ink tank is normally reduced. It acts to correct only the amount. Furthermore, in this embodiment, when the ink level drops to the very edge of the nozzle inlet and it becomes impossible to continue printing, the detection is made at a rotation angle of 43 (maximum), and a warning signal Sa is generated by the output of the inverting amplifier 112 to notify the operator. It has a warning device that tells you to replenish the ink.

Moreover, FIG. 29 shows a case where temperature correction is added to the circuit of FIG. 26, and the inverting amplifier, 121 (7? The output of circuit 111 is temperature-proof.

The operation of this temperature correction means is carried out in the same manner as in the case of FIG.

Therefore, in the case of FIGS. 28 and 29, in addition to being able to record over a length of 1, even if pressure fluctuations occur in the air in the cylinder due to temperature fluctuations, the same Even if the rotation angle of the pulse motor changes with respect to the recording speed, the recording speed signal level or negative feedback signal level is shifted to the correction side, that is, the direction that increases the output of the potentiometer, without being affected by it. Therefore, the above fluctuations are corrected, and the pressure acting on the ink surface can be controlled more accurately in response to the recording speed signal.

As mentioned above, when an inkjet generator is applied to a recording head such as an X-Y plotter, the ink surface shakes due to the acceleration during movement, the hydrostatic pressure of the ink applied to the nozzle changes, and the recording speed remains constant. However, there are problems such as variations in the width of the ink and uneven print width, but according to the present invention, these problems can be solved by stabilizing the liquid level in the ink tank, as shown in Figure 30. This can be solved by installing the parts.

In FIG. 30a, a metal or plastic fiber is used as a liquid level stabilizing member, and a suitable number of fibers 1t122 are loaded into the ink tank 14 and ink is soaked into it. In this case, it receives an acceleration of approximately 2G [)
However, almost no liquid shaking occurred.

Figure 30 11 shows a stack of metal 115123.
1 is loaded into the ink tank 14, and the ink is filled with the upper level of the net 123. In this case, even when the ink is subjected to an acceleration of about 2G, there is almost no liquid shaking. It never happened.

In Fig. 30C, a plurality of metal nets 123 are placed in the ink tank 14 at certain intervals to fill ink, and the liquid hardly sways even when subjected to an acceleration of about 2G. It did not occur.

In the case of the embodiment shown in FIGS. 30a-30C, the liquid level stabilizing member functions as an ink filter, so that clogging of the nozzle 15 hole due to foreign matter can be prevented.

FIG. 30d shows a disc-shaped float N1 made of a material having a specific gravity lower than that of the ink, such as foamed polyethylene and cork, on the surface of the ink in the ink tank 14 as a liquid level stabilizing member.
24 floating, and in this case also about 2G
Even when subjected to an acceleration of , almost no liquid shaking occurred.

By providing the liquid level stabilizing member in the ink tank as described above, liquid shaking is prevented when the inkjet generator jets the diene]~ while receiving acceleration in the direction of the TI4I4 surface direction angle of the diene 1~. This allows for stable jetting, and also prevents ink from staining the ink stains caused by ink, making maintenance easier.

In addition, a number board 20 for the X2Y plotter according to the present invention is provided.
It is preferable to use a conductive material. This is due to the following J: Una reason. Since the inkjet ejected from the electric field ejection type inkjet generator is a high-speed, minute array of charged particles, if the electrically insulating drawing board 20 is used, the recording material 21 may be made of a highly insulating material (for example, polyester). When the recording material 21 is made of a synthetic resin such as a film, the charges carried by the preceding particles are locally accumulated on the recording material 21, and this repels the charges of the subsequent particles, causing the subsequent particles to move onto the recording material. Particles that are scattered or subjected to a larger repulsion force have nowhere to go and are swept towards the annular counter electrode (which is grounded), contaminating its surface considerably. Even if there is, since it is not grounded, the charge carried by the particles accumulates over time and its surface potential increases, which is detrimental to the jetting of the diene as in the case of insulating recording materials.

This is because it has an impact. This negative effect is due to the fact that the drawing board is made conductive, its potential equal to or lower than that of the annular counter electrode, which prevents the recording material from being charged by the charge carried by the preceding jet. This can be prevented by restraining the electric lines of force generated from the carried ink so that they do not flow toward the annular counter electrode, but toward the drawing board.

There are various methods of imparting conductivity 11 to the drawing board, but in order to allow the use of conventional contact recording tools, we have developed a method that does not impair the elasticity of the conventional drawing board. A method that imparts electrical conductivity is preferred.

This can be achieved by, for example, embedding or pasting a metal plate or mesh-like metal wire in a sheet of the same material as the conventional drawing board, or by embedding or pasting a metal plate or a mesh-like metal wire into a sheet of the same material as the conventional drawing board. This can be accomplished by adding, dispersing, and then molding a fine powder.

The drawing board 20 shown in FIG. 31a consists of two rubber sheets 125.
A conductive member 126 made of a mesh-like metal wire, for example, iron wire, copper wire, nichrome wire, etc., is sandwiched between them, and both parts are fixed with an adhesive or the like. Nichrome wire was used as the metal wire. In this case, when a current is passed through this, the drawing board is heated by Gill heat, which raises the temperature of the recorded object, heats the ink on the recorded object, and shortens its drying time. There are advantages.

The drawing board 20 shown in Fig. 31 is made by adding and dispersing conductive fine powder such as carbon or silver to an extent that does not impair its elasticity to the same rubber as the conventional rubber drawing board. It is molded to predetermined dimensions after being subjected to conductive treatment. In this case, it is desirable that the specific resistance is 10 5 Ω·am or less.

The drawing board 20 in Fig. 31C is made of the same material as the conventional drawing board, ie, an insulating I11 sheet 125 (Fig. 311).
A conductive sheet i~127 that has been subjected to conductive treatment in the same manner as the drawing board is attached. Transfer this drawing board to the X-Y plotter.
If you do,! ! Attach the non-conductively treated surface at an angle of 1° with the surface facing the insulation 111 sheet facing the nozzle (U). Generally speaking, if conductive fine powder is dispersed in rubber,
Since there are cases where it is desired that the color of the X-Y plotter board be as white as possible, the board shown in FIG. 31C is effective in such cases.

When using a drawing board configured as described above, for example, as shown in FIG. 16, or as shown in the figure, one end of the conductive member 126 is grounded and the potential of the annular counter electrode 44i1G is raised to the ground potential J:, and the other end of the conductive member 126 is grounded. Connect heating power #Ip, w.

In the latter case, in order to prevent the electrical potential of the conductive member connected to the heating power source from having an adverse effect on the jet, the voltage of the power source is preferably 50 V or less. In addition,
The devices shown in FIGS. 31 and 31c can also be used in the same manner.

By using this J:Ui "diagram board, the electric charge carried by the preceding jet and accumulated on the recording medium can be
The quality of the image is significantly improved without adversely affecting the generation of jets or subsequent jets.■ By heating the drawing board, the ink adhering to the recording medium dries more quickly.■
Even when using a conventional contact-type brush handling tool, effects such as being able to be shared without any problems can be obtained.

As explained above, in the inkjet recording apparatus according to the present invention, the inkjet generating apparatus is provided with a pressure control means for controlling the pressure acting on the ink surface in the ink tank in response to consecutive recording failures. With this, the control of the ink jet QJ f3 corresponding to the recording speed can be controlled very precisely.
f, and its response is extremely good, and X-
Even if the recording speed changes due to Y movement, the recording line width can be kept constant at all times, and high-speed recording can be performed without any inconvenience.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an X-Y printer equipped with an inkjet recording device according to the present invention, FIG. 2a is a plan view of an inkjet printer, and FIG. Front view, Figure 2C is a sectional view taken along the line I-T in Figure 2, Figure 3a is a plan view of the head body, and Figure 31) is a cross-section of the infusiera 1 to the starting part. 3C is a sectional view of the head body, FIG. 3D is a plan view of the lower head body, FIG. 3E is an enlarged sectional view of the vicinity of the nozzle, and FIG. 3F is a bottom view of the counter electrode.
Figure 4 shows how the onkjet generating part is attached to the head body. 6 is a graph showing the relationship between the amount of ejected ink and the line width of the recorded image, FIG. 7 is a block diagram of the servo control AL1 mechanism, and FIG. 8 is the recording speed according to the pressure control mechanism. A block diagram of the signal generation mechanism, Fig. 9 is a block diagram of the pressure control mechanism, Fig. 10 is a diagram showing the operation timing of the pressure control mechanism in Fig. M9, and Fig. 11 is the state of Infusiella I when the jet is OFF-OFF. FIG. 12a is a schematic diagram showing the air compression system in the pressure control mechanism of FIG.
Figure 2 is a sectional view taken along line A-A in Figure 12a, Figure 13.
The figure is a partial cross-sectional view taken along line B-B in Figure 12a.
Figure 4 is a graph showing pressure waveforms in the compressor and ink tank, Figure 15 is a sectional view of main parts showing a modified example of the compressor,
Figures 16 and 17 show modified examples of the pressure control mechanism.
Block diagram, Fig. 18a is a plan view showing a modification of the air compression system included in the pressure control mechanism, Fig. 18 is Fig. 1b.
19 is a block diagram of a pressure control mechanism equipped with a disturbance prevention circuit, FIG. 20 is a circuit showing a specific example thereof, and FIG. 21 is a sectional view taken along line I-I in Figure a. Figures 22 and 23 are graphs showing the relationship between temperature guarantee means (but Figure 21!1 is a block diagram showing the equipment of an inkjet recording device) and Figures 22 and 23 are graphs showing the relationship between Figure 25 is a schematic diagram showing the J effect, Figure 27 is a block diagram showing the main part of the n'-force control structure equipped with a hydrostatic pressure correction means, and Figures 28 and 29 are hydrostatic pressure correction. Pressure control 11 with means and pressure guarantee means
Block diagram showing the main parts of the pressure control mechanism equipped with
Figures 0 a to d are cross-sectional views showing various examples of inkjet generators with stepped liquid level stabilizing members, Figures 31 a to C are cross-sectional views of various drawing boards, and Figure 32 shows how they are used. FIG. 1...X-Y plotter, 2...Main body, 3.4...
Rail, 5...X-moving girder, 6.7... Support stand, 8
...X-servo motor, 9...Y direction rail, 10
... Mover, 11... Servo motor, 12... Head main body, 13... Inkjet generator, 14.
... Ink tank, 15 ... Nozzle, 16 ...
Counter electrode, 18... Air piping, 19... High voltage cable, 20... Drawing board, 21... Recorded object, 22.31
...Interface, 23.23'...Comparator,
24.24'...D/A converter, 25.25' 4f
- Bo amplifier, 26. 26' ... speed detector, 27.
27'...Position detector, 28.28'...Feedback amplifier, 29.29'...A/D converter, 30...Bias power supply, 32.33...Squaring circuit, 34... ... crimping circuit, 35 ... square root circuit, 36 ... analog comparator, 37 ... compressor, 38 ... pressure lens, 39
... Feedback amplifier, 40... Controller, 41... Pulse motor drive circuit, 42... Air compression system, 43...
Pulse [-ta, 44... cam, 46... converter, 4
7... Cylinder, 48... Piston, 50... High pressure pulse generator, 53... Needle valve, 55.57.
...Amplifier, 56...Gain reflector, 58...Pulse motor, 59...Auxiliary pump, 61...Positioning bin, 62...Nozzle fixing barrel, 63...Nozzle guide ring, 64...・Outer cylinder, 65...0 ring, 66
... Annular hole, 67... Notch, 68.69... Annular vortex, 70... Annular hole, 11... Notch groove, 72...
- Ink tank fixing ring, 78... High voltage electrode ring, 79... High voltage electrode contact piece, 80... Connector, 81
゜84...Lead wire, 82...Counter electrode ring, 8
3... Counter electrode contact piece, 86... Lid, 87... Loupe for jet observation, 94... Piston, 95... Cylinder, 96... Piston rod, 97... Pinion,
98...Input gate, 99...Offset adjuster,
100... return;! Goo 1~. 101... Zero point detector, 102... Controlled object, 103... Output detector,
104.105.../su1] Gusuichi, io6,1
i, o... Potentiometer, 108... Furniture detector, 109... Signal converter, 11... Peak vessel ho! Lead circuit, 112, 121... Inverting amplifier, 113
... Level shift circuit, 114 ... Positive phase amplifier, 1
15...Clock pulse generator, 116...AN
l') Gate, 117...R1 number circuit, 118...
・D/A converter, 119...Temperature lens 1, 12
0...Signal converter, 122, 123, 124...Liquid level stabilizing member, 125...Insulating sea i., 127.
...Conductive sheet. Patent applicant Minolta Camera Co., Ltd. Agent
Person Patent attorney Aobai Ao and 2 others Figure 3
Fig. 3 (e) (f) Fig. 4 (c) Fig. 5 Fig. 6 ) Figure 15 Figure 16 Figure 17 Cause Figure 19 Figure 20 Figure 21 Ink control C, P 1 Figure 22 Figure 23 Figure 24

Claims (1)

[Scope of Claims] (1) In an inkjet recording device in which a recording head and an ink tank move integrally, a liquid level stabilizing member is provided in the ink tank to prevent fluctuations in the ink liquid level. An inkjet recording device characterized by: <2) A recording device of Patent No. 99111~ type, characterized in that a nozzle is provided at the bottom of the ink tank, and a counter electrode is arranged in the vicinity of the nozzle, and these move as a unit as a recording head. (3) The in-99171-type recording device according to claim 1 or 2, wherein the liquid level stabilizing unit {A is a lillilt loaded in an ink tank. (4) The inkjet type (5>l-2) according to claim 1 or 2, wherein the liquid level stabilizing member is a layered metal net. The in-99111-type recording device according to claim 11b or 2, wherein the liquid level stabilizing member is a metal mesh arranged at predetermined intervals. (6) The above-mentioned 1. The inkjet recording apparatus according to item 1 or 2 of the scope of Patent No. 8, wherein the liquid level stabilizing member is a floating lid made of a material having a specific gravity smaller than that of the ink.