EP0085598B1 - Verfahren zum Drucken von Punkten auf thermoempfindlichem Papier mit einem Thermodrucker und Drucker zur Verwendung dieses Verfahren - Google Patents

Verfahren zum Drucken von Punkten auf thermoempfindlichem Papier mit einem Thermodrucker und Drucker zur Verwendung dieses Verfahren Download PDF

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Publication number
EP0085598B1
EP0085598B1 EP83400122A EP83400122A EP0085598B1 EP 0085598 B1 EP0085598 B1 EP 0085598B1 EP 83400122 A EP83400122 A EP 83400122A EP 83400122 A EP83400122 A EP 83400122A EP 0085598 B1 EP0085598 B1 EP 0085598B1
Authority
EP
European Patent Office
Prior art keywords
dots
printed
printing head
resistors
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83400122A
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English (en)
French (fr)
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EP0085598A1 (de
Inventor
Bernard Gimel
Christian Defay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0085598A1 publication Critical patent/EP0085598A1/de
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Publication of EP0085598B1 publication Critical patent/EP0085598B1/de
Expired legal-status Critical Current

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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control

Definitions

  • the present invention relates to a process for printing dots on a thermosensitive paper by a thermal printer and a thermal imprimate implementing this process.
  • thermosensitive paper using a thermal printer, the head of which comprises N resistances spaced twice the pitch of the dot to be printed and aligned in the direction of the line to be printed.
  • the operation of printing a line with 2 N dots takes place in two stages.
  • the print head is kept stationary and the resistors corresponding to the dots to be printed are heated.
  • the print head is moved one step in the direction of the line in question so that the resistors corresponding to the locations of the points of the line remaining to be printed are heated.
  • the instants of heating the resistors are separated by the travel times of the print head and of movement of the paper under the print head in order to position the head on the new line to print. Thanks to this process the printing time of a line is constant and it is relatively convenient to synchronize the reception of information with the device which sends it.
  • the information relating to a line can come from any device such as computer peripheral controllers and, when it arrives at a variable rate, it is necessary to provide devices for memorizing this information using, for example, example, from a buffer memory, in order to then transfer the stored information to the printer's printing device.
  • the size of the storage devices or of these buffer memories is determined, on the one hand, as a function of the number of information or maximum points that can be received per unit of time, and on the other hand, as a function of the printing speed. of the printer.
  • the size of the memories used will be all the greater the slower the printing speed relative to the speed of the information received.
  • the invention aims to further increase the printing speed of thermal printers.
  • the subject of the invention is a process for printing dots on thermosensitive paper by a thermal printer comprising, a print head formed by N heating resistors regularly spaced apart and aligned in the direction of the line to be printed, signal input devices representing the points to be printed, means for memorizing the signals received by the input devices as well as control means for moving the print head and heating the resistors corresponding to the points to printing, the method consisting in a first step, heating the resistors corresponding to the locations of the dots to be printed on a line located directly facing these resistors and in a second step shifting the print head to heat the resistors again of the head corresponding to the locations of the points of the line remaining to be printed, characterized in that it also consists in prohibiting the die placing the print head and authorizing the heating of the resistors corresponding to the dots remaining to be printed during the second step when, the number of dots to be printed stored inside the storage means, exceeds a determined number of dots , to prevent the number of points to be memorized from exceeding the storage
  • the subject of the invention is also a thermal printer implementing the above-mentioned method comprising, a print head formed of N heating resistors aligned in the direction of the line to be printed, signal input devices representing the dots to be printed, means for memorizing the signals received by the input devices as well as control means for moving the print head and heating the resistors corresponding to the dots to be printed, characterized in that it comprises means inhibiting means for controlling the movement of the print head when the number of dots to be printed stored inside the storage means exceeds a predetermined number of dots to avoid overflow of the capacity of the storage means as well as the means for authorizing heating the resistors corresponding to the points remaining to be printed, this while the inhibiting means of the control means and the movement of the print head have started.
  • FIG. 1 represents the printing device of the thermal printer according to the invention associated with its control device.
  • FIG. 2 represents a time diagram representing an operation of the printer when there is no risk of overflowing of the storage means.
  • FIG. 3 is a time diagram representing the operation of the printer when there is a risk of overflow of the means of memorization.
  • the printing device represented in FIG. 1 comprises a printing head 1, a control member 2, storage means 3 and an input / output device 4, represented inside dotted lines.
  • the print head 1 consists of a support 5, an electrode holder 6, and guide elements 7, 8 in translation of the electrode holder 6.
  • the guide elements 7 and 8 rest on the support 5.
  • the holder electrode consists of a slide 9 having ends 10 and 11.
  • the electrode holder 6 also comprises N protruding electrodes 12, at 12 N which are arranged along the long longitudinal axis of the slide and which consist of resistors R, at R N. These electrodes are located opposite a heat-sensitive printing paper which is driven, in a known manner and therefore not shown, by a device for stepping the paper step by step to ensure the printing of the lines of information to appear on the paper.
  • the slider 9 comprises a hinge pin 13.
  • the slider 9 is limited in its movement also in translation in one direction, by a stop 14 resting on the support 5 and on which the end 10 of the slider 9 rests when that -this is in the rest position and in the other direction, by a spring 15 disposed between the end 11 of the slide 9 and the support 5.
  • An electromagnet 16 is fixed on the support5 so as to act on a lever, articulated on an articulation axis 17 integral with the support 5 and composed of the arms 18 and 19 located on either side of the articulation axis 17, so that the arm 18 can be attracted by the electromagnet 16
  • the end of the arm 19 is articulated on the articulation axis 13 of the slide 9.
  • the controller 2 comprises a shift register 21, a sequencer constituted by a clock 22, a counter 23 and a rocker 24.
  • the controller also includes heating amplifiers 25 1 to 25 N each connected at one end respecting the resistors R 1 to R N of the print head so as to supply current to these resistors and to heat them.
  • a control amplifier 26 ensures the control of the electromagnet 16.
  • the shift register 21 comprises 2N rockers which can be loaded in parallel by the binary signals arriving on its parallel inputs 1, the loading control being ensured in synchronism with the signal H of the clock 22, applied to its input C K and a binary level 1 logic signal applied to its input T.
  • the shift of the binary signals stored inside the shift register 21 is ensured by the application , in synchronism with the signal H applied to its input C K , of a logic level 1 binary signal at the input DEC of the shift register 21.
  • the transfer of the binary signals present on the input 1 inside the shift register 21 is produced using the two AND gates 27, 28 and the OR gate 29.
  • the output of the OR gate 29 is connected to the input T of the shift register 21 and its two inputs are connected respectively exits of gates ET 27 and 28.
  • the AND gate 27 includes three inputs, a first input is connected to the output Q 1 of the counter 23, a second input is connected to the output ⁇ 2 of the counter 23 and a third input receives the "full" information from the storage means 3.
  • the AND gate 28 includes two inputs, a first input is connected to the output Q 3 of the rocker 24 and a second input receives the "full" information from the storage means 3.
  • the command to shift the signals stored at the inside the shift register 21 is provided by an offset control logic constituted by the AND gates 30, 31 and of the OR gate 32.
  • the output of the OR gate 32 is connected to the input DEC of the shift register 21 and its two inputs are connected respectively to the output of the AND gate 30 and to the output of the AND gate 31.
  • the AND gate 30 comprises three inputs, the first input is connected to the output Q 1 of the counter 23, the second input is connected to the O2 output of counter 23 and l at the third input receives the "full" information from the storage means 3.
  • the AND gate 31 includes two inputs, the first input receives the "full" information from the storage means 3 and the second input is connected to the output Q 3 of the rocker 24.
  • the outputs of odd rows Q 1 to Q 2n-1 of the shift register 21 are respectively connected to the inputs of the AND gates 33 1 to 33 N whose outputs are respectively connected to the inputs of the heating amplifiers 25 1 at 25 N.
  • AND gates 33 1 to 33 N control the heating amplifiers when they are controlled, on their second input by a control logic consisting of AND gates 34, 35, NAND gate 36 and OR gate 37 and on their third input by the signal H coming from the clock 22.
  • the output of the OR gate 37 is applied to the second input of the AND gates 33 1 to 33 N.
  • the OR gate 37 comprises three inputs connected respectively to the outputs of the AND gates 34, 35 and of the NAND gate 36.
  • the AND gate 34 comprises three inputs, a first input is connected to the output 0 1 of the counter 23, the second input is connected to output 0 2 of counter 23 and the third input receives "full" information from storage means 3.
  • Gate AND 35 also includes three inputs, the first input is connected to output Q 1 of the counter 23, a second input is connected to the output Q 2 of the counter 23 and the third input receives the "full” information from the storage means 3.
  • the NAND gate 36 comprises two inputs, a first input receives the information "full” from the storage means 3 and the second input is connected to the output of the clock 22.
  • the control amplifier 26 of the electromagnet 16 is controlled by the AND gate 38.
  • the door ET 38 has two inputs connected respectively to the output Q 1 of counter 23 and at the output delivering the "full" information from the storage means 3.
  • the progression of the counter 23 is ensured by the gate 39, one input of which is connected to the output of the clock 22 and the other input of which receives the information " full "from the storage means 3.
  • the rocking of the rocker 24 is ensured by the door 40, one input of which is connected to the output of the clock 22 and the other inverting input of which receives the information" pT ⁇ in "from storage means 3.
  • the storage means 3 consist of buffer memories 41 and 41 bis, organized in several words of 2N bits of information each corresponding to the number of dots that can be printed on a line of the printer paper.
  • the information input from memory 41 is connected to the parallel outputs of a register 42 which stores the bits of information received by the printer corresponding to the printing of 2N dots on a line.
  • the memories 41 and 41bis are organized in the so-called "FIFO" mode which is an abbreviation of the American term "First in, First out” according to which the information which leaves the memory is found in the order they had at the time of their entry.
  • These memories have a status indicator which takes the logical state 1. when the number of information words stored inside the memory has reached the maximum capacity for memorizing the latter. In the case of FIG.
  • the indication of the state of the memory 41 bis is indicated by the signal "pTein” which has logic level 1 when the memory 41 bis is not completely filled and is at logic 0 when this memory is full.
  • the "full” information is reversed by the inverter 43 to deliver the “full” information.
  • the "full" status indications of memory 41 bis and “full” of the inverter 43 are used as means inhibiting the control logic described above.
  • the input / output device 4 is constituted, within the framework of FIG. 1, by a modulator / demodulator 44 which delivers the information relating to the dots to be printed, in a binary coded form in series, intended for the input of the register 42 of the storage device 3.
  • the operation of the device which has just been described is as follows.
  • the information comes to the printer at the input of the modulator / demodulator 44.
  • the modulator / demodulator 44 delivers a series of binary signals each representing the state of a point of the line to be printed and having the state 0 or l state 1 according to whether the corresponding point must be blackened or must remain white. These signals are transmitted in series to the entry of register 42 to be then transferred into memory 41 each time 2N signals representing 2N points of a line have been stored in register 42.
  • the words of 2N signals thus formed are transferred from in a manner known per se successively in the memory 41 then in the memory 41bis in order to be applied, successively, to the input 1 of the shift register 21 in the order of their arrival.
  • a risk of overflow is signaled by the state of an area of the memory 41 bis which takes logic level 1 when the number of words memorized inside the memory 41 bis reaches the maximum capacity for memorizing them. , this situation being expressed by the appearance of a signal of logic level 0 on the output called "full" of the memory 41 bis. Depending on state 0 or state 1 of the "full" output, two types of situation can occur.
  • the print head is then controlled in normal mode as shown in the timing diagram of FIG. 2.
  • the clock signals H delivered by the clock 22 are represented on the first line
  • the second line represents the evolution of the output signal Q 1 of the counter 23
  • the second line represents the evolution of the signal Q 2 leaving the counter 23
  • the fourth line represents the instants T i of command, on the input T of the register 21, of the transfer of the information presented on its input I
  • the fifth line represents the instants DEC of command, on the input DEC of the register 21 , of the shift to the left of the 2N bits of information stored inside the register 21.
  • the sixth, seventh and eighth lines respectively represent the instants R of return or rest of the print head on its stop, the instants Heating CH electrodes and the instants D of displacement of the print head.
  • the print head only blackens the dots on the line with an odd order number.
  • the printing cycle begins with a transfer of the 2N signals present at the input 1 of the shift register 21, in the shift register 21, at the instants T i .
  • Each instant T i is defined by the logic level 1 appearing at the output of the OR gate 29 when the outputs 0 1 and Q 2 of the counter 23 have the values 1 and 0 respectively and when the clock signal H has the high level in FIG. 2.
  • the heating of the resistances of the electrodes corresponding to the points which must be blackened on the line to be printed takes place an instant later when simultaneously the outputs Q 1 and Q 2 of the counter 23 and the signal H delivered by the clock 22 have the value logical 1.
  • the 2N bits of information contained in the register 21 are then shifted one step to the left, in the shift register 21, at the next clock peak, at the fall of the signal Q 1 leaving the counter 23, while , the signal G 2 leaving the counter 23 remains at the logic value 1.
  • the displacement D of the electrode holder then takes place by compressing the spring 15 for the entire duration of the signal Q 1 delivered by the counter 23.
  • the heating of the resistors corresponding to the points remaining to be printed is controlled at the end of the displacement of the electrode holder 23 when simultaneously the signals 0 1 and O2 leaving the counter 23 have the value 0 logic and the signal H delivered by the clock 22 has the value 1 logic.
  • a second type of situation can arise when a risk of overflow is signaled by the state 0 of the "full" signal.
  • This signal will then act as a means of inhibiting the means for controlling movement of the print head.
  • the supply of the electromagnet 16 is no longer carried out due to the application of the signal "full” on the corresponding input of the AND gate 38.
  • the progression of the counter 23 n is no longer achieved.
  • the synchronization of the commands of the print head is replaced by the tilting of the rocker 24 which changes state at the rate of the signal H of the clock 22 validated by the door 40.
  • the evolution of the output Q 3 of the rocker 24 is shown in Figure 3, this signal taking the logic value 1 every two clock ticks.
  • the printing cycle of a line on paper has a duration corresponding to two clock periods whereas in the case of the operating mode shown in figure 2 the printing cycle has takes place during four clock cycles.
  • the result is that, two neighboring black dots which normally had to be blackened, are replaced, within the framework of the operation represented in FIG. 3, by a single but wider point, which compensates for the loss of definition.
  • this loss of definition is compensated by an appreciable gain in printing time which makes it possible to considerably reduce the size of the storage devices.
  • the advance of the paper under the print head can be carried out during the instants T i of information transfer in the register 21. As the instants T i are inserted (FIG. 3) between the instants of heating of the electrodes, the risks of making streaks on the paper when it moves are eliminated.
  • the risks of overflow of the storage means may be signaled by any other device than that described above, consisting for example of having the information words or signals received by the storage means counted by a counter of the microprocessor during determined time periods and depending on the number obtained to allow or prohibit movement of the print head.

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  • Electronic Switches (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (6)

1. Verfahren zum Drucken von Punkten auf einem wärmeempfindlichen Papier mit einem Wärmedrucker, der einen Druckkopf (1) bestehend aus N Heizwiderständen, die fluchtend in Richtung der zu druckenden Zeile angeordnet sind, Eingangsvorrichtungen (4) für die Signale, die die zu druckenden Punkte darstellen, Mittel (3) zum Speichern der von den Eingangsvorrichtungen erhaltenen Signale sowie Steuermittel (2) für das Verschieben des Druckkopfes und das Heizen der Widerstände entsprechend den Positionen der zu druckenden Punkte aufweist, wobei das Verfahren in einer ersten Stufe darin besteht, die Widerstände zu heizen, die den Positionen der zu druckenden Punkte einer direkt gegenüber diesen Widerständen liegenden Zeile entsprechen, und in einer zweiten Stufe darin, den Druckkopf zu verschieben, um wiederum die Widerstände des Kopfes zu heizen, die den Positionen der Punkte der Zeile entsprechen, die noch gedruckt werden sollen, dadurch gekennzeichnet, daß es ebenfalls darin besteht, das Verschieben des Druckkopfes zu verbieten und das Heizen der den während der zweiten Stufe verbleibenden zu druckenden Punkten entsprechenden Widerstände zu erlauben, wenn die Anzahl der zu druckenden Punkte, die in Speichermitteln gespeichert sind, eine bestimmte Punktzahl überschreitet, um zu verhindern, daß die Zahl der zu speichernden Punkte die Speicherkapazität der Speichermittel überschreitet.
.2. Wärmedrucker mit einem Druckkopf (1) bestehend aus N Heizwiderständen, die in Richtung der zu druckenden Zeile fluchtend angeordnet sind, einer Eingangsvorrichtung (4) für Signale, die die zu druckenden Punkte repräsentieren, Mitteln (3) zur Speicherung der von den Eingangsvorrichtungen erhaltenen Signale sowie Steuermitteln (2) für das Verschieben des Druckkopfes und das Heizen der den zu druckenden Punkten entsprechenden Widerstände, dadurch gekennzeichnet, daß er Mittel (38, 4lbis) zum Sperren der Steuermittel aufweist, von denen der Druckkopf verschoben wird, wenn die Anzahl der in den Speichermitteln (3) gespeicherten zu druckenden Punkte eine vorbestimmte Anzahl von Punkten überschreitet, um ein Überschreiten der Kapazität der Speichermittel zu verhindern, sowie Mittel zum Autorisieren des Heizens der den verbleibenden zu druckenden Punkte entsprechenden Widerstände, wenn die Mittel zum Sperren der Steuermittel zum Verschieben des Druckkopfes tätig geworden sind.
3. Wärmedrucker nach Anspruch 2, dadurch gekennzeichnet, daß die Sperrmittel vom Zustand eines Speicherbereichs innerhalb der Speichermittel sowie von Mitteln (38) zum Verhindern der Bewegungen des Druckkopfes gebildet werden, die auf den Zustand des Speicherbereichs reagieren.
4. Wärmedrucker nach Anspruch 2, dadurch gekennzeichnet, daß die Sperrmittel von einem Zähler der von den Eingangsvorrichtungen während einer bestimmten Zeitdauer erhaltenen Signale sowie von Mitteln gebildet werden, die die Bewegungen des Druckkopfes verbieten, wenn die erhaltene Summe einen vorbestimmten Wert überschreitet.
5. Wärmedrucker nach einem beliebigen der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die Mittel zum Verbieten der Bewegungen des Druckkopfes sich innerhalb der Steuermittel (2) befinden.
6. Wärmedrucker nach einem beliebigen der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Steuermittel (2) aus einem Mikroprozessor bestehen.
EP83400122A 1982-01-29 1983-01-19 Verfahren zum Drucken von Punkten auf thermoempfindlichem Papier mit einem Thermodrucker und Drucker zur Verwendung dieses Verfahren Expired EP0085598B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8201451 1982-01-29
FR8201451A FR2520671A1 (fr) 1982-01-29 1982-01-29 Procede d'impression de points sur un papier thermosensible par une imprimante thermique et imprimante mettant en oeuvre ce procede

Publications (2)

Publication Number Publication Date
EP0085598A1 EP0085598A1 (de) 1983-08-10
EP0085598B1 true EP0085598B1 (de) 1986-06-11

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EP83400122A Expired EP0085598B1 (de) 1982-01-29 1983-01-19 Verfahren zum Drucken von Punkten auf thermoempfindlichem Papier mit einem Thermodrucker und Drucker zur Verwendung dieses Verfahren

Country Status (5)

Country Link
US (1) US4500891A (de)
EP (1) EP0085598B1 (de)
JP (1) JPS58132575A (de)
DE (1) DE3363979D1 (de)
FR (1) FR2520671A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5717837A (en) * 1994-06-08 1998-02-10 Asahi Kogaku Kogyo Kabushiki Kaisha Thermal printer and thermal printer head driving system
JPH07329338A (ja) * 1994-06-08 1995-12-19 Kyocera Corp サーマルプリンタおよびサーマルプリンタ駆動方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1000641B (it) * 1973-12-28 1976-04-10 Olivetti & Co Spa Unita di stampa elettrotermica di tipo perfezionato
US4224869A (en) * 1977-06-28 1980-09-30 Enertec Parallel line printer
US4300142A (en) * 1980-02-15 1981-11-10 Northern Telecom Limited Thermal printer
US4409599A (en) * 1980-10-27 1983-10-11 Casio Computer Co., Ltd. Printing control device for thermal printer

Also Published As

Publication number Publication date
JPS58132575A (ja) 1983-08-06
US4500891A (en) 1985-02-19
FR2520671B1 (de) 1984-03-09
FR2520671A1 (fr) 1983-08-05
EP0085598A1 (de) 1983-08-10
DE3363979D1 (en) 1986-07-17

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