EP0645249A2 - Circuit de commande pour tête d'impression thermique - Google Patents

Circuit de commande pour tête d'impression thermique Download PDF

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Publication number
EP0645249A2
EP0645249A2 EP94113778A EP94113778A EP0645249A2 EP 0645249 A2 EP0645249 A2 EP 0645249A2 EP 94113778 A EP94113778 A EP 94113778A EP 94113778 A EP94113778 A EP 94113778A EP 0645249 A2 EP0645249 A2 EP 0645249A2
Authority
EP
European Patent Office
Prior art keywords
microprocessor
data
buffer
control circuit
print head
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
EP94113778A
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German (de)
English (en)
Other versions
EP0645249A3 (fr
EP0645249B1 (fr
Inventor
Gamal Hagar
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.)
Meto International GmbH
Original Assignee
Esselte Meto International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Esselte Meto International GmbH filed Critical Esselte Meto International GmbH
Publication of EP0645249A2 publication Critical patent/EP0645249A2/fr
Publication of EP0645249A3 publication Critical patent/EP0645249A3/fr
Application granted granted Critical
Publication of EP0645249B1 publication Critical patent/EP0645249B1/fr
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
    • B41J2/3555—Historical control
    • 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 invention relates to a control circuit for a thermal printing machine with a thermal print head with a series of electrically controllable heating elements, with a microprocessor, which transfers data to be printed out to a register assigned to the thermal print head, which drives driver circuits connected to the heating elements, the register serializing the data Receives form.
  • thermal printing heads which have a number of individually electrically controllable heating elements.
  • the supply of the data to be printed to the thermal print heads takes place in the prior art, as has become known for example from DE 36 13 946 A1 or EP 501 707 A2, by means of a serial data line.
  • the data is thus transferred from one microprocessor arranged on the main circuit board to the print head by means of only one line, where it is parallelized by means of a (shift) register - in each case corresponding to one print line and serve to control the driver circuits of the heating elements.
  • a disadvantage of this is the high time required for serial data transmission: since today's thermal print heads usually have more than 1000 heating elements and as many register elements, it causes a not inconsiderable time delay to bring the data into serial form using the microprocessor and to transmit it sequentially. Because the microprocessor is not available for other tasks (such as arithmetic operations or the control of the counterpressure roller) during this time, it has to be done afterwards, so that the maximum printing speed is not significantly reduced as a result.
  • the stepping motor driving the counterpressure roller is controlled - as is known, for example, from JP 60-83864 A - in such a way that a control circuit emits a number of pulses corresponding to the respective advance of the recording medium to a stepping motor.
  • the same microprocessor generally controls both the data transmission to the printhead and the stepper motor of the counterpressure roller, software routines are conventionally used which result in the corresponding pulses being sent to the stepper motor, but the microprocessor while the recording medium is being advanced block for other tasks.
  • the object of the present invention is to improve the known control circuits in such a way that the efficiency of the microprocessor is improved and the realizable printing speed is increased.
  • the object is achieved by a buffer connected to the microprocessor by means of a parallel data line, and a separate state-of-charge control circuit which is connected to the buffer, and when a defined amount of data written by the microprocessor is written into the buffer, a transfer of data from the buffer to the register prompted.
  • the main idea is to relieve the microprocessor by means of an external memory and a state-of-charge control circuit.
  • the data is read in parallel from the microprocessor into the buffer memory at high speed and then sequentially transferred in a conventional manner into the register of the thermal print head, the sequential transfer of the data into the register being controlled not by the microprocessor but by the separate state-of-charge control circuit.
  • the latter monitors the fill level, ie the proportion of the memory written with data to be printed, and activates the transfer to the register of the print head as soon as a predetermined value is exceeded.
  • the capacity of the buffer memory usually corresponds to that of the register of the thermal print head. It is crucial that the microprocessor after the data has been transferred to the buffer for any other tasks - such as controlling the printer mechanics or calculating the data to be printed out (bitmap) - as it is no longer responsible for sequencing the data or controlling the transfer.
  • the invention enables a substantial acceleration of the printing process due to the relief of the microprocessor by the state of charge control circuit.
  • Such a control makes it possible, on the one hand, to select the capacity of the buffer memory less than that of the register of the thermal print head, and to successively transfer the data of a print line in partial quantities from the microprocessor to the register via the buffer memory, but, on the other hand, which is preferred during the transfer to write data from the microprocessor into the buffer at the same time the register.
  • the advantageous consequence is the time saved by the simultaneous running Data transfers that allow the printing speed to be increased.
  • a buffer known primarily as a first-in-first-out can be used as a buffer, since it enables the data that was written first to be transferred to the register first while maintaining the correct sequence.
  • a parallel-serial converter is connected to the intermediate memory via a data bus in such a way that in each case one data word from the same (first) memory area can be read out.
  • the microprocessor writes the data of the first data word to be output (which for example comprises 16 bits) into this memory area.
  • a pulse that is initially reset is incremented by a pulse applied to the write output of the microprocessor.
  • the subsequent data words are written into the subsequent memory areas using the counter pointer, the counter pointer incrementing by one each time a data word (for example 16 bits) has been written becomes.
  • the buffer is thus filled successively.
  • the state of charge control circuit Based on the counter pointer, the state of charge control circuit recognizes the level of the memory and activates the transfer of data to the parallel-serial converter when the defined quantity is reached.
  • the data of the first memory area are read out in each case.
  • the counter pointer is decremented and the data in the subsequent memories are copied word by word to the previous memory.
  • the buffer is thus managed dynamically in the manner of a queue (queue, first-in-first-out).
  • Modern thermal print heads as described for example in EP 501 707 A2, have an input for a print release signal with which the heating elements can be activated. Since the latter have a greatly shortened service life in continuous operation, it proves necessary to chop the pressure release signal, that is to say to put it together from individual pulses.
  • a pressure release signal which consists of an initial continuous pulse with subsequent rectangular pulses, is advantageous and therefore common. The duration of the pulses and the gaps defines the heating energy and thus the temperature of the heating elements.
  • the microprocessor In order to relieve the microprocessor of the generation of the pressure release signal, which is carried out in the prior art by software routines and has a corresponding time requirement, it is proposed here to provide the corresponding output of the microprocessor and / or the state-of-charge control circuit with a circuit which provides the desired pulses generated.
  • the microprocessor therefore only needs to emit a pulse to activate the circuit and is immediately available for other tasks, while the latter generates the pressure release signal.
  • the microprocessor transmits corresponding data on the duration of the pulses and spaces before the output of a printed page on the circuit. On the one hand, this enables a sufficiently frequent adjustment to the current printing parameters, on the other hand, the time required for the update is limited.
  • the pressure release signal can be activated by the microprocessor and / or by the state of charge control circuit. It should be noted that in addition to the print release signal, the print head generally also takes into account the previous print data and the data of the adjacent heating elements (the so-called dot history) when calculating the energy supplied to the heating elements.
  • thermal printhead with a temperature sensor and to connect the latter to an input of the microprocessor, so that the latter can control the circuit for generating the print release signal by means of a variation in the duration of the pulses and / or their gaps based on the temperature of the printhead. that on the one hand the maximum permissible temperature of the print head is not exceeded, on the other hand optimal printing results are obtained.
  • the print release signal can be varied by the microprocessor in such a way that the temperature of the heating elements is optimally adapted to the printing speed and / or the type of paper being printed.
  • the problem underlying the invention in a control circuit for a printing press with a print head can be achieved with a microprocessor which has an output which is connected to the stepping motor solve, in that a pulse generator and a stepper motor driver is connected between the output of the microprocessor and the stepper motor.
  • the basic idea is not to generate the control pulses of the stepper motor by appropriate programming of the microprocessor, as is customary in the prior art, but to produce them by hardware using a separate pulse generator. Its output signals are amplified in a stepper motor driver and finally fed to the stepper motor.
  • Multi-color printing can be implemented particularly easily if the microprocessor controls at least one further thermal print head and also drives, via at least one further pulse generator and at least one further stepper motor driver and stepper motor, a further counterpressure roller, on each of which a thermal print head rests. Since counter pressure rollers usually have slightly different diameters, it is necessary to that they are operated at different speeds. While problems are to be expected with a conventional, software-based control if the pulses of two stepper motors have to coincide, but due to the sequential programming are separated in time, such a control can be implemented without any problems since each stepper motor is driven by its own pulse generator.
  • the control circuit for a thermal print head (1) shown in FIG. 1 has a microprocessor (2) to which an operating keyboard (3) is connected as a data input option.
  • the microprocessor (2) has a data input interface (4), a read / write controller (5), a first pulse generator (6), connected to a circuit (7) for generating a pressure release signal and to a temperature sensor (8) for detecting the temperature of the thermal print head (1).
  • the microprocessor (2) controls a second pulse generator (9) which is connected via a stepper motor driver (10) to a stepper motor (11) for driving the counter pressure roller (12).
  • a register (13) is indicated in the thermal print head (1), which has as many memory cells as the thermal print head (1) has heating elements (14).
  • the present embodiment can be equipped, for example, with a thermal print head (1) with 1280 heating (14) and register elements (13).
  • the core of the control circuit is formed by a buffer (15), which e.g. consists of 80 16-bit memory elements.
  • the data to be printed are read into the register (13) of the thermal print head via a parallel-serial converter (16) connected to the buffer (15).
  • the clock pulses of the pulse generator (6) are fed directly to the thermal print head (1).
  • the memory content of the intermediate store (15) is monitored by a state of charge control circuit (17).
  • the control unit (3) causes the microprocessor (2) to read data into the buffer (15) via the data input interface (4)
  • the charge state control circuit (17) monitors how much memory space the buffer (15) is occupied. Even if a certain proportion of 30%, for example, has been written, the read / write control (5) is triggered by the state of charge control circuit (17), Read data into the parallel-serial converter (16) and write them clocked by the first pulse generator (6) into the register (13). In parallel with this, further data are read into the buffer (15) in a controlled manner by the read / write controller (5).
  • the circuit (7) is caused by the microprocessor (2) to send a print release signal to the thermal printhead (1) so that the stored data is written on a recording medium (18) become.
  • the second pulse generator (9) is started by the microprocessor (2), which now automatically controls the stepper motor (11) via the stepper motor driver (10), which drives the counterpressure roller (12) for transporting the record carrier (18).
  • a multi-color thermal printer is schematically sketched, which in addition to the microprocessor (2), the second pulse generator (9), the stepper motor driver (10), the stepper motor (11), the counter-pressure roller (12) and the thermal print head (1) has a further pulse generator (19), a further stepper motor driver (20), a further stepper motor (21), a further counter pressure roller (22) and a further thermal print head (23).
  • the temperature-sensitive recording medium (18) reacts to different temperatures with different colors. Multi-color printing can thus be achieved in that the heating elements (14) of the two thermal print heads (1, 23) are heated to different temperatures and then print on the recording medium (18) one after the other.
  • the circuit (7) for generating the print release signal is shown. It is controlled by the microprocessor (2) and consists of a first (24), a second (25) and a third rectangular pulse generator (26).
  • the output of the first rectangular pulse generator (24) is connected to the non-inverting inputs of a first (27) and the second AND gate (28), while the output of the second rectangular pulse generator (25) is connected to the non-inverting input of the first AND gate (27) and a second AND gate (28) is connected.
  • the outputs of the first AND gate (27) and the third rectangular pulse generator (26) are connected to the inputs of an OR gate (29) which supplies the pressure release signal via its output.
  • the pulse diagram sketched in FIG. 4 shows the function of the circuit (7).
  • the microprocessor (2) delivers a start signal (a) to the first (24) and to the second rectangular pulse generator (25), which causes the first rectangular pulse generator (24) to emit a pulse (b) and the second rectangular pulse generator (25) stimulates to generate a pulse (c).
  • Both pulses (b) and (c) are supplied to the first AND gate (27), at the output of which the pulse (c) is thus applied.
  • both pulses (b and c) are fed to the second AND gate (28), which uses this to generate the signal (b AND NOT c) and delivers it to the third rectangular pulse generator (26).
  • the third Rectangular pulse generator (26) is driven by this signal (b AND NOT c), it generates the signals (d) which, together with the signal (c) after an OR operation in the OR gate (29), give the pressure release signal (e) .
  • the microprocessor is controlled via the line (30) by the temperature sensor (8) located in the thermal print head. This causes the microprocessor (2) to vary the duration of the pulse (c) in the second rectangular pulse generator (25) and the duty cycle of the third signal generated by the rectangular pulse generator (d) such that the temperature of the thermal print head (1) has an optimal, uncritical value assumes.
  • FIG. 5 shows the internal structure of a state-of-charge control circuit (17) and its connection to the rest of the control circuit.
  • the data bus (D) of the microprocessor (2) is connected directly to the buffer (15) in this drawing.
  • the write output (WR) of the microprocessor which is only set to one during data output, is connected both to the buffer store (15) and to a counter pointer (31) of the charge status control circuit (17).
  • the output (A) of the counter pointer (31) is raised (incremented) by one, which is why its corresponding input is labeled INC in the figure.
  • the data words of the microprocessor (2) are entered in the memory area of the intermediate memory (15) shown below.
  • the output (A) of the counter pointer (31) has been incremented, the subsequent data are transferred to the address corresponding to its output (A) and following the lowest memory cell of the buffer (15) entered, the latter thus filled successively from bottom to top.
  • the data transfer from the buffer (15) into the parallel-serial converter (16) and into the register (13) of the thermal print head (1) is controlled by the actual hardware controller (32).
  • the output (A) of the counter pointer (31) reaches a specified number (which corresponds to the defined amount of data at which the reading process into the print head (1) should start)
  • a pulse at the output (cpy) of the hardware control (32) which represents a copy command and causes, on the one hand, the data word (D ') of the lowest memory cell of the buffer (15) to the parallel-serial converter (16) and from there in serial form (D' ') to the register (13 ) is transmitted, on the other hand the data words of all other memory cells of the buffer (15) are shifted down by one memory cell - therefore the output (cpy) is connected to the buffer (15) and the parallel-serial converter (16).
  • the buffer (15) is thus successively read out into the register (13).
  • a pulse is applied to the input (DEC) of the counter pointer (31) for each data word that is read out, which decrements its output (A) by one. If the microprocessor (2) now writes, since the memory cell has become free, the next lower one is now filled.
  • the hardware control (32) also activates a timer (33), at the output (clk) of which rectangular pulses are present during data readout, which serve as a clock for the parallel-serial converter (16) and the register (13).
  • a synchronization of the hardware control (32) is required to prevent a Incrementing and a decrementing signal are present at the counter pointer (31) - if the microprocessor (2) and the buffer (15) simultaneously outputs data - and data are entered into an incorrect address of the buffer (15).
  • the synchronization can take place in such a way that the hardware control (32) prevents the decrement command (DEC) as long as the write output (WR) of the microprocessor (2) is at one.
  • the decrement command (DEC) (and the copying process, in which the data words of all memory cells of the intermediate memory (15) are each shifted down by one memory cell) is made up after the writing process of the microprocessor (2) has ended, so that the output (A) of the Counter pointer (31) is updated before the next write operation. It is therefore possible to read and read data into the buffer (15) at the same time, since both processes take place at different addresses.
  • the result is a control circuit for a printing press, which is characterized by high efficiency and printing speed.

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EP94113778A 1993-09-24 1994-09-02 Circuit de commande pour tête d'impression thermique Expired - Lifetime EP0645249B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4332572A DE4332572A1 (de) 1993-09-24 1993-09-24 Steuerschaltung für mindestens einen Thermodruckkopf
DE4332572 1993-09-24

Publications (3)

Publication Number Publication Date
EP0645249A2 true EP0645249A2 (fr) 1995-03-29
EP0645249A3 EP0645249A3 (fr) 1997-10-22
EP0645249B1 EP0645249B1 (fr) 2001-11-28

Family

ID=6498544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113778A Expired - Lifetime EP0645249B1 (fr) 1993-09-24 1994-09-02 Circuit de commande pour tête d'impression thermique

Country Status (8)

Country Link
US (1) US5559547A (fr)
EP (1) EP0645249B1 (fr)
JP (1) JPH07205467A (fr)
AU (1) AU673284B2 (fr)
DE (2) DE4332572A1 (fr)
DK (1) DK0645249T3 (fr)
ES (1) ES2169056T3 (fr)
SG (1) SG74555A1 (fr)

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JPH08276572A (ja) * 1995-04-07 1996-10-22 Sharp Corp インクジェットプリンター、及び、インクジェットプリンターの調整方法
US6106172A (en) * 1998-02-24 2000-08-22 Eastman Kodak Company Method and printer utilizing a single microprocessor to modulate a printhead and implement printing functions
US6476928B1 (en) * 1999-02-19 2002-11-05 Hewlett-Packard Co. System and method for controlling internal operations of a processor of an inkjet printhead
WO2001046869A2 (fr) 1999-12-10 2001-06-28 United Video Properties, Inc. Systemes et procedes permettant de coordonner les opportunites de publicite et de marchandisage interactives et passives
US6404452B1 (en) 2000-08-03 2002-06-11 Axiohm Transaction Solutions, Inc. Auxiliary control device for managing printing in a thermal printer
US6788325B2 (en) 2002-02-06 2004-09-07 Brady Worldwide, Inc. Processing multiple thermal elements with a fast algorithm using dot history
US6570602B1 (en) 2002-02-06 2003-05-27 Brady Worldwide, Inc. Generating and storing supply specific printing parameters
US6991130B2 (en) * 2002-09-13 2006-01-31 Avery Dennison Corporation Versatile label sheet and dispenser
US7128236B2 (en) * 2002-09-13 2006-10-31 Avery Dennison Corporation Versatile label sheet and dispenser
FR2915130B1 (fr) * 2007-04-19 2010-08-20 A P S Engineering Moyens de commande, element electronique et carte de controle pour fonctionnement d'un mecanisme d'impression thermique.
US9416652B2 (en) 2013-08-08 2016-08-16 Vetco Gray Inc. Sensing magnetized portions of a wellhead system to monitor fatigue loading
US9288521B2 (en) 2014-05-28 2016-03-15 Rovi Guides, Inc. Systems and methods for updating media asset data based on pause point in the media asset
KR102035784B1 (ko) * 2018-01-29 2019-10-24 주식회사 디원씨앤아이 인쇄속도 증가를 위한 방법 및 인쇄장치
CN111923606B (zh) * 2020-06-30 2022-03-29 厦门汉印电子技术有限公司 一种打印机
CN119037038B (zh) * 2024-09-03 2025-09-23 北京博源恒芯科技股份有限公司 一种喷墨打印方法、装置及设备

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Also Published As

Publication number Publication date
US5559547A (en) 1996-09-24
SG74555A1 (en) 2000-08-22
JPH07205467A (ja) 1995-08-08
DE59409974D1 (de) 2002-01-10
EP0645249A3 (fr) 1997-10-22
ES2169056T3 (es) 2002-07-01
DE4332572A1 (de) 1995-03-30
AU7299594A (en) 1995-04-06
EP0645249B1 (fr) 2001-11-28
DK0645249T3 (da) 2002-03-11
AU673284B2 (en) 1996-10-31

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