SU1049936A1 - Printer - Google Patents

Description

The invention relates to devices using an electrochemical printing method and intended for the speedy recording of alphanumeric information output from electronic computers. Printers are known which use an electrochemical recording method in which paper impregnated with electrolyte is passed between two electrodes — a needle-anode and a cathode made of tellurium, for example. When applying voltage to the electrodes, the tellurium particles are transferred to the boom, giving it a brown-black color. In this way, an image with high optical density and resolution is obtained at a registration rate required for information processing systems l. The closest to the invention to the technical essence is a device containing a carrier transport mechanism, a cathode-shaft recorder, made in the form of a set of printing heads, each of which contains a group of isolated electrodes 2j. However, when printing arrays of alphanumeric information and with electrolytic wear of the cathode-shaft, wear of the electrodes of the printing heads is also observed. The amount of wear depends on the operating time of the electrode during the registration process. The configuration of alphanumeric characters is such that this time of operation of different electrodes of the printhead is very different, resulting in uneven wear of the electrodes. Due to the deterioration of the contact of the most worn electrodes with paper, the optical density of prints decreases. In addition, geometric distortions of signs are possible, arising due to uneven pressing of electrodes to paper. Printing becomes substandard. It requires stopping the device, trimming the electrodes followed by grinding the electrodes to the shaft. The purpose of the invention is to increase the quality of printing by eliminating geometric distortions of signs. This goal is achieved by the fact that the device contains a matrix printing mechanism, a character generator, whose input is an information input of the device, amplified, the outputs of which are connected to the matrix inputs. printing mechanism, additionally introduced inverters and switches, the number of which is equal to the number of electrodes in the print heads, the inputs of the inverters are connected to the second information inputs of the switches and the output th character generator. the outputs of the inverters are connected to the first information inputs of the x5 switchboards, the outputs of which are connected to the inputs of the amplifiers, the control inputs of the switches are the control inputs of the device. The drawing schematically shows the proposed device. The information input of the character generator 1 is associated with the output of the control unit (conventionally not shown in the drawing). The control outputs of the control unit are connected to the first and second control inputs of the alignment unit 2 and the switches 3. The information output of the character generator 1 is connected to the inputs of the inverters 4 and the second information inputs of the switches 3, to the first information inputs of which the outputs of the inverters 4 are connected. The inputs of the switches 3 are connected to the first inputs of the And 5 elements, the first control inputs of the wear switches are connected to the second inputs of the And 5 elements. The second information inputs of the switches 3 are connected to the first inputs of the elements AND b, to the second inputs of which the second control inputs of the switches are connected. The outputs of the elements And 5 and b are connected to the inputs of the element OR 7. The outputs of the elements OR 7 are information outputs of the switches 3, connected to the inputs of the amplifiers 8, the outputs of which are connected to the matrix printing mechanism consisting of electrodes 9, the print head 10 and the mechanism a transport (not shown) providing movement of the paper tape 11 between the electrodes of the print heads 9 and the cathode shaft 12 of tellurium. Inverters 4 - 4 and switches 3 - 3 are structurally integrated into unit 2 of electrode leveling. The device works in the following way. The array of information from the control unit of the printing device (not shown) goes to the character generator. torus 1. The symbol generator is a permanent storage device in which cells the information about the graph of printed characters is stored. This information enters line by line into the electrode wear alignment unit 2 at the first information inputs of the switches 3 and into the inverters 4. Depending on the presence of permission at the first or second control inputs of the electrode wear alignment unit 2, a direct or inverse graphic code value is generated at the output of the unit image mark. From the output of the electrode wear alignment unit 2, the code combinations of the pulses go to the output amplifiers 8, where they are amplified to the values required for the registration process, and then to the electrodes 9 of the printhead 10. The transport mechanism advances the tape 11 of the electrically conductive paper by pulling it between the tellurium cathode-shaft 12 and the writing part of the electrodes 9. When a voltage is applied to the electrodes 9, the tellurium, in the form of ions, is separated from the cathode-all-12 into the solution with which the tape 11 is impregnated and remains on paper in the form of points of black color. proceeds very quickly, which is why the registration rate is high (up to 500 lines / s).

The operation of the device is divided into two cycles: printing the main text and leveling the wear of the electrodes. In the first cycle, the input of the wear leveling unit 2 is fed to the first control. The resolution is applied to the second, and to the second one it is applied. At the same time, switching of switches 3 takes place, and information is sent to the output code 8 in the forward code. Thus, the main text is printed. After printing the main text in the control unit of the printing device, a signal is generated, which starts the second cycle - leveling the load on the electrodes. In the second cycle, the information displayed in the first cycle is repeated, but the character plot is displayed in inverse. For this, a permission is issued to the second control input of the wear leveling unit 2 from the device control unit, and a ban is given to the first control input. Switch 3 is switched and inverse is fed to output amplifiers 8

0 value graphics output characters. The printout is performed without interline spacing on the technological length of the paper tape.

Using block alignment

5 wear length Ensuring uniform wear of the electrodes. This permits an increase in print quality, as electrochemical lapping of the electrodes of the recorder's recording heads occurs. In addition, despite the doubling

0 duration of the recorder during the printing process of the output array, the total service life of the printheads before replacement is increased, since during mechanical pruning

5 and lapping the consumption of electrodes more.

The efficiency of the used block also consists in excluding the operations of mechanical grinding of electrodes and grinding the recorder to the shaft, which takes a lot of time and requires high qualification from the operating personnel. Excluding these operations also improves the performance of the device as a whole.

Claims (1)

A PRINTING DEVICE comprising a matrix printing mechanism, a character generator whose input is the information input of the device, amplifiers whose outputs are connected to the inputs of the matrix printing mechanism, and a join; that, in order to improve print quality by eliminating geometric distortion of characters, inverters and switches are introduced into it; with the inputs of amplifiers, the control inputs of the switches are the control inputs of the device,