EP0413413B1 - Drucker mit Thermodruckknopf - Google Patents

Drucker mit Thermodruckknopf Download PDF

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Publication number
EP0413413B1
EP0413413B1 EP90306180A EP90306180A EP0413413B1 EP 0413413 B1 EP0413413 B1 EP 0413413B1 EP 90306180 A EP90306180 A EP 90306180A EP 90306180 A EP90306180 A EP 90306180A EP 0413413 B1 EP0413413 B1 EP 0413413B1
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EP
European Patent Office
Prior art keywords
print
dot
shift
dot print
signals
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
EP90306180A
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English (en)
French (fr)
Other versions
EP0413413A2 (de
EP0413413A3 (en
Inventor
Soichiro C/O Riken Denshi Co. Ltd. Yasunaga
Isamu C/O Riken Denshi Co. Ltd. Watanabe
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.)
Riken Denshi Co Ltd
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Riken Denshi Co Ltd
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Publication date
Application filed by Riken Denshi Co Ltd filed Critical Riken Denshi Co Ltd
Publication of EP0413413A2 publication Critical patent/EP0413413A2/de
Publication of EP0413413A3 publication Critical patent/EP0413413A3/en
Application granted granted Critical
Publication of EP0413413B1 publication Critical patent/EP0413413B1/de
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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 thermal head printer including a thermal print head carrying linearly arrayed dot print elements to which are applied print signals from shift registers undergoing a clock-controlled shift scan and having a number of addresses corresponding to the number of dot elements, and a dot print signal generating circuit for outputting a dot print signal just when the number of clocks pulses, e.g. as counted by a counter, corresponds to the level, e.g., in digitized form, of each of a series, input signals derived, e.g., by sampling a waveform, the printer being adapted to effect simultaneous one-line dot printing in accordance with the dot print signals stored in the shift registers in response to print command signals.
  • the dot print signals are supplied at high velocity to shift registers incorporated into the thermal print head, and the dot print elements may in principle be operated at a corresponding velocity.
  • the present invention provides a thermal head printer capable of enhanced resolving power by an apparent improvement in the response speed of dot print elements by a slight addition of electrical circuitry.
  • the dot print signal D o1 delayed by one shift scanning cycle t is printed, and at the subsequent shift scanning cycle the second interpolation dot print signal D02 delayed by two shift scanning cycles t is printed.
  • the thermal print head effects the printing process at a velocity which is three times as high as the shortest print cycle T with respect to the input waveforms A. Even when each heating time is short, the print element driving process is effected three times during the shortest print cycle T. As a result, the heating time typically increases, thereby carrying out the print with a high resolving power under such condition that any decline in coring properties is compensated.
  • FIG. 2 there is illustrated in schematic fashion the circuitry of the thermal head printer according to one embodiment of the invention.
  • the numeral 10 generally represents a dot print signal generating circuit for converting into a dot print signal an analog waveform signal B to be inputted.
  • the circuit 10 is composed of an A/D converter 11 for digitizing the analog waveform signal B by sampling, a counter 12 for counting the number of clock pulses from clock K for controlling shift scanning, and a digital comparator 13 for outputting as a dot print signal a coincidence signal at a Hi level (logic 1) then the counted number of clock pulses corresponds to the digitised value of the sample of waveform signal B generated by A/D converter 11.
  • a thermal print head generally designated 20 consists of 2048 exothermic elements or dot print elements 21, illustrated as resistors, gates 22 corresponding to elements 21 which open in response to print command signals, a latch circuit 23 for outputting latch signals for the addresses of the respective gates, and a shift register 24 for outputting to the latch circuit the dot print signals corresponding to addresses thereof.
  • Numerals 31 through 33 denote data interpolation shift registers each of 2048 stages, these three shift registers being serially connected with separate parallel outputs.
  • the shift register 31 functions to hold in the associated addresses by shift scanning the Hi level (logic 1) dot print signals applied thereto during each shift scan by the dot print signal generating circuit 10.
  • the shift registers 32 and 33 are arranged to receive at the appropriate addresses dot print signals transferred thereto in sequence from the corresponding stages of the prior shift registers under the control of the clock K.
  • Designated at 34 is an OR gate for inputting the dot print signals received directly from the dot print signal generating circuit 10 and also the delayed dot print signals from the parallel outputs of the three interpolation or delay shift registers 31 through 33.
  • the dot print signal generating circuit 10 takes in the input waveform signals B and then generates, as an instantaneous digitized value corresponding thereto, the dot print signals D o when the number of clock pulses counted by counter 12 is equal to that digitized value.
  • the realtime dot print signals D o from scan 0 are in turn supplied in parallel to the OR gate 34 and the shift register 31. Therefore, the signal D o is outputted in the form of the one-scan delayed dot print signal D o1 from the shift register 31 during the next shift scanning cycle (1) and is then loaded into the shift register 32.
  • signal D0 is also outputted in the form of the two-scan delayed dot print signal D02 from the shift register 32 and is then loaded into the shift register 33.
  • signal D0 is outputted as the three-scan delayed dot print signal D03 from the final shift register 33.
  • the respective output signals from all three registers are applied in parallel to OR-gate 34.
  • each real-time signal is converted in turn into time-delayed counterpart signals as it is replaced by the next following real time signal and so on.
  • the signals D o , D ⁇ 11, D ⁇ 22 and D ⁇ 33 are held in the latch circuit 23 in response to the latch signals generated immediately after each shift scan.
  • the dot print elements 21 receive the latch-held signals and function to effect simultaneous one-line printing.
  • a limit resolving power corresponds to the shortest print cycle of 2048 ⁇ s on the basis of the conventional method, if a normal density is to be secured.
  • the thermal print head 20 itself is of known construction but behaves as if it were a novel thermal print head incorporating interpolation registers.
  • the dot print signal generating circuit can also be constructed in a variety of forms to incorporate, e.g., a CPU for processing the data.

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  • Electronic Switches (AREA)
  • Recording Measured Values (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Common Mechanisms (AREA)

Claims (1)

  1. Thermodruckkopfschaltung, umfassend:
    einen Thermodruckkopf (20), der mit einer Vielzahl linear angeordneter Punkt- oder Matrixdruck-Elemente (21) versehen ist, an die Druckschieberegister (23) zur taktgesteuerten Verschiebungsabtastung angeschlossen sind, und der eine Anzahl von Adressen besitzt, die der Anzahl an Punktelementen (21) entspricht; und
    eine Punktdrucksignalerzeugungsschaltung (10) zum Ausgeben von Punktdrucksignalen, wenn die Anzahl der Taktimpulse von einer Taktrückstellung für jeden Abtastzyklus dem Niveau jedes einer Reihe von Eingabesignalen gleich ist, und wobei der Druckkopf (10) derart angeordnet ist, daß er für jeden Punktdruckverschiebungsabtast-Zyklus einen gleichzeitigen einzeiligen Punktdruck der Punktdrucksignale bewirkt, die in vorbestimmten Adressen der Druckschieberegister durch Verschiebungsabtastung geladen und darin gehalten werden, gekennzeichnet durch:
    eine Vielzahl seriell verbundener Verzögerungsschieberegister (31,32,33), die eine synchrone, taktgesteuerte Verschiebungsabtastung erfahren, in die die Punktdrucksignale, die von der Punktdrucksignalerzeugungsschaltung (10) ausgegeben worden sind, eingegeben werden, wobei jedes solche Register (31,32,33) eine Anzahl von Adressen besitzt, die der Anzahl der Punktdruckelemente entspricht und wirksam ist, um eine Vielzahl aufeinanderfolgender zeitverzogerter Gegenstücke jedes Punktdrucksignals auszugeben; und
    eine ODER-Schaltung (34), an die die zeitverzögerten Gegenstücke der Punktdrucksignale angelegt werden, die von den Verzögerungsschieberegistern (31,32,33) ausgegeben werden, und an die die laufenden Realzeit-Punktdrucksignale angelegt werden, wobei die Zykluszeit des taktgesteuerten Verschiebungsabtastablaufes der Schieberegister nach der Gleichung t ≦ T/ (n+1)
    Figure imgb0003
     eingestellt wird, worin T der kürzeste Druckzyklus ist, der dazu ausreicht, die Punktdrucksignale normalerweise ansprechen zu lassen, und n die Anzahl der seriell verbundenen Verzögerungsschieberegister (31,32,33) ist, und wobei die Ausgangssignale der ODER-Schaltung zu den Druckschieberegistern (34) des Thermodruckkopfes (20) geliefert werden.
EP90306180A 1989-08-18 1990-06-07 Drucker mit Thermodruckknopf Expired - Lifetime EP0413413B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP212716/89 1989-08-18
JP21271689A JP2753632B2 (ja) 1989-08-18 1989-08-18 サーマルヘッドプリンタ

Publications (3)

Publication Number Publication Date
EP0413413A2 EP0413413A2 (de) 1991-02-20
EP0413413A3 EP0413413A3 (en) 1991-08-14
EP0413413B1 true EP0413413B1 (de) 1994-09-21

Family

ID=16627247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90306180A Expired - Lifetime EP0413413B1 (de) 1989-08-18 1990-06-07 Drucker mit Thermodruckknopf

Country Status (4)

Country Link
EP (1) EP0413413B1 (de)
JP (1) JP2753632B2 (de)
AT (1) ATE111817T1 (de)
DE (1) DE69012714T2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07290707A (ja) * 1994-04-22 1995-11-07 Canon Inc 記録ヘッド及び該記録ヘッドを用いたプリンタ装置及びプリント方法
CN112590400B (zh) * 2020-12-11 2022-01-14 南阳柯丽尔科技有限公司 热敏打印机控制方法、装置、热敏打印机和介质
CN112590402B (zh) * 2020-12-11 2022-02-22 南阳柯丽尔科技有限公司 热敏打印机控制方法、装置、热敏打印机和介质
CN112590401B (zh) * 2020-12-11 2022-02-22 南阳柯丽尔科技有限公司 热敏打印机控制方法、装置、热敏打印机和介质

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158476A (ja) * 1984-12-28 1986-07-18 Matsushita Electric Ind Co Ltd サ−マルヘツド駆動装置
JPS623970A (ja) * 1985-06-28 1987-01-09 Kyocera Corp 感熱記録装置
US4630068A (en) * 1985-09-30 1986-12-16 Raytheon Company High speed thermal printing circuit
JPS62244664A (ja) * 1986-04-17 1987-10-26 Matsushita Electric Ind Co Ltd 感熱転写型記録装置における記録ヘツド駆動装置
JPH082081B2 (ja) * 1987-08-28 1996-01-10 日本電気株式会社 印字制御回路

Also Published As

Publication number Publication date
EP0413413A2 (de) 1991-02-20
JPH0376659A (ja) 1991-04-02
DE69012714D1 (de) 1994-10-27
JP2753632B2 (ja) 1998-05-20
DE69012714T2 (de) 1995-02-02
EP0413413A3 (en) 1991-08-14
ATE111817T1 (de) 1994-10-15

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