RU1813658C - Ink-jet printing machine - Google Patents

Abstract

The invention relates to inkjet printing. The device comprises three jet heads located around the axis of the device with the same angles to it, as well as a control unit with three control channels, each of which controls the speed of the droplets from one of the jet heads. The presence of three inkjet heads makes it possible to seal the entire area of the printed sign in two coordinates with a stationary paper carrier, which is essential. 2 ill.

Description

The invention relates to inkjet printing and can be used for contactless recording of computer images.

The purpose of the invention is to increase the speed of an inkjet printing apparatus.

Figure 1 shows a General view of an inkjet printing device; Fig. 2 is a schematic diagram of a control unit.

The inkjet printing device comprises three inkjet heads 1,2 and 3, the axes of which intersect at the focus 4 of the device. The nozzle heads are directed toward the carrier 5. The inkjet heads 1,2 and 3 are connected to the outputs of the control unit 6 and to the ink tank 7.

The control unit 6 contains three control channels, each of which contains a memory unit 8, a register 9, a delay unit 10, a code-to-duration converter 11, a modulator 12 and an amplifier 13. The control unit 6 also contains a command unit 14, formers 15,16 and 17 signals, an OR element 18, a counter 19 and a pulse generator 20. Each memory node 8 contains a clock input 21 and an output 22, each register 9 contains a functional input 23 and an output 24 and a clock input 25, each delay unit 10 contains a function input 26, a clock input 27 and a clock output 28, each code-duration converter 11 contains a functional input 29, function output 30 and clock input 31, each modulator 12 contains function input 32, function output 33 and command input 34, each amplifier 13 contains input 35 and output 36. Command node 14 contains clock input 37, start input 38, output request 39 and team you stroke 40, each driver 15,16 and 17 pulses contains an input 41 and output 42, the OR element 18 contains inputs 43,44 and 45 and output 46, the counter 19 contains input 47 and output 48, and the pulse generator 20 contains input 49 and output fifty.

Ink jet printing device operates as follows.

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ON SL 09

For each clock pulse from the pulse generator 20, sequential sampling of the memory nodes 8 is made and the codes of pulse durations are recorded in registers 9 to record points with numbers 1,2,3, .. n of each column of symbol familiarity with three jet heads.

At the same time, for each clock pulse, the command unit 14 generates a request to print a point to the control computer of the device. Codes of durations of recording pulses from the outputs of the registers 9 are fed to the inputs of the converters 11 code - the duration and inputs of blocks 10 delay.

Due to the fact that ink droplets ejected by three inkjet heads 1,2 and 3 must necessarily meet at the device’s focus, and their flight speeds can be different, delay units 10 temporarily delay the signals depending on the signals received inputs of signal duration codes, with a longer signal duration corresponding to a longer signal delay.

According to the duration code at the input of the transducer 11, the code is the duration and the signal from the output of the delay unit 10, each transducer 11 generates a signal at its output whose duration corresponds to the necessary speed of ejection of an ink droplet from its head, and a longer ejection speed corresponds to a greater speed of ejection of a droplet from the nozzle of the head .

When a point signal of a print signal is received at the input of the command unit 14, the channel modulator 12 passes the generated signals to the inputs of the recording amplifiers 13. The droplets ejected at given speeds, having met at the focus of the device, form a new total droplet with a mass equal to the mass of the three original ink droplets, which flies to the paper along the path along the projection vector of the angular momentum of the three initial ink droplets. In this way, the first point of the first column of the character is printed.

At the same time, the signals from the outputs of the code-to-duration converters 11 go to the inputs of the signal drivers 15,16 and 17, the outputs of which are connected to the inputs of the OR element 18, the output of which is a sequence of three signals that are input to the counter 19, which outputs the signal from its output to triggering a pulse generator 20 to print the next point in the column. This provides synchronization of the device, allowing the start of the generator 20 pulses

0

5

0

5

0

5

0

5

0

5

only after generating print signals for all heads.

Each character is printed with the heads stationary. After printing all the dots on a given familiarity, the heads move to the next familiarity to print the next character. With the same weight of the initial droplets, the angle between the axis of each head and the axis of the device, which ensures maximum deviations of the combined ink droplets within the familiarity of the symbol in the range of allowable droplets of ink droplets and the selected distance from the focus of the device to the medium, is determined by the formula

6 aragЈ (+),

e L v VMSKC- VMHH

where A is the largest deviation of the total drop from the center of the printed figure;

L is the distance from the focus of the device to the printing plane;

VMaKc maximum drop velocity from the nozzles of the head;

VMHH - minimum droplet exit velocity from the nozzles of the head.

Claims (1)

The claims An inkjet printing device containing two inkjet heads whose axes are angled to the axis of symmetry of the device, an ink tank connected to the inkjet heads, and a control unit containing a command node with a sync input, a Start, an output Request and a command output, and two channels controls, each of which includes a memory node with a sync input and output, a register with functional input and output and a sync input, a code-duration converter with functional input and output and a sync input, a modulator with a functional input and output and command input and an amplifier whose outputs are connected to its jet head, and the input is connected to the functional output of a modulator, the functional input of which is connected to the functional output of the code-duration converter, the functional input of which is connected to the functional output of the register the functional input of which is connected to the output of the memory node, characterized in that, in order to improve performance, it contains a third ink jet head, the control unit contains three forms a signal isolator, a three-input OR element, a counter, a pulse generator, and a third control channel identical to the first and second, each control channel further comprises a delay unit with a functional input, a sync input, and a clock output. in each control channel, the functional input of the delay unit is connected to the functional output of the register, the clock input of each delay unit is connected to the sync inputs of all registers and memory nodes and to the output of the pulse generator, the clock output of each delay unit is connected to the sync input of its converter code-duration, the functional output of each converter code - duration through its signal driver is connected to one of the inputs of the OR element, the output of which is through a series-connected counter, the generator op pulses and command node 0 connected to the command inputs of all modulators, the axes of all inkjet heads intersect at one point located on the axis of symmetry of the device, and the angle between the axis of symmetry of the device and the axis of each inkjet head is determined by the formula 0 arCtgЈ (+ 2 Uminch and L v Umaks - Umin where A is the value of the greatest deviation of the total drop from the center of the printed figure, mm; L is the distance from the focus of the device to the printing plane, mm; UMZKS and v min - the maximum and the minimum at the drop out velocity of droplets from nozzles of nozzles, m / s. Figure 1 36 / Inkjet effJbfai /// 36 I tin sl rupnum gooobhu 36 I / Iff Ј I RUMUM gshu0hu 3