SU1314228A1 - Ink jet recording device - Google Patents

Description

2. The device of claim 1, wherein the control and synchronization unit comprises serially connected column register, switch, driver, point recording amplifier, serially connected counter, memory control, ready trigger, recording trigger points, the second driver and recording point amplifier, serially connected counter, first OR circuit, account control trigger and connected to the corresponding inputs of the account control trigger, first and second AND circuits, connected in series three a column sweep generator, a tuning fork trigger and a tuning fork amplifier, the outputs of the first and second AND circuits are connected to the counter inputs, one of the inputs of the first OR circuit is connected to the trigger input of the column sweep and one of the counter outputs, the invention relates to computing and is connected It can also be used to record bitmaps in output devices of computers, electronic teletypes and facsimile machines.

Inkjet inkjet recorders are known which allow the diverging of ink droplets to flow within a vertical column or sign micropastern in order to form a raster image of alphanumeric and graphic information on common paper grades, for example, a ink jet head with a continuous emission of droplet paper is used in a known device. jets, the drops of which can be charged to different potentials from O to 200 V, then when flying to the paper through the deflector (a pair of vertical plates)., which is filed on the constant high voltage-charged each drop is deflected at a certain angle, thus osuschestz- l vertical single any column mark. Unintended control gtami output is connected to the input of the inverter, the output of which is connected to one of the inputs of the switch, the input of the inverter is connected to 2 ONE OF THE INPUTS of the second circuit, or the output of which is connected to one of the inputs of the register, the fourth output of the control memory is connected to the second the control trigger input of the tuning fork whose second output is connected to the second input of the tuning fork amplifier, the output of the first shaping device is connected to the second input of the second shaping device, the third output of the control memory is connected to one of the trigger input records and points to the ready trigger, the output of which is connected to the first inputs of the first and second I-NOT circuits, whose outputs are connected to the corresponding inputs of the register, the second inputs of the first and second I-NOT circuits are connected respectively to the first and second outputs of the trigger sweep.

The droplets, flying along a straight path, enter the drip catcher and return to the ink tank. After printing a different column, the head with baffle moves one step to print the next column, and so on.

The disadvantages of these devices are low operational reliability due to the high voltage on the deflector plates, the need for special ink, and the complexity of the design.

The closest to the invention with the technical essence and the achieved result is an inkjet recording device containing a writing unit connected to an ink reservoir, a deflector with an electromagnetic vibration exciter, a recording medium, a control and synchronization unit connected to the writing unit and a deflector .

This device has the following features:

disadvantages: constructive complexity of the device, including the pump, filter, two deflectors, constructive

the complexity of the first deflector, containing an electromagnetic system along whose axis the ink pipeline passes, the need for special ink to charge the formed drop, the print quality deterioration due to nonlinear distortions in the oscillatory system of the first defletor.

The purpose of the invention is to simplify the device, increasing its reliability and recording quality.

This goal is achieved by the fact that a speed sensor is inserted into an ink jet recording device containing a writing unit connected to an ink reservoir, a deflector with an electromagnetic vibration exciter, a recording medium, a control and timing unit connected to a writing node and a deflector. the writing unit and the deflector are used, respectively, a pulsed ink-writing head and a tuning fork chromatic deflector, and the writing head is fixed on the first branch of the tuning fork, and on the second branch oscillation exciter is fixed, the mobile part of which is connected to the first branch of the fork draft type, the movable portion of the speed sensor is fixed to the first leg and is fixed - in the second branch of the fork. The control and synchronization unit contains serially connected column register, switch, driver point recording amplifier, serially connected counter, control memory, ready trigger, point recording trigger, second driver and point recording amplifier, serially connected counter, first OR circuit, control trigger account and

connected to the corresponding inputs

the first and second circuits control trigger AND, sequentially connected column sweep trigger, tuning fork trigger and tuning fork amplifier, the outputs of the first, second and second circuits AND are connected to the counter input, one of the inputs of the first OR circuit is connected to the trigger of the column sweep and with one of the outputs of the counter, the first output of the control memory is connected to the input of the inverter, the output of which is connected to one of the inputs of the switch, the input of the inverter is connected to one of the inputs

0

five

five

five

five

the second circuit. or, the output of which is connected to one of the register inputs, the fourth output of the control memory is connected to the second input of the tuning fork control, the second output of which is connected to the second input of the tuning fork amplifier, the output of the first imager is connected to the second input of the second imager, the third output the control memory of the PC / SC. one of the inputs of the trigger for recording points and the ready trigger, the output of which is connected to the first inputs of the first and second AND –N schemes, the outputs of which are connected to the corresponding inputs of the register and, second inputs of first and second NAND gates respectively connected to first and second outputs of scan flip-flop.

FIG. 1 shows schematically the recording device j in FIG. 2 is a control block diagram; in fig. 3 is a plot of droplet deviation versus velocity; in FIG. 4 is the control programming table of FIG. 5; time diagram of the operation of the control unit.

The recording ink device contains a pulsed ink head 1, a tuning fork chromatic deflector 2, a device 3 for adjusting the chromatic deflector, a causative agent for 4 tuning forks, pull 5, a magnetic system 6 for vibrating branches of the tuning fork, coil 7 for the sensor, ink conduit 8, ink reservoir 9 5i, the recording medium 10, the control unit 11.

The control unit contains AND 12, 13 circuits, a synchronization counter 14, an account control trigger 15, an OR circuit 16, a control memory 17, a column sweep trigger 18, a trigger

19 tuning fork amplifier

20 tuning fork trigger

21 readiness, trigger recording 22 points, AND-NOT circuit 23, 24, column register 25, circuit OR 26, inverter 27, switch 28, drivers 29, 30, recording amplifier 31. The inputs of the circuit 12, 13 receive an external synchronization signal from the SI-1 computer, as well as signals from the outputs of the account management trigger 15. The outputs of the circuits And 12, 13 are connected to the counting inputs of the synchronization counter 14. The outputs of the bits

: eight counter single 14 sync | nization connected to control inputs

51

17, and the transfer signals arrive at the inputs of the OR 16 circuit and trigger 18 sweep the column. The transfer control input trigger input 15 receives transfer signals from counter 14 and the synchronization signal of the SI 1, the outputs of the control memory 17 are connected to the outputs of the counter 14 and the synchronization signal of the SI 1, and the outputs of the control memory are connected to the inputs of the readiness trigger 21, the trigger 22 point recordings, the tuning fork trigger 19 and, via the inverter 21, to the inputs of the switch 28. The outputs of the trigger 18 trigger of the column are connected to the inputs of the trigger 19 controlling the tuning fork TI of the commutator 28, The outputs of the trigger 19 controlling the tuning fork of the plug A tuning fork. The output of the tuning fork excitation 20 is connected to the winding of the 4 tuning fork oscillations (FIG. 2). The inputs of the ready availability trigger 2 are connected to the outputs of the control memory 17, and its outputs are connected to the trigger entry input 22 of the point recording and 1 enters the computer as a ready signal to receive a maligned column in the register. The inputs of the trigger 22 for recording points are received from the trigger 21 and the control memory 17, and its outputs are connected to the inputs of the drivers 29, 30. The inputs of the circuit

40

IS-23, 24 receives signals from above-35 and recordings of the column code, the computer issues a control 17, a readiness trigger 21, a trng generator 18, a column sweep, and the outputs of the AND-HE circuits 23, 24 are connected to the registers The 25th column, to the inputs of which comes from a computer, the 15th bit code of the column (the presence of 1 in the corresponding section is an indicator of the need to record a point in the column on the main memory), the signal of the record, the code from the computer, and information shift signals in the register from the outputs of the circuits 23, 24; The outputs of the register are connected to the inputs of the switch 28, to the inputs of which cheny register outputs 25j, controlled liters guide the memory 17, the trigger 21 is ready. The switch 28 performs the time selection (synchronization) of the pulses of recording points coming from its output to the inputs of the drivers 29, 30, which form the signals for recording points by duration and phase.

50

55

c from the control unit signal Ready.

When the device is switched on, a continuous excitation signal is sent from the control unit to the winding of the 4 tuning fork oscillations (a polarized relay, which is connected to the thrust stage 5), acts as the exciter.

The tuning fork goes into an oscillatory mode at its own frequency, and the exciter through tu 5 maintains a continuous oscillation mode, which controls the amplitude — which is produced from the oscillation sensor of the tuning fork branches 7. Since the tuning fork has a well-defined resonator quality, the mechanic oscillator1 -1 vibrations at its own frequency, the adjustment to the set value of the natural frequency of the tuning fork is carried out

The outputs of the forg-shrowers are connected to the inputs of the recording amplifier 31, which is connected to the input of the writing ink head 1 (FIG. 2).

There are no fluctuations in the u-tuning fork statistics.

The tuning fork switches to the continuous oscillation mode at the natural frequency only when the external synchronization pulses of the SI-1 are fed from the computer, on which the counter begins to work, the tuning fork control circuit 19, 20, and the output is generated

a sequence of signals from the control memory 17 is needed. The ready trigger 21 puts the ready signal on the corresponding clock cycles, according to which the device is ready to receive the next column code in register 25.

Due to the fact that the dot print diameter on paper is 0.2 mm and the maximum height of capital letters is 3.2 mm, the register is 15 columns of discharge, and the number of printed dots in one column is recorded by writing the same number 1 in the register from the computer.

The mutual arrangement of points in the column is provided by writing 1 to the corresponding register bits.

In addition, an external synchronization signal to the control unit is received from the computer, the print resolution signal

and writing the column code in the computer issues

c from the control unit signal Ready.

When the device is switched on, a continuous excitation signal is sent from the control unit to the winding of the 4 tuning fork oscillations (a polarized relay, which is connected to the thrust stage 5), acts as the exciter.

The tuning fork goes into an oscillatory mode at its own frequency, and the exciter through tu 5 maintains a continuous oscillation mode, which controls the amplitude — which is produced from the oscillation sensor of the tuning fork branches 7. Since the tuning fork has a well-defined resonator quality, the mechanic oscillator1 -1 vibrations at its own frequency, the adjustment to the set value of the natural frequency of the tuning fork is carried out

7

Using ycTpopicTBa, adjust the chromicity of the deflector 3, which consists of two weights - nuts (a nut and a lock nut) that are moved during adjustment on the threaded rod. Moving the weight to the support of the tuning fork increases the frequency of its oscillations, moving the weights from the support decreases the frequency.

Since a writing ink head is fixed on one branch of the tuning fork, due to its oscillations relative to the paper, a vertical scan of one character column is carried out.

Each point is printed when applying to the head .1 from the control unit a recording signal that ejects a drop of ink into the atmosphere, and after its collision with paper 10, the image of the point is fixed on the carrier.

In addition to their velocity V in the direction of the injection, the droplets emanating from the oscillating writing head also acquire an instantaneous velocity V of the oscillatory movement of the head in the direction perpendicular to the direction of injection. As a result, each drop flies toward the paper in the direction coinciding with the direction of the resultant velocity vector, obtained after geometrically adding the injection velocity v, and the instantaneous oscillatory velocity v,. The speed of the vibrational -movement v is proportional to the amplitude and frequency of the oscillations.

When the ink droplet flies from the head to the paper, the following occurs as a result of the QT timing of the droplet ejection with the corresponding oscillating tuning fork:

the maximum deviation of the droplet from the NIL upwards from the horizontal flight path in the event of its ejection at the maximum head velocity upward;

maximum deviation of the ink drop down from the horizontal flight path in the event of its ejection at the maximum head speed downward;

. preservation of the horizontal trajectory of the droplet in the event of its ejection at the minimum speed of the head (pr change of speed sign)

any deviation of the drops up or down from the horizontal trajectory along

summer in the event of droplets being ejected into other intermediate phases of the head velocity.

The graphs of the dependence of the deviation of the droplets on the velocities and in Figs. 3

If the speed of the droplet is v, (mm / s), the instantaneous speed of the head V, (mm / s), the distance between the nozzle and paper is 1 (mm), the height of the sweep of the column is h (mm), dia-. recording point d (mm), working speed p (points / s), number of points in the recording column ha (points), head speed along the record line v (mm / s), head amplitude (tuning fork) A. (MI -I), these values are related by the following dependencies:

v d-.n (mm / s) 5 V.J

d; n m

(mm / s)

25

f - (1 / s) -, m

BUT

- 0; 2-15

(one

0525 (mm) ..

If it is necessary to record a combination of points in a column, recording pulses arrive at the writing head, the number of which exactly corresponds to the number of points in the column, and the time for applying each pulse is strictly synchronized from the recording control unit.

The offset of the recording point up or down from the initial position is due to oscillations of the tuning fork with the following relationship:

Е С

ot + cf arcsin-pr

where cot is the phase of oscillations of the tuning fork-, C) is the constant phase shift determined by the design parameters of the tuning fork and the parameters of the writing head K is the deviation of the recording point from

initial position; C - constant tuning fork deflector.

Constant phase shift (can be determined from the ratio

ul

V. (1

+ -i-) L /

where CO is the angular frequency of oscillation

tuning fork branches 1 - distance from head to paper)

Vi is the speed of flight of the drop; Lj is the length of the branch of the tuning fork. Constructive constant C is defined by

C h

where h is the amplitude value of oscillations of the branch of the tuning fork.

To obtain a pin of a standard size (character height 2.5 mm for lower case characters and 3.2 mm capital letters), 15 points in a column (print point diameter 0.2 mm) are sufficient.

The table shows the phases of oscillations of the tuning fork corresponding to the moments of the output of the write signals to the head, with a uniform distribution of points in the column.

To obtain the tuning fork control signals and the write pulse synchronization signals, the principle of dividing the external sync pulses of increased frequency is used.

The frequency of the external synchronization pulses can be determined by the necessary accuracy of determining the phase of oscillations and the speed of the head. In order to ensure the required accuracy of the recording synchronization phase separation and a constant displacement tp, the O – P / 2 segment is divided into 256 cycles, which corresponds to the minimum phase distance between two synchronization signals of 20 cycles.

Thus, when using a writing head with a nominal 10 kHz, the frequency of the external synchronization pulses should be 200 kHz.

The external synchronization pulses of the SI are fed through circuit 1 to the inputs of circuits 12 and 13, the outputs of which are connected to the counting inputs of the eight-bit synchronization counter 14.

Pa other inputs of the circuits And 12 and 13 are connected to the outputs of the trigger 15. control account, which works in

counting mode on the transfer signals from the counter lA, arriving PA his sync input through the scheme OR 16.

Thus, the synchronization counter 14 by the signals of the external synchronization operates in the counting mode by +1 until the accumulation of the code 255 (, (j, then as a result of switching the trigger 15

translate. in account mode at -1.

When reaching code 0 ,. With the appearance of a signal at the P + output as a result of switching the trigger 15, the counter 14 again goes into counting mode at +1.

The counter outputs are connected to the corresponding address inputs of the control memory 17 (PR55 chip K556 РТ4), to the S1-rotating input resolution of which the external synchronization circuit is connected.

The following signals are removed from the outputs of the control memory;

1 - point record synchronization pulse;

2, 3 - impulses of installation and signal removal Ready;

4 - impulse control tuning fork.

Table nporpaNMHpoaaHHH admin

memory (chip K556RT4) is shown in Fig. 4.

In order to maintain the oscillator of the tuning fork uninterruptedly, a trigger 5 is used. 18 of the column sweep unit output of which is connected to the input D of the tuning fork control trigger 19, the outputs of which are connected to the input of the tuning fork causative amplifier 20.

The trigger of the column sweep is switched over by the signals of the P + counter 14, which ensures the switching of the trigger 19 by 1–1 pulses of the control 1 Quarter from the output 4 of the control memory 1–7.

Thus, when the external synchronization points are supplied, continuous oscillations of the tone chambers are provided. one

The tuning of the tuning fork to a given value of the oscillation frequency is carried out with the help of a device for adjusting the chromaticity of the deflector according to the maximum value of the signal from the oscillator T: tuning fork branches.

Fig. 5 shows the signals of the external synchronization of the SR 32, the synchronization records of the points 33, the state of the ready trigger 34, the control pulses of the tuning fork 35, as well as the external control signals of the block — the pulse of the recording of the column code 36 and the print resolution signal 37.,

For the purpose of presenting the timing diagram, the ticks corresponding to the unchanged states of the output signals of the control memory are omitted, and the ticks presented in the diagram are marked by the corresponding and by the states of the counter 14. After the last pulse of the column print (tick 173) in the clock 175, a pulse is generated at the output 3 of the control memory, as a result of which the ready trigger 21 and the point trigger trigger 22 are set to O,

At the same time, the outputs of the AND-HI circuits 23 and 24 are set to level 1, which translates the 16-bit shift register of the coda.column 25 into the parallel input mode (the register is made on two K 155 MF 13 chips), and a signal 12 is outputting a ready signal .

The readiness signal from the external generator of characters on the input bus of register 25 receives the code of the next character column, which is written to the register by the signal CAP received through the RSHI circuit 26 to the input of the register.

After the column code is written in repPr when the counter O is reached, it is again transferred to the counting mode at +1 and the synchronization pulses are issued in reverse order of clock cycles with the register 25 operating at the same mode,

In the fifth cycle, a switch signal is emitted by the tuning fork 8, when reaching the code 173 in the counter, the described cycle repeats. After printing a combination of dots in a column, the device is moved relative to the media one step.

If no points are printed in the column, the write pulses are

20

25

thirty

the print 25 of the next c-column-35-writing-head is not supplied, the print resolution signal is issued. The proposed design of the device (RP), which through the circuit 2 is fed to the circuit, provides reliability increase, the input D of the trigger 22 of the point recording. After accumulating in the counter code 255

40

the clock sweeps the column 18 controlling the direction of the sweep of the column, and the trigger 15 controls the counting of the counter 14, the counter is switched to the subtraction mode, and in clock 174 a pulse is output at output 2 of the control memory, which is 45

since the writing head is applied, which provides for the emission of ink droplets at the required time points, and there is no complicated deflector. In the proposed writing head, there is no drying of ink in the capillary. In addition, the recording quality increases due to the high chromaticity of the tuning fork deflector, which ensures the constant amplitude of oscillations.

O

turns off the ready trigger 21 to 1. At the outputs of the circuits I 23 and 24, signals determined by the state of the trigger 18 are generated, which ensures that the register 25 is set to the sequential shift mode in the corresponding direction.

In the next cycle (173), a sync pulse is written to record the first point of the column, which through inverter 27 is fed to the input of switch 28, to the other inputs of which are connected the outputs of trigger 18 of the column sweep, as well as the outputs of the first and sixteenth digits of register 25. On the falling edge is the write pulse through inverter 26 shifts the code in register 25.

When the code O reaches in the counter, it is again transferred to the counting mode at +1, and the output of synchronization pulses is repeated in the reverse sequence of clock cycles with the register 25 operating at the same mode,

In the fifth cycle, a switch signal is emitted by the tuning fork 8, when reaching the code 173 in the counter, the described cycle repeats. After printing a combination of dots in a column, the device is moved relative to the media one step.

If no points are printed in the column, the write pulses are

0

five

0

writing head is not supplied, the proposed design of the device provides increased reliability

since the writing head is applied, which provides for the emission of ink droplets at the required time points, and there is no complicated deflector. In the proposed writing head, there is no drying of ink in the capillary. In addition, the recording quality increases due to the high chromaticity of the tuning fork deflector, which ensures the constant amplitude of oscillations.

room

points1234567

at

column

The value of the phase -1,0P -0,84P -0,67P -0,52P -0,3811 -0,25P -0,13P

IProductSheets

Point number

in 89101112131415

column

Phase value of 0.1311 0.25P 0.38P 0.52P 0.67P 0.88P 1.07P

Pptyuv

FIG. 3

B iffri PS r - .. ё I S

B iffri PS r S

.. ± .1 ± 1.JL1.M.1JL.1.

33

JLJLJUUJIJLJIJIJUIJIJLJIJLJULJL.

Editor N.Shvydka Order 3202

Sustainer N.Lapkov

Tehred N.Glushchenko Proofreader of the City of Reshetnik

Tirshk 693Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab.,.

; Guy; Gogsthe; 7-; Gl7g ;;; GchGs: ;; G ;; yodp g, Uzhgorod, st. design, 4

Claims (1)

2. The device according to p. ^ Characterized in that the control and synchronization unit comprises serially connected column register, switch, former, point recording amplifier, sequentially connected counter, control memory, standby trigger, point recording trigger, second generator and point recording amplifier, a counter connected in series, a first OR circuit, an account control trigger and connected to the corresponding inputs of an account control trigger, a first and second AND circuit, connected in series with a trigger column wrappers, tuning fork control trigger and tuning fork amplifier, the outputs of the first and second AND circuits being connected to the counter inputs, one of the inputs of the first OR circuit connected to the input of the column scan trigger and one of the counter outputs, the first control memory output connected to the inverter input the output of which is connected to one of the inputs of the switch, the inverter input is connected to one of the inputs of the second OR circuit, the output of which is connected to one of the inputs of the register, the fourth output of the control memory is connected to the second input of the trigger the tuning fork, the second output of which is connected to the second input of the tuning fork amplifier, the output of the first driver is connected to the second input of the second driver, the third output of the control memory is connected to one of the inputs of the recording trigger, points, and to the readiness trigger, the output of which is connected to the first inputs of the first and second NAND circuits, the outputs of which are connected to the corresponding inputs of the register, the second inputs of the first and second NAND circuits are connected respectively to the first and second outputs of the trigger trigger. The invention relates to computer technology and communications and can be used to record raster images in computer output devices, electronic teletypes and facsimile devices.