EP0638428B1 - Thermisches Druckgerät mit zeilenartigem Kopf - Google Patents

Thermisches Druckgerät mit zeilenartigem Kopf Download PDF

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Publication number
EP0638428B1
EP0638428B1 EP94401789A EP94401789A EP0638428B1 EP 0638428 B1 EP0638428 B1 EP 0638428B1 EP 94401789 A EP94401789 A EP 94401789A EP 94401789 A EP94401789 A EP 94401789A EP 0638428 B1 EP0638428 B1 EP 0638428B1
Authority
EP
European Patent Office
Prior art keywords
memory
printing
register
addressing
activation
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 - Lifetime
Application number
EP94401789A
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English (en)
French (fr)
Other versions
EP0638428A1 (de
Inventor
Salvador Garcia
Patrick Vegeais
Alain Frederic
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.)
Sagem SA
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Sagem SA
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Publication of EP0638428A1 publication Critical patent/EP0638428A1/de
Application granted granted Critical
Publication of EP0638428B1 publication Critical patent/EP0638428B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a printing apparatus thermal line head, such as a fax machine or even a simple printer.
  • a "line" thermal print head is used for printing almost all the points of a line simultaneously, which achieves high print speed.
  • the head Used for example in a fax machine, the head has a large number of heating elements that print thermal under the command of as many activation bits. These bits are memorized, the time of printing a line, in a shift register with as many commanding outputs the heating elements individually. The points of the line could then be, if that is the case, be printed simultaneously, depending on the activation bits.
  • the register controlling the heating elements is logically cut in blocks which are activated one after the other to print segments, or portions, of line together constituting the line to print.
  • Such an arrangement multiplies the printing time by one line, which harms the intended goal which is, by a line impression, to obtain a high printing speed.
  • the present invention aims to be able to increase this speed printing.
  • a thermal printing apparatus with line head comprising a plurality of heating elements printers arranged to print successive lines of dots on a print medium dragged against the head, the heating elements being, via points memories of a printing register, controlled by individual activation means, apparatus characterized by the fact that the memory points are arranged to be individually deactivated one by one by the addressing means.
  • each heating element can be modulated, that is to say that the head allows to restore black dots whose size depends on this duration and which appear, with their edges remaining white, like grays adjustable intensity.
  • the write addressing means include a memory point addressing demultiplexer.
  • the device may include means for controlling means write addressing arranged to receive input signals respectively representative of gray intensities of dots to print.
  • the means of addressing and activation command can be arranged to simultaneously manage the heating time settings for several printing elements.
  • the thermal printing apparatus of the invention comprises, in its first embodiment, a thermal head 1 shown in Figure 1, including a row of 1728 heating elements printing, generally referenced 2, cooperates with a ribbon thermal transfer printing ink not shown, applied to a print medium consisting of paper, driven scrolling against the head 1.
  • the printing elements 2 are connected to a supply wire 3 at +24 volts and are controlled by individual amplifiers / switches 4 each controlled by its own activation bit stored in a memory point 6 here of the flip-flop type "D", from a print buffer register 5 to parallel inputs and outputs with an ordered row of 1728 such memory points 6.
  • a demultiplexer circuit 10 comprises eleven address entries, referenced 11, and 1,728 outputs respectively connected to 1728 clock inputs 7 belonging respectively at 1728 memory points 6.
  • the 1728 memory points 6 respectively comprise 1728 data bit inputs 8A connected to a common link 8. It an input 9 is here provided, connected to all the memory points 6, allowing the simultaneous reset of all, that is to say their forcing in the same predetermined state, here a logic level 0, says inactive, for which the heating elements 2 are not supplied with current through the amplifiers 4.
  • the flip-flops "D" of the memory points 6 can for example be realized by means of integrated circuits, in TTL technology or CMOS, of type 7474 while demultiplexer 10 can, from even, be realized by means of several integrated circuits of the type 74154 or 74HC154 and a logic of selection of only one of them, acting on an address entry then serving as an entry for validation, the corresponding outputs of circuit 74 (HC) 154 being then unused.
  • JK type flip-flops could have been provided, divider by two, not flip-flops "D", which would have avoided the need for data link 8 since each addressing of such a divider would be enough to make it change state.
  • each memory point 6 is thus a bit activation of the heating elements 2, which can have two states, know an active state, here logic level 1, and an inactive state, here the logic level 0.
  • the address memory point "three" returns to 0 during the period T3, while the address memory point "one” returns to 0 during the period T4.
  • the impulses of order appearing from one period T1-T4 to the other pass to state 0, while in practice the data link 8 remains at the same level during each period T1-T4 and is read, by sampling, by an active edge, here falling, of the signal 7.
  • the periods T1 -T4 are limited to a few tens of nanoseconds, which allows order all memory points 6 in good time less than the 10 milliseconds provided for by the standards for printing a line.
  • Setting the duration of activation of each heating element 2 can thus be carried out by sending an order activation followed, after the desired duration, by sending a deactivation command resetting the bit to 0 activation.
  • amplifiers 4 or the memory points 6 are inverters, or although link 9 allows to force all the bits of the printing register 5.
  • all the bits of the register 5 are simultaneously set to the active state at the start line printing, even if it means deactivating them individually almost instantly if they correspond to white dots, or, if not, after the desired printing time.
  • the adjustment of the activation time allows to modulate the amount of ink deposited on the paper at each point, i.e. get small black dots each surrounded of a remaining white area, which simulates grays, intensities independent from one point to another.
  • the circuit 31 of FIG. 3 ensures the control of the multiplexer 10 by issuing the desired addresses in a timely manner.
  • a reception link 32 provides a series of signals binaries representing numbers, coded in this example, arranged in the order of the dots to be printed, respectively representative of the gray intensities of the points from a line to to print.
  • each number is proportional to the intensity of gray desired, the number "zero" indicating the presence of a point white and the coding corresponds to the classic binary coding.
  • the circuit 31 stores this sequence of numbers in a register with offset 33 with parallel outputs then reads them successively in one partial scanning cycle by means of a multiplexer 34, addressed by a counter 35 advancing at the rate of a time base 39 of period Ti, until finding a number other than zero, indicating a gray to print.
  • the address of counter 35 which corresponds to the relative position of the number in the row, i.e.
  • the multiplexer 34 continues partial scan cycles of register 33 and a arithmetic circuit 37 of circuit 31 subtracts the value TA memorized of the value tj of the current instant, provided by the base 39, and compare the result to the corresponding coded number from register 33. If this number is reached or exceeded, a deactivation command is issued, as explained above.
  • a printing register 45 controlling heating elements in the same way as the register 5 of the previous example, contains 1728 entries of memory point data 46 which through doors 44 are connected to as many outputs of an input register 43 containing, like register 33, a series of binary signals representing arranged numbers, also coded in this example, respectively representative of the gray intensities of the points a line to print.
  • a control circuit 41 is connected by means of a reading 42 of circuit 41, to input register 43 and command the opening of a determined number of doors 44, of position determined, this number of doors being a function of the numbers coded read in register 43, as explained below.
  • Hatched areas indicate blocks of bits transferred simultaneously, the position of the hatched areas of the register 43 corresponding to that of the hatched areas of the register 45, the presence of numbers other than zero, indicating gray, being marked by doubly blocks hatched. A coded number therefore corresponds to a bit of the same address of the printing register 45.
  • Figure 5 shows in more detail the diagram of Figure 4.
  • the output of the multiplexer 42 is connected to a transcoder circuit 47 which converts each coded number received into another number, not coded, of predetermined length, comprising bits at the head activation in state 1, in a number proportional to the intensity of the gray defined by the corresponding coded number, these non-coded numbers being stored in a memory 48.
  • the memory 48 has not been shown in FIG. 4 and would therefore be interpose, with the transcoder circuit 47, between the outputs of the entry register 43 and doors 44.
  • FIG. 6 represents three uncoded numbers, of five bits each, relating to three points 46-1, 46-2 and 46-5, the abscissa axis carrying the rank P of the memory points 46 and the ordinate axis carrying time t .
  • Point 46-1 has only one bit in 1, so that gray will be light, while point 46-2, having a three-bit number in 1, will have a medium gray and point 46-5 , with 5 bits in 1, will be black because activated for the maximum duration X provided.
  • the output of memory 48 also attacks a counter 49 which detects the presence of activation bits in 1 and emits a signal 50 when it reaches a predetermined value N.
  • Signal 50 has the effect of stopping a common addressing counter 51 driving the multiplexer 42 and a demultiplexer 40, equivalent to the demultiplexer 10, connected at output to the printing register 45.
  • a sequencer circuit 52 forces counter 51 to a determined address value, from value "a" at the beginning, and starts a cycle of a sequence of reading the first bits of each uncoded word from memory 48. If the bit read is in “1”, this "1" is copied into the memory point 46 of the same address through the demultiplexer 40. After N such copies, the counter 49 sends the stop signal 50, which stops any new sending of "1" to the printing register 45, and the AS address of the last 6 in 1 memory point is memorized by the circuit 52.
  • Circuit 52 then resets counter 49 to "one" for start a new cycle, relating to the second bits of uncoded numbers from memory 48 and then sends a command to deactivate memory points 46, address "one" to AS, for which the second bit of the uncoded number is at state 0, which is the case for point 46-1.
  • the bits of the line next to be printed are read in the input register 43, to start a new impression.

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  • Electronic Switches (AREA)
  • Electric Cable Installation (AREA)
  • Cable Accessories (AREA)
  • Measuring Fluid Pressure (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (8)

  1. Thermisches Druckgerät mit zeilenartigem Kopf mit einer Anzahl von Heiz-Druckelementen (2), die dafür eingerichtet sind, aufeinanderfolgende Linien von Punkten auf einer zu bedruckenden Unterlage zu drucken, die an dem Kopf (1) vorbeilaufend durchgezogen wird, wobei die Heizelemente unter Zwischenschaltung von Speicherpunkten (6; 46) eines Druckregisters (5; 45) durch individuelle Aktivierungseinrichtungen (7, 8) angesteuert sind, dadurch gekennzeichnet, daß die Speicherpunkte (6; 46) durch die Adressiereinrichtung (10; 40) individuell und einzeln desaktivierbar sind.
  2. Thermisches Druckgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Schreibadressierungseinrichtung einen Demultiplexer (10; 40) zur Adressierung der Speicherpunkte (6; 46) aufweist.
  3. Thermisches Druckgerät nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß das Druckregister (5; 45) einen Steuerungseingang (9) aufweist, um die Speicherpunkte (6) auf ein und denselben vorbestimmten Zustand zu setzen.
  4. Thermisches Druckgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine Steuereinrichtung (31; 41; 47, 48, 49, 51) für die Schreibadressierungseinrichtung (40) vorgesehen ist, die dafür eingerichtet ist, eingangsseitig Signale zu erhalten, welche Grauwerte von zu druckenden Punkten darstellen.
  5. Thermisches Druckgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine Steuerungseinrichtung (31) für die Schreibadressierungseinrichtung (10) vorgesehen ist und daß die Einrichtung zur Steuerung der Aktivierung (7, 8) eine Verbindung (8) aufweist, die an die Speicherpunkte (6) des Registers (5) angeschlossen ist.
  6. Thermisches Druckgerät nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Einrichtungen zur Steuerung der Adressierung und der Aktivierung (31; 41) dafür eingerichtet sind, um gleichzeitig die Regelung der Beheizungsdauer von mehreren Druckelementen (2) zu steuern.
  7. Thermisches Druckgerät nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß eine Leseadressierungseinrichtung (42, 49, 51) vorgesehen ist, die dafür eingerichtet ist, aus einem Eingangsspeicher (43; 48) eine bestimmte Anzahl von Bits zur Aktivierung einer zu druckenden Zeile in einem aktiven Zustand zu lesen, wobei die Steuereinrichtung (51; 52) der Schreibadressierungseinrichtung (40) dafür eingerichtet ist, die genannten Aktivierungsbits unter der Steuerung der Leseadressierungseinrichtung (42, 49, 51) auszuwählen und die Übertragung der Aktivierungsbits vom Eingangsspeicher (43) zum Druckregister (45) zu steuern.
  8. Thermisches Druckgerät nach Anspruch 7, dadurch gekennzeichnet, daß ein Zähler (51) zur gleichzeitigen Steuerung der Leseadressierungseinrichtung (42) und der Schreibadressierungseinrichtung (40) vorhanden ist.
EP94401789A 1993-08-04 1994-08-03 Thermisches Druckgerät mit zeilenartigem Kopf Expired - Lifetime EP0638428B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9309611A FR2708524B1 (fr) 1993-08-04 1993-08-04 Appareil d'impression thermique à tête ligne.
FR9309611 1993-08-04

Publications (2)

Publication Number Publication Date
EP0638428A1 EP0638428A1 (de) 1995-02-15
EP0638428B1 true EP0638428B1 (de) 1999-02-17

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EP94401789A Expired - Lifetime EP0638428B1 (de) 1993-08-04 1994-08-03 Thermisches Druckgerät mit zeilenartigem Kopf

Country Status (6)

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US (1) US5748220A (de)
EP (1) EP0638428B1 (de)
AT (1) ATE176770T1 (de)
DE (1) DE69416551T2 (de)
ES (1) ES2129111T3 (de)
FR (1) FR2708524B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025246A1 (de) * 2007-05-30 2008-12-04 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben einer Thermodruckereinheit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284876A (en) * 1979-04-24 1981-08-18 Oki Electric Industry Co., Ltd. Thermal printing system
FR2459591A1 (fr) * 1979-06-19 1981-01-09 Amicel Jean Claude Procede et dispositif de telecopie a sauts de blancs
JPS58175677A (ja) * 1981-11-09 1983-10-14 Toshiba Corp 感熱ヘツドの駆動方法
JPS6044371A (ja) * 1983-08-20 1985-03-09 Ricoh Co Ltd サ−マルヘツドの駆動方法
JPS6342874A (ja) * 1986-08-08 1988-02-24 Fujitsu Ltd プリンタ
JP2575304B2 (ja) * 1987-03-06 1997-01-22 イーストマン・コダック アジア・パシフィック株式会社 熱転写印刷ヘツド用発熱体駆動装置
US4746941A (en) * 1987-10-13 1988-05-24 Eastman Kodak Company Dot printer with token bit selection of data latching
JPH0379377A (ja) * 1989-08-23 1991-04-04 Seiko Instr Inc プリンタの印字率補正回路
US5053790A (en) * 1990-07-02 1991-10-01 Eastman Kodak Company Parasitic resistance compensation for thermal printers

Also Published As

Publication number Publication date
US5748220A (en) 1998-05-05
FR2708524A1 (fr) 1995-02-10
DE69416551T2 (de) 1999-09-23
EP0638428A1 (de) 1995-02-15
FR2708524B1 (fr) 1995-09-29
DE69416551D1 (de) 1999-03-25
ATE176770T1 (de) 1999-03-15
ES2129111T3 (es) 1999-06-01

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