EP0638428A1 - Thermisches Druckgerät mit zeilenartigem Kopf - Google Patents

Thermisches Druckgerät mit zeilenartigem Kopf Download PDF

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Publication number
EP0638428A1
EP0638428A1 EP94401789A EP94401789A EP0638428A1 EP 0638428 A1 EP0638428 A1 EP 0638428A1 EP 94401789 A EP94401789 A EP 94401789A EP 94401789 A EP94401789 A EP 94401789A EP 0638428 A1 EP0638428 A1 EP 0638428A1
Authority
EP
European Patent Office
Prior art keywords
printing
memory
register
activation
printing apparatus
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.)
Granted
Application number
EP94401789A
Other languages
English (en)
French (fr)
Other versions
EP0638428B1 (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
Original Assignee
Sagem SA
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Filing date
Publication date
Application filed by Sagem SA filed Critical Sagem SA
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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    • 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 line head thermal printing apparatus, such as a fax machine or even a simple printer.
  • a "line" thermal print head is used to print almost all of the dots on a line, thereby achieving high print speed.
  • the head Used for example in a fax machine, the head includes a large number of heating elements which carry out thermal printing under the control of as many activation bits. These bits are memorized, the time of printing a line, in a shift register with as many outputs individually controlling the heating elements. The points of the line could then, if this is the case, be printed simultaneously, according to the activation bits.
  • the register controlling the heating elements is logically divided into blocks which are activated one after the other to print line segments, or portions, together constituting the line to be printed.
  • Such an arrangement correspondingly multiplies the printing time of a line, which is detrimental to the aim which is, by line printing, of obtaining a high printing speed.
  • the present invention aims to be able to increase this printing speed.
  • a line head thermal printing apparatus comprising a plurality of printing heating elements arranged for printing, under the control of individual activation means and by means of memory points of a printing register, successive lines of points on a printing medium driven in scrolling against the head, apparatus characterized in that it comprises means of '' individual writing of memory points.
  • the duration of heating of each heating element can be modulated, that is to say that the head makes it possible to restore black dots whose size depends on this duration and which appear, with their periphery remaining white, as adjustable intensity gray.
  • the write addressing means prefferably includes a memory point addressing demultiplexer.
  • the apparatus may include means for controlling write addressing means arranged to receive signals as input. respectively representative of gray intensities of the points to be printed.
  • the addressing and activation control means can be arranged to simultaneously manage the heating duration settings of several printing elements.
  • the thermal printing apparatus of the invention comprises, in its first embodiment, a thermal head 1 shown in FIG. 1, of which a row of 1,728 printing heating elements, generally referenced 2, cooperates with an ink ribbon not shown thermal transfer printing, applied to a printing medium consisting of paper, driven against the head 1.
  • the printing elements 2 are connected to a supply wire 3 in +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", of a print buffer register 5 with parallel inputs and outputs comprising an ordered row of 1728 such memory points 6.
  • a demultiplexer circuit 10 has eleven address inputs, referenced 11, and 1,728 outputs respectively linked to 1728 clock inputs 7 belonging respectively to 1728 memory points 6.
  • the 1728 memory points 6 respectively comprise 1728 data bit inputs 8A connected to a common link 8.
  • An input 9 is provided here, connected to all the memory points 6, allowing all of them to be reset simultaneously, that is to say ie their forcing in the same predetermined state, here a logic level 0, called 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 produced by means of integrated circuits, in TTL or CMOS technology, of the type 7474 while the demultiplexer 10 can, likewise, be produced by means of several integrated circuits of the type 74154 or 74HC154 and a logic for selecting only one of them, acting on an address input then serving as a validation input, the corresponding outputs of circuit 74 (HC) 154 then being unused. It could have been provided for flip-flops of type JK, divider by two, and not flip-flops "D", which would have avoided the need for the data link 8 since each addressing of such a flip-flop divider would be enough to make it change d 'state.
  • a corresponding address in the row is applied for a short time to the address inputs 11, the link 8 having previously been set to logic level 1 (FIG. 2).
  • the output of the demultiplexer 10 connected to the clock input 7 of the memory point 6 of the heating element 2 considered provides a pulse during the period of application of the address to the address inputs 11, which has for effect of opening a door, not shown, of individual activation of a heating element 2, which reads the logic level of the data link 8 and controls the storage, in the point memory 6 concerned, of a bit having logic level 1 present on the data link 8.
  • each memory point 6 is thus an activation bit for the heating elements 2, which can have two states, namely an active state, here the logic level 1, and an inactive state, here the logic level 0.
  • FIG. 2 which is a time diagram of the above signals
  • 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 control pulses appearing from one period T1-T4 to the other pass back 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 clock signal 7.
  • the periods T1-T4 are limited to a few tens of nanoseconds, which makes it possible to order all of the memory points 6 in much less time than the 10 milliseconds provided for by the standards for printing a line.
  • the setting of the duration of activation of each heating element 2 can thus be carried out by sending an activation command followed, after the desired duration, by sending a deactivation command returning to 0 the activation bit.
  • the reset link 9 makes it possible, if desired, to simplify the sending of the commands from register 5, by providing for simultaneously deactivating all the activation bits, their activation instant being determined accordingly.
  • all the bits of the printing register 5 could be simultaneously put into the active state at the start of line printing, even if it means deactivating them individually almost instantaneously if they correspond to white dots, or, if not, after the desired printing time.
  • the adjustment of the duration of activation of the heating elements 2 makes it possible to choose the temperature reached by them, as well as the time of the thermal diffusion towards the ink and the transfer time when the ink has melted.
  • the adjustment of the activation time makes it possible to modulate the quantity of ink deposited on the paper at each point, that is to say to obtain black dots of reduced size each surrounded by an area. remaining white, which simulates gray, of independent intensities from one point to another.
  • the circuit 31 of FIG. 3 controls the multiplexer 10 by transmitting the desired addresses in a timely manner.
  • a reception link 32 provides a series of binary signals representing numbers, coded in this example, arranged according to the order of the dots to be printed, respectively representative of the gray intensities of the dots of a line to be printed.
  • each number is proportional to the desired gray intensity
  • the number "zero" indicating the presence of a white point
  • the coding corresponds to conventional binary coding.
  • the circuit 31 stores this series of numbers in a shift register 33 with parallel outputs and then reads them successively in a 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 be printed.
  • the address of the counter 35 which corresponds to the relative position of the number in the row, that is to say the position or address of the memory point 6 considered, is applied to the address inputs 11 of the demultiplexer 10, while the link 8 is brought to level 1 by the circuit 31, to activate the corresponding memory point 6, as explained above.
  • the process continues until the last number.
  • the instants of activation of the memory points 6, supplied by the time base 39, could be memorized with each number of the register 33, but in this case, being very close, only the instant TA of the last activation is noted.
  • the multiplexer 34 continues the partial scan cycles of the register 33 and an arithmetic circuit 37 of the circuit 31 subtracts the stored value TA from the value tj of the current instant, supplied by the time base 39, and compares the result with the corresponding coded number in register 33. In the event that this number is reached or exceeded, a deactivation command is issued, as explained above.
  • a printing register 45 controlling the heating elements in the same way as register 5 of the previous example, comprises 1,728 memory point data entries 46 which, at through gates 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 read circuit 42 of the circuit 41, to the input register 43 and controls the opening of a determined number of doors 44, of determined position, this number of doors being a function coded numbers read from register 43, as explained below.
  • the 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 printing register 45, the presence of non-zero numbers, indicating gray, being marked by double blocks. hatched. A coded number therefore corresponds to a bit of the same address of the printing register 45.
  • FIG. 5 shows in more detail the diagram of FIG. 4.
  • the output of the multiplexer 42 is connected to a transcoder circuit 47 which converts each coded number received into another, non-coded number, of predetermined length, comprising at the start activation bits in state 1, in numbers 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 have to be interposed, with the transcoder circuit 47, between the outputs of the input register 43 and the gates 44.
  • FIG. 6 represents three non-coded 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 bearing 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 sends a stop signal 50 when it reaches a predetermined value N.
  • the signal 50 has the effect of stopping a counter common addressing 51 controlling 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 the counter 51 to a determined address value, of value "one" at the start, and starts a cycle of a reading sequence of the first bits of each uncoded word from memory 48. If the bit read is at "1", this "1" is copied into 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 further sending of "1" to the printing register 45, and the address AS of the last memory point 6 in 1 is memorized by the circuit 52.
  • the circuit 52 then resets the counter 49 to "one" to start a new cycle, relating to the second bits of the non-coded numbers of the memory 48 and, then, sends a command to deactivate the memory points 46, of address "one" to AS, for which the second bit of the non-coded number is in state 0, which is the case for point 46-1.
  • the bits of the next line to be printed are read in the input register 43, to start a new printing.

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  • Electronic Switches (AREA)
  • Cable Accessories (AREA)
  • Measuring Fluid Pressure (AREA)
  • Electric Cable Installation (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
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 true EP0638428A1 (de) 1995-02-15
EP0638428B1 EP0638428B1 (de) 1999-02-17

Family

ID=9449938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401789A Expired - Lifetime EP0638428B1 (de) 1993-08-04 1994-08-03 Thermisches Druckgerät mit zeilenartigem Kopf

Country Status (6)

Country Link
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018762A1 (de) * 1979-04-24 1980-11-12 Oki Electric Industry Company, Limited Thermischer Druckapparat
FR2459591A1 (fr) * 1979-06-19 1981-01-09 Amicel Jean Claude Procede et dispositif de telecopie a sauts de blancs
WO1992000195A1 (en) * 1990-07-02 1992-01-09 Eastman Kodak Company Parasitic resistance compensation for thermal printers
US5099258A (en) * 1989-08-23 1992-03-24 Seiko Instruments Inc. Dot print density regulating circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018762A1 (de) * 1979-04-24 1980-11-12 Oki Electric Industry Company, Limited Thermischer Druckapparat
FR2459591A1 (fr) * 1979-06-19 1981-01-09 Amicel Jean Claude Procede et dispositif de telecopie a sauts de blancs
US5099258A (en) * 1989-08-23 1992-03-24 Seiko Instruments Inc. Dot print density regulating circuit
WO1992000195A1 (en) * 1990-07-02 1992-01-09 Eastman Kodak Company Parasitic resistance compensation for thermal printers

Also Published As

Publication number Publication date
FR2708524B1 (fr) 1995-09-29
DE69416551T2 (de) 1999-09-23
FR2708524A1 (fr) 1995-02-10
ES2129111T3 (es) 1999-06-01
US5748220A (en) 1998-05-05
ATE176770T1 (de) 1999-03-15
EP0638428B1 (de) 1999-02-17
DE69416551D1 (de) 1999-03-25

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