EP0013296B1 - Tintenstrahldrucker mit mehreren Geschwindigkeitsstufen - Google Patents

Tintenstrahldrucker mit mehreren Geschwindigkeitsstufen Download PDF

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Publication number
EP0013296B1
EP0013296B1 EP79103926A EP79103926A EP0013296B1 EP 0013296 B1 EP0013296 B1 EP 0013296B1 EP 79103926 A EP79103926 A EP 79103926A EP 79103926 A EP79103926 A EP 79103926A EP 0013296 B1 EP0013296 B1 EP 0013296B1
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EP
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Prior art keywords
signal
printing
speed
ink
character
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Expired
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EP79103926A
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English (en)
French (fr)
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EP0013296A2 (de
EP0013296A3 (en
Inventor
William Louis Buehner
James David Hill
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International Business Machines Corp
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International Business Machines Corp
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Publication of EP0013296A3 publication Critical patent/EP0013296A3/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers

Definitions

  • the present invention relates to an inkjet printer capable of operating at different speeds, with concomitant modification of the resolution of the characters.
  • the IBM 6640 inkjet printer uses the principles described in US-A-3,596,275.
  • a continuous jet of pressurized ink from a nozzle is disturbed and divides into droplets at a predetermined distance from the nozzle.
  • These droplets receive a charge which is applied to them by a charging electrode and then pass between two deflection electrodes to which a high voltage is applied, the value of the charge thus applied to the ink droplets determining their vertical deviation with a view to formation. of characters or other symbols on paper or other similar support placed in the immediate vicinity of the deflection electrodes.
  • the droplets receive no charge, or receive only a minimal charge; they are therefore not deflected when they pass between the deflection electrodes and are intercepted by a gutter, from where they are brought back to their starting point for reuse.
  • the vertical deflection of the droplets makes it possible to form or trace a column of ink stains or dots on the plane of the paper.
  • Each of the droplets of a given column receives a slightly greater charge than the droplet which precedes it, so that the column is formed, in the example cited, from bottom to top.
  • the characters are therefore formed, in a given matrix, by means of a series of columns of ink stains.
  • the various elements of the print head are arranged on a mobile carriage which carries out a predetermined path along the paper so as to allow the printing on the latter of characters or other symbols.
  • the IBM 6640 printer has a resolution of characters which makes it possible to obtain a print quality practically equal to that of a traditional typewriter, this resolution being of 94.5 pixels (hereinafter called »PELS ”) / Cm.
  • a peel is defined as being a point formed on the sheet of paper or other support by an ink droplet.
  • a character printing frame with a height of 4.23 mm (height of the character matrix), and printing performed in steps of ten i.e.
  • the printing speed of the IBM 6640 is around 90 characters per second and the character resolution is close to that obtained with a classic typewriter of excellent quality. However, it often happens that such a high resolution is not essential, especially if the document that is printed is for internal use or, for example, an advertising circular, an address list or any other document of the same type. .
  • the ratio of the number of droplets loaded to the number of droplets not loaded remains essentially the same whether the machine is operating in coarse printing modes or in fine printing mode. There is no change in the frequency of appearance of the number of charged droplets or in the ratio resulting from the number of charged droplets to the total number of droplets formed.
  • the second patent, US-A-3 938 641 describes a sequential dot matrix printer provided with a drive device of the type step by step.
  • the printing speed of the dot columns is controlled by modifying the printing speed signal.
  • the frequency is not subject to any variation to modify the carriage speed or the printing speed.
  • One of the objects of the present invention is therefore to provide an ink-jet printer making it possible to obtain the printing of characters whose resolution (or definition) can vary as described in claim 1.
  • the printer operates in a first mode called coarse printing (compared to the fine or high quality printing previously mentioned), in which the signal for the start of column printing is regularly suppressed or periodic, so that if you delete, for example, one of these signals out of two, the machine only prints a column of dots out of two also, which makes it possible to approximately double the speed of movement of the cart.
  • the printer operates in a second coarse printing mode, in which only one dot out of two is printed in each column, which has the effect of deleting a row of dots on of them.
  • a second coarse printing mode in which only one dot out of two is printed in each column, which has the effect of deleting a row of dots on of them.
  • the maximum number of peels (or dots) in each row in the case of a printing carried out, for example, in the step of ten, is twelve (24/2), while the maximum number of pels that each column contains remains forty.
  • the maximum number of pels in each row of said frame is 24 (in the case, as before, of a printing in steps of ten), but only 20 pels in each column, this achievement, like the first, to accelerate the speed of movement of the carriage, while maintaining the predetermined ink flow.
  • the average diameter of the ink droplets is 0.06 mm.
  • the dots or pels of the print matrix are separated by a center-to-center distance of 0.1 mm.
  • the ink tends to spread on the printing medium (which is generally constituted by paper)
  • the diameter of the dots or of the peels there is an increase in the diameter of the dots or of the peels, the value of which then becomes approximately equal to 0, 15 mm, which results in an overlap of the dots or peels on the paper.
  • the dots are separated horizontally by a distance of 0.2 mm center-to-center, and by a vertical distance of 0, 1 mm center-to-center; in the second coarse printing mode (deleting every other row of dots), the dots are separated horizontally by a center-to-center distance of 0.1 mm and vertically by a center-to-center distance of 0 , 2 mm.
  • the points are obviously separated, vertically and horizontally by a center-to-center distance of 0.2 mm.
  • the resolution is sacrificed in favor of a corresponding increase in speed, without however the predetermined ink flow rate being modified.
  • ink 1 maintained at a determined pressure is expelled from a nozzle 2a, by means, for example, of a droplet generator 2, under the form of a jet.
  • the ink contained in the nozzle cavity is made to vibrate at a fixed ultrasonic frequency by means, for example, of a circuit 3 which excites a piezoelectric crystal placed inside the droplet generator 2.
  • the pressure waves thus generated cause the jet 1 to be divided into a series of droplets having uniform dimensions and spacing, at a good distance defined from nozzle 2a.
  • a typical droplet generator is described in the publication "IBM Technical Disclosure Bulletin", Vol. 21, No. 5, October 1978, pages 1949-1950.
  • Each droplet thus formed receives an electric charge of a predetermined size when a voltage is applied to a charging electrode 4 which surrounds the point where the ink jet divides into droplets.
  • the droplet retains this charge for the duration of its flight to a support 5 consisting, for example, of a sheet of paper.
  • the different droplets pass through an electro-static field obtained by applying a fixed high voltage across the terminals of a pair of deflection plates 5 arranged horizontally.
  • Each droplet receiving a separate charge it can be deflected vertically by a desired distance.
  • the droplets are deflected vertically from bottom to top, so as to form on the sheet of paper a column entirely or partially composed of dots or peels.
  • the droplets which are not used for the purpose of printing a character and which therefore must not appear on the paper receive no charge and are not deflected. These latter droplets are intercepted by a gutter 6 and brought back to the droplet generator 2 for a new use, via an ink tank 6a, a filter 6b, an ink supply 6c and a pump 6d, which continuously supplies ink to the generator 2.
  • a typical ink recirculation system is described in patent US-A-3,929,071.
  • the droplet generator 2, the charging electrode 4, the deflection plates 5 and the gutter 6 are mounted on a carriage 7 which is driven horizontally and follows a predetermined path which brings it towards or away from the plane of the paper of the Figure 1, at a relatively constant speed during the printing operation.
  • the droplets are therefore deposited on the paper at suitable locations inside a character frame or a frame so as to form the desired character or symbol.
  • the carriage 7 is coupled to a drive device 7a, comprising for example a motor operating in direct current, which is excited by signals delivered, for example, by an excitation device 7b (in the preferred embodiment) under the control of the electronic circuits 8 of the system.
  • the printer comprises a detector 9 comprising a matrix 9a which emits and which receives and a concave mirror 9b arranged on the carriage on either side of a fixed network 9c of markers (mounted on the chassis of the machine), which network makes it possible, in conjunction with the matrix and the mirror, to generate signals which are transmitted to the electronic circuits of the system, both for applying a voltage to the charging electrode and for controlling the drive device 7b and, consequently, the device 7a connected to the carriage 7.
  • the detection method and device used are described in more detail in European patent application EP-A-0 006 441 filed on May 22, 1979 by the applicant.
  • the detection circuits used are also described in European patent application EP-A-0 006 482 filed on June 1, 1979 by the applicant.
  • the network 9c consists of two parts offset by 90 ° with respect to each other and includes opaque and transparent marks.
  • the array 9a includes a pair of light sources and a pair of detectors; the light which crosses the network is reflected by the mirror 9b and strikes the detectors which, by means of the circuits which are associated with them, generate alternating signals, such as those represented under the letter "B" of Figures 2, 3 and 4 (for the sake of clarity, the signals generated by the two detectors are respectively referenced "Det. A” and "Det. B").
  • the output of one of the two detectors can be used in conjunction with a counter to count the transitions (opaque to transparent) and, the network comprising a predetermined number of marks, to indicate with precision the position occupied by the carriage 7 the along its course.
  • the output of detector B is used to indicate the position of the carriage and provides the information relating to the start of printing of each column.
  • the pulses indicated in FIGS. 2, 3 and 4 and designated SOS indicate the start of printing of a column by means of a series of droplets.
  • the network associated with detector B has 23 divisions per cm, and if the resolution is 94.5 pels / cm, each of the divisions of the network must be divided by four to obtain the resolution required to form a character such as the letter "B" shown in Figure 2.
  • the output of the second detector, such detector A, is used for comparison with the output of detector B to inform electronic circuits of the direction in which is moving carriage.
  • the resolution of a character can be modified so that it becomes that of, for example, the character represented in FIG. 3, this latter resolution being defined below as corresponding to the first printing mode. coarse.
  • This result is obtained, in the case of character "B" in FIG. 3, by increasing the speed of movement of the carriage and by simultaneously suppressing one column start printing signal (or SOS signal) out of two, this signal being used to apply a voltage to the charging electrode 4.
  • the second coarse printing mode can be obtained by printing only one row of dots out of two when plotting a column.
  • account should be taken of the fact that normal aerodynamic repulsions should be corrected and the interactions between charged droplets should be compensated for, for example by means of a modified correction memory.
  • FIG. 5 shows the electronic circuits 8 of the printer incorporating the present invention.
  • the circuits schematically represented in FIG. 5 are essentially the same as those used in the IBM 6640 printer, with the exception of block 30, representing the logic relating to the coarse printing mode, and some modifications made to block 19, relative to the positioning of the ink droplets, blocks which are respectively described below with regard to FIG. 6 and of FIG. 7.
  • a microprocessor or other similar device 10 comprising other input devices 10a, such as a typewriter, a disk drive device, etc., functions as the main system vis-à-vis screw of the inkjet printer schematically shown in Figure 5.
  • An input / output channel consisting of 14 lines is connected to the printer, namely eight (in the example shown) data lines, four control lines, an interrupt line and a line for transmitting signals from a main clock.
  • Interface 11 of the printer provides, in a conventional manner, the transfer, logic, and amplification functions and the signals supplied by the main clock are applied to the system clock 12, in which frequency division circuits divide the frequency received from the main clock, which is converted to four clock frequencies, T1 to T4, shown in Figure 9.
  • the signals from the input / output channel can be amplified and appropriately stored in memory that serial instructions can be received from microprocessor 10.
  • the data received by the electronic circuits of the printer and relating to the printing instructions consist of three bytes, as explained below.
  • the interface 11 therefore includes a buffer memory associated with these three bytes coming from the microprocessor.
  • the first byte of a printing instruction is an address which is applied, via the interface 11, to the character generator 13, defining the character to be printed. (Assuming it is recognized as a print instruction.)
  • the generator 13 transmits the full or partial address of this character, via the common line "address", to memory 14, and receives from the latter the data relating to said character by means of common data lines 15.
  • the data thus extracted from the memory 14 relate to the printing of a single column of dots forming part of this character.
  • the second and third bytes of the signal received from the microprocessor are applied to a logic circuit 16 called mechanism control, to inform the latter of the position of the first column of dots of the character to be printed.
  • the first byte is applied via the interface 11 to the logic circuit 16 in order to be decoded and to trigger the execution of the function whose it's about; for example, bit configuration 11010101 is decoded as representing a tabulation function and configuration 10110101 is decoded as defining a backspace function.
  • the second and third multiples can also be applied to logic circuit 16 to perform appropriate actions when the carriage occupies the position specified by these bytes; for example, if a tabulation instruction has been decoded, the second and third bytes specify the point where the carriage should stop after the tabulation function is executed.
  • the functional block 16 can be used to perform many functions. For example: (1) control and synchronize the operation of circuit 18 of French patent application FR-A-2 410 248 filed on September 26, 1978 by the plaintiff, which circuit carries out a periodic check of the series of droplets of ink to determine if the height at which these are deflected is within the prescribed tolerances; (2) serve as an instruction decoder for the synchronization and servo control operations of an ink pump such as that described in patent US-A-3,787,882; (3) controlling the operation of the drive device 7a of the carriage and consequently the horizontal speed (in the present example) of the carriage 7 in the case in particular of the use of the excitation device 7b; (4) serve as a motor drive control device and receive the network position signals emanating, for example, from the detector 9 shown in FIG.
  • variable speed drive can obviously take the form described in the publication entitled "IBM Technical Disclosure Bulletin", Vol. 20, No. 10, March 1978, pages 3993-3994, but it is preferable that it be of the type described in the patent application US-A-954374 indicated above.
  • MCSOS start of column printing
  • the generator 13 continues to receive data relating to the printing of a column of the character designated by the first byte and to transmit via the common line 13a a print signal to the circuit 16 so that the cycle printing of this character continues until a so-called end of character printing signal is transmitted by the generator 13 to the circuit 16 via the line 13a. Furthermore, the circuits 19 generate another signal which opposes the transmission of the signals until the said circuits are ready to accept from the character generator 13 new data which will be used to apply the required voltages to the electrode. charging the printer.
  • the printing signal transmitted on line 13a takes precedence over the end of character signal, such that the column printing start signal continues to be generated, and data continues to be retrieved from memory 14, etc., so that the required voltages can be applied to the charging electrode.
  • the memory 14 can comprise several unalterable memories, the selection of a determined assortment of characters being a function of the input received from the microprocessor 10. A method making it possible to change the assortment of characters by selecting different parts of memory is described in the US patent No. 3,963,591.
  • the machine operates essentially in the manner described above, which is that used in the case of the printer 1 BM 6640.
  • the first coarse printing mode can be used to produce characters such as "B" represented in FIG. 3.
  • logic circuits 30 known as coarse printing are inserted between circuits 16 and 19 ( Figure 5). These circuits 30 only intervene in the case where it is desired to obtain a rough impression.
  • an SOS signal which is actually a converted MCSOS signal (see below) can directly access circuits 19 bypassing circuits 30 .
  • a signal (part of the three-byte signal from microprocessor 10) being decoded by circuit 16 and indicating that the speed of the machine must be increased and the resolution reduced so as to form characters of the type represented in FIG. 3, the decoding of, for example, 11110100 gives a first signal (COARSE PRINT or IG) whose first appearance indicates a change to the coarse print mode.
  • the signal IG (see Figure 9) is applied to one of the inputs of a flip-flop of the master / slave type or of a pair of flip-flops 31 so as to produce several signals at different clock times, T1 to T4, as shown in Figure 9.
  • the flip-flop 31 consists of NI gates, designated 31A to 31 H in the particular embodiment shown, and a single inverter 31j, to obtain the locking signals "(INLK),” not locked “(INLK),” sequence "(SEQ),” not sequence "(SEQ), and” not rough printing "(IG).
  • the signals "power-on restore” (POR) or “no power-on restore” (POR) are the conventional signals obtained from the logic used to start or initialize the machine.
  • the input signals applied to the flip-flop 31 are the clock pulses T1 and T4 as well as the first signal IG coming from the decoding part of the circuit 16.
  • the master / slave flip-flop or the pair of flip-flops 32 also consists of NI gates 32a at 32h and includes an inverter 32j at its output.
  • Some of the inputs of the flip-flop 32 are generated by this pair of flip-flops, for example the signals known as "excitation of the high-speed master flip-flop” (HSPM) and “non-excitation of the high-speed master flip-flop” (HSPM), which has the effect of bringing the inputs known as “high speed slave flip-flop excitation” (HSPS) and “non-excitation of the high speed slave flip-flop” as inputs to the gates NI 32a and 32b.
  • HSPS high speed slave flip-flop excitation
  • (HSPS) as well as the clock pulse T4.
  • the signals SEQ and INLK are obtained from flip-flop 31.
  • a third master / slave flip-flop or pair of flip-flops 33 receives an MCSOS signal from the carriage position logic that comprises the circuit 16.
  • this MCSOS signal is obtained from the detector 9 of Figure 1 and the circuits which are associated.
  • the MCSOS signal and the SOS signal are one and the same signal when the printer is operating in the so-called fine print mode, which allows characters such as that shown in Figure 2.
  • the MCSOS signals generated are a multiple of the number of lines or divisions in the network. Thus, in the example cited, if the network has 23.6 divisions per cm, 94.5 MCSOS signals will be generated per cm of movement.
  • the master / slave flip-flop or the pair of flip-flops 33 functions as a divider by two circuit generating a column printing signal emanating from the "master" part of the flip-flop (SCNM) and an analogous signal. supplied by the "slave” part (SCNSM), as well as the logic inverses of these signals, all of this in relation to the clock instants T2 and T4 which constitute the inputs of flip-flop 33.
  • the latter consists of NI gates 33a at 33h and an AND gate 34 whose first input receives the SCNS output from gate 33h.
  • the AND gate 34 has a second input which completely avoids the flip-flop 33 and is constituted by the MCSOS signal. In this way, when the signals SCNS and MCSOS are both at the high level and coincide, the AND gate 34 generates an output, which is the SOS signal. Since the flip-flop 33 functions as a divider by two circuit, when the machine operates in the coarse printing mode, the SCNS signal is at the high level only half the time and, therefore, the signal SOS has only half the frequency of the MCSOS signal. The SOS signal shown in Figure 3 therefore has only half the frequency of the SOS signal shown in Figure 2, so that, in comparison with the fine print mode, every other column is not printed .
  • the signal SCNS is always at the high level, and consequently, when this signal coincides with the signal MCSOS, the signal SOS is generated by the AND gate 34 at a frequency which is necessarily the same as that of the MCSOS signal.
  • the various inputs received by the flip-flop 33 are generated by the HSPS signal emanating from the flip-flop 32, and by the flip-flop 33 itself, as shown in the Figure.
  • the SOS signal thus generated is applied to the logic circuit 19 for positioning the droplets which, as previously indicated, is excited when it receives this signal from circuit 16 together with a signal "ready to print column “(PIC) emanating from the character generator 13 and generated as described below.
  • the logic circuit 19 comprises an input flip-flop or flip-flop of the RS 35 type, which is coupled to a second flip-flop or to a second flip-flop RS 38, and a third flip-flop or a third flip-flop 37, appropriate input signals being applied to a pair of flip-flops and to a flip-flop of the master / slave type 38.
  • Flip-flops 35 to 37 consist respectively of Ni gates 35a to 35d, 36a at 36d, 37a to 37c, while the pair of flip-flops 38 consists of NI doors 38a at 38h.
  • a shift register 40 which is controlled by a control circuit 41 makes it possible to transfer the data relating to the printing of the columns, as described in more detail below, to the digital / analog converter 20 (FIG. 5), via the common line 19a, and to the charging electrode 4 associated with a nozzle 2a which comprises the droplet generator 2.
  • Logic circuit 19 operates as follows.
  • SOS column start printing signal
  • the flip-flops When the column start printing signal (SOS) is applied to the input flip-flop 35, if the rest of the circuit composed of flip-flops 38, flip-flops 37 and 36 has completed the operations relating to the printing of the column of previous points, the flip-flops generate a loading signal of the shift register, or LDSR signal (see output from gate NI 37b) allowing the transfer of the data relating to the printing of a column, from the forty-bit shift register 39 contained in the character generator 13, at the forty-seven bit shift register 40.
  • the shift register 39 has a serial data input SDI which receives the data relating to printing from memory 14 of a column.
  • a signal is generated and applied to the circuit 39a for decoding the PIC signals (which circuit is an AND gate with multiple inputs) which, when it simultaneously receives the LDSR signal emanating from the gate 37b, generates a PIC signal to indicate that the printing of a column is ready to be carried out.
  • the control circuit 41 authorizes the transfer of the data relating to the printing of a column, via the common line 39d, to the shift register 40, and subsequently via the common line 19a, to the digital / analog converter 20.
  • the flip-flop or flip-flop 35 allows you to store the SOS signal until the printing of the previous column is complete (note that the NI 35a gate receives as inputs a delayed SOS signal (SOSD) and a signal T2 clock however that the NI gate 35b receives in particular a signal SCNST, meaning "non-stored SCN", and a clock signal T4).
  • the signal “stored SCN (SCNST) is obtained at the output of the pair of flip-flops 36.
  • the circuit shown in FIG. 7 makes it possible to process column printing data presented in series and of exceptional length. that can overlap the signal Next SOS, a catch-up can take place if these data are longer than those relating to the printing of the previous column and the next column.
  • the printer'lBm 6640 it is necessary to compensate for the aerodynamic effects specific to the ink droplets, as well as the interactions which can occur between charged droplets, so that the droplets strike the sheet of paper at the relative positions desired.
  • the method used in the IBM 6640 printer is described in US-A-4,086,601. According to said method, the least significant bits emanating from the shift register 40, for example the last seven bits or more, are used as the address of the main memory 42 of a correction data memory, as shown in FIG. 8.
  • the output of the main memory 42 is applied to a common line called memory data and transmitted to the digital / analog converter 20 by via the common line 19a so that the appropriate voltage can be applied to the charging electrode for each bit representation of a droplet forming part of the printing of a column.
  • the correction data memory uses a threshold voltage to prevent the droplets intended to be printed from being intercepted by the gutter. Further details will be found in the U.S. patent. cited above.
  • the present invention also makes it possible, instead of printing only one column out of two, to skip a row of printing points out of two or to print only one point out of two when printing a column (although this printing mode is not the preferred mode, the visual impression obtained may be more pleasant in the case of certain types of character). For example, omitting one out of two droplets increases the printing speed so that it is approximately twice as much as omitting one column out of two. that obtained in fine print mode.
  • the pair of flip-flops 33 in Figure 6 is unnecessary and the MCSOS signal can be directly applied to the flip-flop RS 35 in Figure 4, the latter signal then being equivalent to the SOS signal.
  • the rest of the circuit of Figure 6 can be used to obtain the so-called coarse printing speed (VIG) signal which is applied to the motor control device associated with the carriage in order to increase the movement speed of the latter. .
  • VOG coarse printing speed
  • the second modification required to print only one row of dots out of two in each column consists in ensuring that the signal VIG is applied to the control circuit 41 of the shift register (this signal being designated VIG * so that only one data out of two relating to the printing of a column is loaded into the shift register 40 via the common line 39b, for example under the control of the loading pulse generated by the control circuit 41.
  • the shift register receives only one binary data out of two, which indicates that one ink droplet out of two is not intended for printing and must be intercepted by the third necessary modification, once again assuming that the process used to compensate for the interactions between charged droplets and the aerodynamic effects is that described in the aforementioned patent U $ -A-4,086,601, consists in selecting the memory 43, related e in the coarse printing mode, so that the required corrections can be made to the droplets via the common line "memory data" from this memory, instead of being from the main memory 42.
  • the techniques for printing a column of dots out of two and a row of dots out of two described above can be combined so as to obtain a character similar to that shown in the Figure 4 in the coarse printing mode
  • the MCSOS signal should be at the high level to allow printing of one column out of two
  • the VIG * signal should be applied to both control circuit 41 of the register shift 40 and memory 43 for the purpose of selecting the correction data memory.
  • the microprocessor 10 should obligatorily inform the control circuits of the machine that, in the coarse printing mode requested, the operating speed should be approximately equal to four times that achieved in the fine printing mode, and this by means of a signal obtained from the signal VIG of FIG. 6, and would further transmit a second signal of which one would perform, for example, the AND function to indicate the increase in speed required by the microprocessor.
  • the present invention therefore provides an ink-jet printer capable of varying the resolution of the characters it prints while making a corresponding variation in the printing speed, this result being obtainable by making minor modifications to the existing equipment. .

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)

Claims (11)

1. Tintenstrahldrucker mit fortlaufender Tintenstrahlabgabe, in dem der Wagen (7) eine eine Folge von Tintentröpfchen mit einem vorbestimmten Fluß abgebende Düse (20), eine Ladeelektrode (4) der Tintentröpfchen und Ablenkelektroden (5) der Tintentröpfchen aufweist, um die Aufzeichnung von Zeichen auf einem Aufzeichnungsträger durch Bildung einer Spalte von Punkten durchzuführen, wobei eine erste vorbestimmte Zeichenauflösung von einer höchsten Anzahl von Bildelementen in jeder Breiteneinheit und Höheneinheit innerhalb eines Zeichenrahmens mit vorbestimmten Abmessungen festgelegt ist, wobei der Tintenstrahldrucker dadurch gekennzeichnet ist, daß er aufweist:
einen Zeichenerzeuger (13) zur Erzeugung von Daten, die der zu ausgewählten, zu der Aufzeichnung einer einzelnen Zeichenspalte gehörigen Tintentröpfchen zu versehenden Ladung entsprechen, und Abtastmittel (19) zur Angabe der Lage und der Bewegungsrichtung des Wagens in jeder Zeit und zur Erzeugung eines ersten, als MSpaltenaufzeichnungsbeginnx genannten Signals, das den Zeitpunkt des Aufzeichnungsbeginns jeder Spalte von zu einem bestimmten Zeichen gehörigen Bildelementen anweist;
eine Einrichtung (7a, 7b) zum Antrieb des Wagens mit einer variablen Geschwindigkeit, eine Positionierungsschaltung (19) der Tintentröpfchen zur Aufnahme der Daten und des ersten Signals, die mit der den Tintentröpfchen mit einer Ladung versehenden Ladeelektrode (4) in Abhängigkeit von den Daten zur Bildung eines einzelnen einer ersten Auflösung entsprechenden Zeichens mit einer ersten Wagengeschwindigkeit gekoppelt ist, wobei die folgenden Mittel zur Erhöhung der Aufzeichnungsgeschwindigkeit auf dem Aufzeichnungsträger angewendet sind, indem der Fluß der Tintentröpfchenabgabe bei demselben vorbestimmten Wert bleibt; SOS suivant, un rattrapage pouvant avoir lieu si ces données sont plus longues que celles afférentes ä l'impression de la colonne précédente et de la colonne suivante.
Dans l'imprimante'IBM 6640, il est nécessaire de compenser les effets aérodynamiques propres aux gouttelettes d'encre, de même que les interactions qui peuvent se produire entre gouttelettes chargees, de teile sorte que les gouttelettes frappent la feuille de papier aux positions relatives désirées. Le procédé employé dans l'imprimante IBM 6640 est décrit dans le brevet US-A-4 086 601. Conformément audit procédé, les bits de plus faible poids émanant du registre à décalage 40, par exemple les sept derniers bits ou davantage, sont utilisés comme adresse de la mémoire principale 42 d'une mémoire de données de correction, comme le montre la Figure 8. La sortie de la mémoire principale 42 est appliquée à une ligne commune dite de données de mémoire et transmise au convertisseur numerique/analogique 20 par l'in- termédiaire de la ligne commune 19a de teile sorte que la tension appropriee puisse être appliquée à I'electrode de charge pour chaque represenation de bit d'une gouttelette faisant partie de l'impression d'une colonne. La mémoire de données de correction utilise une tension de seuil pour éviter que les gouttelettes destinees ä être imprimées ne soient interceptees par la gouttière. On trouvera d'autres précisions à cet égard dans le brevet des E.U.A. précité.
La présente invention permet également, au lieu de n'imprimer qu'une colonne sur deux, de sauter une rangée de points d'impression sur deux ou de n'imprimer qu'on point sur deux lors de l'impression d'une colonne (bien que ce mode d'impression ne soit pas le mode préféré, l'impression visuelle obtenue peut être plus agréable dans le cas de certains types de caractère). Par exemple, l'omission d'une gouttelette sur deux permet, de même que dans le cas de l'omission d'une colonne sur deux, d'augmenter la vitesse d'impression de teile sorte qu'elle corresponde approximativement au double de celle obtenue dans le mode d'impression fine. A cet égard, la paire de bascules 33 de la Figure 6 est inutile et le signal MCSOS peut être directement appliqué au flip-flop RS 35 de la Figure 4, ce dernier signal étant alors équivalent au signal SOS. Cependant, le reste du circuit de la Figure 6 peut être employé pour obtenir le signal dit de vitesse d'impression grossière (VIG) qui est appliqué au dispositif de commande du moteur associé au chariot afin d'augmenter la vitesse de déplacement de ce dernier.
La seconde modification requise pour n'imprimer qu'une rangée de points sur deux dans chaque colonne consiste à faire en sorte que le signal VIG soit appliqué au circuit de commande 41 du registre à décalage (ce signal étant désigné VIG* de teile sorte que l'on ne charge dans le registre à décalage 40 par l'intermédiaire de la ligne commune 39b qu'une donnée sur deux relative à l'impression d'une colonne, par exemple sous le contröle de l'impulsion de chargement engendrée par le circuit de commande 41. De la sorte, le registre à décalage ne reçoit qu'une donnée binaire sur deux, ce qui indique qu'une gouttelette d'encre sur deux n'est pas destinée à l'impression et doit être interceptee par la gouttière. La troisième modification necessaire, en supposant de nouveau que le procédé employé pour compenser les interactions entre gouttelettes chargées ainsi que les effets aérodynamiques soit celui décrit dans le brevet précité US-A-4 086 601, consiste à sélectionner la mémoire 43, afférente au mode d'impression grossière, de telle sorte que les corrections requises puissent être apportées aux gouttelettes par l'intermédiaire de la ligne commune »données de mémoire« depuis cette mémoire, au lieu de l'être depuis la mémoire principale 42.
Dans une variante de la presente invention, les techniques d'impression d'une colonne de points sur deux et d'une rangée de points sur deux decrites ci-dessus peuvent etre combinees de maniere à obtenir un caractère analogue à celui représenté sur la Figure 4 dans le mode d'impression grossière. Dans ce cas, le signal MCSOS devrait être au niveau haut pour permettre l'impression d'une colonne sur deux et le signal VIG* devrait etre appliqué ä la fois au circuit de commande 41 du registre à décalage 40 et à la mémoire 43 pour les besoins de la sélection de la mémoire de données de correction. D'autre part, le microprocesseur 10 devrait obligatoirement informer les circuits de commande de la machine que, dans le mode d'impression grossière demande, la vitesse de fonctionnement devrait être approximativement égale à quatre fois celle réalisée dans le mode d'impression fine, et ce au moyen d'un signal obtenu à partir du signal VIG de la Figure 6, et transmettrait en outre un second signal dont on realiserait, par exemple, la fonction ET pour indiquer l'augmentation de vitesse requise par le microprocesseur.
La presente invention fournit donc une imprimante à projection d'encre capable de varier la résolution des caractères qu'elle imprime tout en effectuant une variation correspondante de la vitesse d'impression, ce résultat pouvant être obtenu en apportant des modifications peu considérables au matériel existant.
Bien que l'on ait décrit dans ce qui précède et représenté sur les dessins les caractéristiques essentielles de l'invention appliquées à un mode de réalisation préféré de celle-ci, il est evident que l'homme de l'art peut y apporter toutes modifications de forme ou de détail qu'il juge utiles, en substituant des moyens par des moyens équivalents dans le cadre de la protection telle que définie par les revendications.
1. Imprimante à projection d'encre continue du type dans lequel un chariot (7) comporte une buse (20) émettant une suite de gouttelettes d'encre selon un débit prédéterminé, une électrode de charge (4) des gouttelettes d'encre et des électrodes de déviation (5) des gouttelettes d'encre, pour effecteur l'impression de caractères sur un support en formant sur celui-ci des colonnes de points, une première résolution prédéterminée de caractères étant définie par un nombre maximum prédéterminé d'éléments d'images par unité de largeur et de hauteur dans un cadre de caractère de dimensions prédéterminées, ladite imprimante étant caractérisée en ce qu'elle comprend:
un générateur de caractères (13) permettant d'engendrer des données représentatives de la charge à appliquer à des gouttelettes sélectionnées faisant partie de I'impression d'une unique colonne d'un caractère, et des moyens de détection (19) permettant d'indiquer à tout moment la position et le sens du mouvement du chariot et d'engendrer un premier signal dit de début d'impression de colonne indiquant l'instant du début de l'impression de chaque colonne d'éléments d'image faisant partie d'un caractère donné;
un dispositif (7a, 7b) d'entrainement du chariot à vitesse variable, un circuit (19) de positionnement des gouttelettes d'encre pour recevoir lesdites données et ledit premier signal et qui est couplée à ladite électrode de charge (4) pour appliquer une charge aux gouttelettes d'encre en fonction desdites données pour former un unique caractère présentant une première résolution et à une première vitesse du chariot, les moyens suivants étant employés pour obtenir une augmentation de la vitesse d'impression sur ledit support tout en maintenant le débit d'encre ä une valeur prédéterminée;
un premier circuit (31, 32) permettant de recevoir un second signal indiquant une modification de la vitesse de formation et de la résolution d'un caractère, circuit comprenant des moyens (32) permettant d'engendrer un troisième signal lors de la réception dudit second signal pour modifier la vitesse dudit dispositif d'entrainement de teile sorte qu'il entraîne le chariot à une seconde vitesse superieure à la première, et
un second circuit (33) permettant, en réponse audit second signal, de former un caractère donné á une seconde résolution et à une seconde vitesse de déplacement du chariot qui est supérieure à la première.
2. Imprimante à projection d'encre selon la revendicaton 1, caractérisée en ce que ledit second circuit comprend des moyens (33h) rendant inopérants certains signaux de début d'impression de colonne choisis.
3. Imprimante á projection d'encre selon la revendication 1, caractérisée en ce que ledit second circuit comprend des moyens (33h) permettant, en réponse audit second signal et audit premier signal de début d'impression de colonne, de supprimer régulièrement ou periodiquement le signal de début d'impression de colonne.
4. Imprimante à projection d'encre selon la revendication 2, caractérisée en ce qu'elle comprend des moyens (34) permettant d'éviter ledit second circuit, de telle sorte que ledit premier signal puisse être appliqué audit circuit (19) de positionnement de gouttelettes d'encre en l'absence dudit second signal.
5. Imprimante á projection d'encre selon l'une des revendications 1 -4, caractérisée en ce qu'elle comprend des moyens (35) permettant d'appliquer ledit troisième signal audit circuit (19) de positionnement des gouttelettes d'encre, et des moyens (4) permettant de supprimer des données représentant la charge à appliquer á une gouttelette sur deux faisant partie de l'impression d'une unique colonne.
1. Tintenstrahldrucker mit fortlaufender Tintenstrahlabgabe, in dem der Wagen (7) eine eine Folge von Tintentröpfchen mit einem vorbestimmten Fluß abgebende Düse (20), eine Ladeelektrode (4) der Tintentröpfchen und Ablenkelektroden (5) der Tintentröpfchen aufweist, um die Aufzeichnung von Zeichen auf einem Aufzeichnungsträger durch Bildung einer Spalte von Punkten durchzuführen, wobei eine erste vorbestimmte Zeichenauflösung von einer höchsten Anzahl von Bildelementen in jeder Breiteneinheit und Höheneinheit innerhalb eines Zeichenrahmens mit vorbestimmten Abmessungen festgelegt ist, wobei der Tintenstrahldrucker dadurch gekennzeichnet ist, daß er aufweist:
einen Zeichenerzeuger (13) zur Erzeugung von Daten, die der zu ausgewählten, zu der Aufzeichnung einer einzelnen Zeichenspalte gehörigen Tintentröpfchen zu versehenden Ladung entsprechen, und Abtastmittel (19) zur Angabe der Lage und der Bewegungsrichtung des Wagens in jeder Zeit und zur Erzeugung eines ersten, als »Spaltenaufzeichnungsbeginn« genannten Signals, das den Zeitpunkt des Aufzeichnungsbeginns jeder Spalte von zu einem bestimmten Zeichen gehörigen Bildelementen anweist;
eine Einrichtung (7a, 7b) zum Antrieb des Wagens mit einer variablen Geschwindigkeit, eine Positionierungsschaltung (19) der Tintentröpfchen zur Aufnahme der Daten und des ersten Signals, die mit der den Tintentröpfchen mit einer Ladung versehenden Ladeelektrode (4) in Abhängigkeit von den Daten zur Bildung eines einzelnen einer ersten Auflösung entsprechenden Zeichens mit einer ersten Wagengeschwindigkeit gekoppelt ist, wobei die folgenden Mittel zur Erhöhung der Aufzeichnungsgeschwindigkeit auf dem Aufzeichnungsträger angewendet sind, indem der Fluß der Tintentröpfchenabgabe bei demselben vorbestimmten Wert bleibt;
- eine erste Schaltung (31, 32) zur Aufnahme eines zweiten, eine geänderte Geschwindigkeit der Bildung und der Auflösung eines Zeichens anweisenden Signals, welche Schaltung Mittel (32) zur Erzeugung eines dritten Signals bei der Aufnahme des zweiten Signals aufweist, um die Geschwindigkeit der Wagenantriebsgeschwindigkeit so zu ändern, daß sie den Wagen mit einer zweiten höheren als der ersten Geschwindigkeit antreibt,
- eine zweite Schaltung (33), die im Ansprechen auf dem zweiten Signal es gestattet, ein bestimmtes Zeichen mit einer zweiten Auflösung und mit einer zweiten höheren als die erste Wagenantriebsgeschwindigkeit zu bilden.
2. Tintenstrahldrucker nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Schaltung Mittel (33a) aufweist, die bestimmte ausgewählte Signale des Spaltenaufzeichnungsbeginns unwirksam machen.
3. Tintenstrahldrucker nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Schaltung Mittel (33h), die im Ansprechen auf dem zweiten Signal und dem ersten Signal des Spaltenaufzeichnungsbeginns es gestatten, regelmäßig oder periodisch das Signal des Spaltenaufzeichnungsbeginns abzuschaffen.
4. Tintenstrahldrucker nach Anspruch 2, dadurch gekennzeichnet, daß er Mittel (34) zum Umgehen der zweiten Schaltung aufweist, so daß das erste Signal zu der Schaltung (19) zum Positionieren der Tintentröpfchen zugeführt werden kann, wenn das zweite Signal fehlt.
5. Tintenstrahldrucker nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß er Mittel (35), um das dritte Signal zu der Schaltung (19) zum Positionieren der Tintentröpfchen zuzuführen, und Mittel (4), um der jedem zweiten zu der Aufzeichnung einer einzelnen Spalte gehörigen Tintentröpfchen zu versehenden Ladung entsprechende Daten zu vermeiden, aufweist.
EP79103926A 1978-11-13 1979-10-12 Tintenstrahldrucker mit mehreren Geschwindigkeitsstufen Expired EP0013296B1 (de)

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CA1115326A (en) 1981-12-29
AU5210279A (en) 1980-05-22
IT7927152A0 (it) 1979-11-09
IT1165367B (it) 1987-04-22
DE2966871D1 (en) 1984-05-10
AU526048B2 (en) 1982-12-16
ES485757A1 (es) 1980-07-01
EP0013296A2 (de) 1980-07-23
BR7907325A (pt) 1980-07-15
JPS5567878A (en) 1980-05-22
US4216480A (en) 1980-08-05
EP0013296A3 (en) 1981-01-07

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