SU1169868A1 - Printing method - Google Patents

Abstract

THE PRINTING METHOD, which consists in producing a jet consisting of repeated groups of droplets, each of which includes a main droplet and at least one satellite droplet, charging each group with a common electric field pulse and transferring the same satellite droplets to the information carrier, characterized in that, in order to expand technological capabilities by providing simultaneous copies, at least one additional storage medium is used, and the main drops and the remaining additional media Whether the satellite groups are transferred to the appropriate additional media.

Description

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The invention relates to making copies in inkjet printing devices, in particular, inkjet output devices of a computer, a PC, and a multiplying apparatus.

The purpose of the invention is the expansion of technological capabilities by providing simultaneous copies.

FIG. 1 and 2 are a diagram of the device implementing the proposed method in FIG. 3-5 - experimentally measured results.

The printing method consists in producing a jet consisting of repeating droplet groups, each of which includes a main droplet and at least one satellite droplet, charging each group with a common electric field pulse and transferring the same satellite droplets of the groups to the information carrier. This uses at least one additional storage medium, and the main drops and the remaining additional drops-satellites of the groups are transferred to the respective additional carriers.

There are several ways to form a jet containing repeating groups of droplets with a variable ratio q / m.

For example, a jet is generated from repeating groups of droplets of various sizes, including primary (primary) droplets and cus-satellites (secondary droplets) formed from bridges between the main droplets, i.e., artificially, for each working droplet several simultaneous drops are formed (one or more) This can be achieved with different methods of droplet emission.

In the case of the generation of droplets by high constant pressure with synchronized splitting of the jet, this mode can be obtained by selecting the following parameters: fluid pressure 500 kPa; nozzle diameter, crushing frequency te | 30,100 kHz; the amplitude of the synchronizing effect of a certain form (N, P, W), for example, through the piezoelectric transducer LL eflO; .

When droplets are emitted by a strong electrostatic field, such a regular jet can be obtained when changing parameters within dee 150; 500 microns; 4 kPa emission voltage U6 2; 4 kV;

interelectrode distance he.2; 10 mm.

When droplets are emitted by a pulsating pressure, groups of different sized droplets can be obtained (the main and droplets satellites by increasing the pulse pressure energy above a certain level and appropriate selection of the pulse shape.

In all the considered cases of receiving a jet of different-sized droplets, the charge of all droplets of one group (main and satellite drops) is carried out at the time of the drop formation (detachment from the meniscus)

inductively from a common charging electric field, for example, when a jet passes through a cylindrical electrode.

Periodic groups of drops (from the main and duplicate) can be obtained in another way. For example, a stream of monodisperse droplets (of the same diameter) is generated, and grouping, i.e. imparting various q / m ratios to several consecutive drops, carried out

Ion way, for example, several needle – plane electrodes successively spaced along the trajectory, which provide corona discharges of different intensities at the time the beam is placed in the interelectrode gap of the corresponding needle.

In a number of cases, it is advisable to include in the periodic groups of drops both drops intended for printing the original and drops usually directed to the discharge,

Moreover, due to the differing q / m ratios in the total deflecting electric field, the first part of the drops prints the original, and the second part goes not to the drain, but to seal several copies.

The speed of the method of obtaining copies is due to the fact that several copies are printed at the same time and not. In series, as in the known methods, and as a result of using, in addition to the main drops, satellite drops, which are formed simultaneously with the main drops (the number of drops of satellites in several times larger than the main droplets) and in the prior art methods they merge with the main drops, i.e., are used for printing. In the proposed method, drops can also be used to increase the speed of copying, usually directed at the discharge, i.e. exclude discharge as an unproductive operation.

The device realizing the proposed method (Fig. 1) consists of a nozzle 1 with ink 2, a piezoelectric transducer 3, a charging electrode 4, deflecting electrodes 5, correcting deflecting electrodes 6, information carriers 7-9 (2, 3 or more paper strips) and traps 10 (may be missing).

five

The device (Fig. 2) works in the following way.

From the nozzle 1, one of the methods (electric field, high or pulsed pressure separation) generates periodic groups of droplets 11, including the main

0 drop 12 and redundant drop satellites 13 and 14 (in Fig. 2, high constant pressure and synchronizing crushing through piezoelectric vibrator 3 are used for this). At the time of the drop formation (detachment of the main drop and break of the jump to the satellite drops), they are simultaneously induced by induction by means of electrode 4 (the loading voltage Uz is proportional to the coordinate of the deflection of the drop on the carrier and changes from group to group droplets, with one coordinate of the sweep carried out by an electrostatic field, and the second with the mutual movement of the printhead and the information carrier, although other variants are possible). In this case, all droplets of group 11 acquire different ratios q / m proportional to the values of Uj and nd -flight drops to the information carriers by inertia (it is possible to use accelerating electric fields). At the point 15 of the take-off of a group of droplets, the deviating electric field 5 (17 const) drops each group due to the difference q / m scatter along different paths 16-19, although they are charged from one pulse Uj. At the same time, the main drops of each group print the original (drop by drop) and satellite drops each copy. Due to the difference in the masses of droplets in one group, the sizes of printed characters on different mines may be different. To eliminate this, you can enter your own corrective electric field 6 for each copy. For uncharged droplets may be absent), flying along trajectory 16, a trap 10 is introduced. In FIG. Figure 2 shows the variation of obtaining groups of monodisperse droplets (for example, from 3 drops), when each drop is simultaneously ionized by individual charges by means of corona discharges from needle-shaped electrodes 4. From group to group, charging voltages 31 52 53 change proportionally the coordinates of the deviations of points on the carriers, but the mutual relations of these stresses qi / m, qj / w from group to group are consequently consequently, the original and several identical copies are sealed. In the known printing methods, after one or several drops printing the original, several drops are directed to the drain (rock up to 80%), for example during the transfer of the information carrier to the schag to a new position. According to the proposed method (Fig. 4), groups of unused drops are included in the groups and, along with the original, several copies are printed with them, in that the use rate of the drops is increased, eliminating the discharge. The information signal is the charging voltage (Uj) proportional to the magnitude of the droplet deflection on paper, Uoconst may, on the contrary, vary from group to group proportionally to the deviation of the droplets, and U3.const (yM..U3i. "Ujs const). FIG. 3 and 4 are micrographs (copies) of the experimental formation of droplet groups, including the main drop and the satellites, with FIG. 3 shows the droplet emission by high constant pressure with crushing synchronization (µm; P 207 kPa Go 66kG, UC IOOB); and FIG. 4 - emission of droplets by a strong electrostatic field (dc 0.45 mm, h 6 mm, P 3.5 kPa and 3.8 kV). FIG. 5 shows photocopies of experimentally obtained prints of the original and one copy on a laboratory model, made according to the scheme of FIG. 1. Improving the reliability of devices that implement the proposed method is due to the fact that not several print heads (one for each copy) are used, but one print head (one loading and deflecting member) ensures simultaneous printing of several copies. When implementing the proposed method (it is possible to eliminate traps for droplets satellites and unused droplets and an ink recirculation system, which reduces their pollution and evaporation. This simplifies devices, reduces their size and increases reliability. The possibility of making copies simultaneously with the original expands the field of jet application printers, increases their versatility, which makes it possible to use them in computers, PCs, accounting machines, and copying equipment.

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PROVIDES SPEED QUALITY

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IMPORTANT SPEED QUALITY

Claims (1)

PRINT METHOD, which consists in obtaining a jet consisting of repeating groups of droplets, each of which includes a main droplet and at least one satellite droplet, charging each group with a common electric field pulse and transferring the same satellite droplets to the storage medium, characterized in that, in order to expand technological capabilities by ensuring the simultaneous receipt of copies, at least one additional storage medium is used, and the main drops and the remaining additional drops are sp party utensils are transferred to appropriate additional carriers. FIG. 1>