EP0730972B1 - Commande thermique d'une tête d'impression - Google Patents

Commande thermique d'une tête d'impression Download PDF

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Publication number
EP0730972B1
EP0730972B1 EP96101152A EP96101152A EP0730972B1 EP 0730972 B1 EP0730972 B1 EP 0730972B1 EP 96101152 A EP96101152 A EP 96101152A EP 96101152 A EP96101152 A EP 96101152A EP 0730972 B1 EP0730972 B1 EP 0730972B1
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EP
European Patent Office
Prior art keywords
control
print head
control unit
voltage
input
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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
EP96101152A
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German (de)
English (en)
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EP0730972A3 (fr
EP0730972A2 (fr
Inventor
Stephan Günther
Dieter Wölm
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Francotyp Postalia GmbH
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Francotyp Postalia GmbH
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Publication date
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Publication of EP0730972A2 publication Critical patent/EP0730972A2/fr
Publication of EP0730972A3 publication Critical patent/EP0730972A3/fr
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Publication of EP0730972B1 publication Critical patent/EP0730972B1/fr
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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
    • B41J2/36—Print density control
    • B41J2/365—Print density control by compensation for variation in temperature
    • 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
    • B41J2/38—Preheating, i.e. heating to a temperature insufficient to cause printing

Definitions

  • the invention relates to a print head thermal control for a thermal printing device according to the im Preamble of claim 1 specified type.
  • the invention apply to a direct thermal, Thermal transfer or ETR printhead or inkjet printheads applied with associated pressure control will.
  • Such printing devices can for example in franking machines or other mail processing machines can be used advantageously.
  • DE 39 21 217 A1 already a calculation based on a Recording energy, a compensation energy and a heat storage energy that already before the Acts on the pressure element, presented.
  • the excitation time is then based on this calculation or voltage level of the pressure pulse reset.
  • Such a calculation in which the energy state must be taken into account before each printing process and new heat storage data for the subsequent one Energy state is generated and stored either only with additional complex hardware feasible or the printhead cannot be used for higher Print speeds are used.
  • EP 329 369 A2 describes a method for controlling the Feeding a thermal print head known, in which the print data of the previous and current ones Control processes are evaluated by the Thermal state of a printing element of the thermal print head to determine. After the analysis, the appropriate preheated pressure elements or corrective heating performed. Such subsequent analysis (so-called historical control) binds computing time. This is always disadvantageous if achieved a particularly high printing speed shall be. None of the aforementioned thermal print head controls becomes the influence of the ambient temperature or the print head parameter change, for example through aging, directly taken into account.
  • a thermal transfer printhead is known from EP 421 353 A1 can be operated in different print modes.
  • On the head is a thermometer attached to the head supplied pressure energy depending on the Head temperature and depending on the head strain To regulate (print mode).
  • the Pulse width reduced with increasing head temperature, without data processing (historical control) used for preheating pulses or for heating pulses must become. The process therefore works less precisely as a process with historical control, so that only a combination of both the required accuracy can be achieved. This again presents the disadvantage time-consuming data processing.
  • thermometer elements would be that they are still too sluggish on temperature changes respond (due to thermal storage of the head) and the other that attaching the Thermal pills on the head an additional effort means. Influences of the ambient temperature are only detected about the head temperature, although it is already even without triggering the printing process on the ribbon can reduce quality.
  • DE 41 33 207 A1 describes a method for controlling the supply of a thermal pressure heating element is known, where the print data for several future Pressure gaps to be taken into account Number of preheating pulses before printing selectively for each Determine pressure element.
  • the thermal print head control has no temperature measuring means.
  • DE 32 36 150 A1 was for a heat transfer printer already a control to control of the feed streams from the thermal head driver stage suggested according to the ambient temperature.
  • a thermistor is placed in the Supply voltage supply line to the printhead switched.
  • the thermistor has a temperature characteristic which corresponds to that of the ribbon. So change easily feed currents in a particular Relationship to the ambient temperature. By the Voltage drop across the thermistor in the Power supply line goes energy for printing lost. The efficiency is particularly for Higher resolution printheads, i.e. with many Pressure points (dots) worsened. Besides, it can a fluctuation of the depending on the printed image Printed image cannot be corrected.
  • the ribbon or the recording medium has a lot lower heat capacity than the printhead and consequently reacts faster to temperature fluctuations. It was found that a Temperature measurement on the printhead is advantageous Way can be omitted and that also in the Bypass temperature measurement, i.e. if the printhead not thermally coupled with the temperature sensor is a much faster response tent is guaranteed, in contrast to conventional on the Printhead used thermal sensors.
  • the object of the invention is to that the print head thermal control is a combination of power electronics assigned to a pressure control unit, which corresponds to the amplitude of the printhead voltage regulates the ambient temperature, and one Control unit based on a predictive control procedure for feeding individual pressure elements with Pressure pulses and with preheating pulses at variable Pulse duration works, has.
  • a predictive tax procedure will be beneficial future control parameters calculated so that also those to be expected from changes in temperature Influences remain relatively small. That leaves the Control deviation low and strong fluctuations in the Regulation is avoided, i.e. an overshoot occurs not on.
  • a potentiometer Through a storable presetting of parameters, can be a potentiometer through a software potentiometer named circuit to be replaced.
  • a software pot can be done by a service technician via actuators the keyboard 2 is set in service mode without opening the franking machine must become.
  • a corresponding print head thermal control variant is intended for a printhead that has a variety of printing elements and with power electronics and with a pressure control unit and with a control unit is connected, the control unit with the input means and with the output means via an I / O controller and coupled with storage means is.
  • the power electronics regulate the amplitude the printhead voltage proportional to the measured temperature and is assigned to the pressure control unit.
  • a variety of printing elements are used by the microprocessor the control unit according to a predictive control procedure controlled. They are electronic means Preset the amplitude of the printhead voltage and for the delivery of control parameters intended.
  • the preset voltage can by means of actuating means of the input means in service mode according to the customer specific required printhead parameters set and the setting in one of the storage means is non-volatile get saved.
  • FIG. 1 shows a block diagram of a franking machine with the print head thermal control according to the invention.
  • a printing device for the franking machine For example, a direct thermal, thermal transfer ETR or inkjet print head 1 with associated Pressure control unit (DS) 14 can be used.
  • This Pressure control unit 14 is used to control printing elements for digital printing.
  • the print control unit 14 is available with the print head 1 Data transfer via lines DÜ and also via a power electronics LE for power takeover by means of lines LÜ in connection. The simplicity only one line was shown for the sake of it.
  • the arrangement also consists of a Input / output means 2, 3, 4 and volatile Storage means 7 and with non-volatile storage means 5, 8, 9, 10, 11 connected control unit 6, the after a predictive tax procedure works which without direct temperature measurement the print head 1 needs.
  • the control unit 6 is also with an encoder 13 as a displacement sensor and with a transport device 12 for the mail or with a strip dispenser including strip release 12 connected. The individual print columns are according to the transport speed of the mail printed until the franking stamp image is complete.
  • the program memory 11 are in addition to the operating program the pixel image data for the immutable parts of the image saved.
  • the character memory 9 are the variable Pixel image data, which according to the input via a Keyboard 2 in a non-volatile memory be saved.
  • the clock / date block 8 provides further input data for the postmark, for which are generated in the same way pixel image data.
  • the volatile storage means 7 becomes the finished pixel image stored and by the microprocessor of the control unit 6 evaluated with foresight.
  • the volatile storage medium 7 is, for example, a RAM chip or a internal RAM of the micro-processor in the control unit 6.
  • the control unit 6 reads from the connected Pixel memory 7 from the pixel image data and edited this data to the print control unit 14 Print image data according to the predictive Tax proceedings.
  • the corresponding is Operating program stored in the program memory 11.
  • the thermistor which is only the ambient temperature can therefore be a cheap design instead of expensive thermistor pill are used because the No longer arranged on the printhead.
  • the Thermistor is no longer placed directly on the printhead must be, on the one hand results from the use of the the aforementioned predictive tax procedure.
  • the invention has succeeded in thermal memory elements of the measuring arrangement with the To reduce the temperature sensor so that a sufficient Fast readjustment when the bypass temperature changes done without overshoot.
  • both the type of tape used or for direct thermal printing the type of paper used as a further influencing factor be considered more easily.
  • the power electronics one Temperature sensor R9 containing voltage divider R8, R9 for measuring the ambient temperature, its tap with the non-inverting input a proportional controller N9 is connected and that the inverting input of the proportional controller N9 with a reference voltage source is connected, and that the proportional controller N9 with the control input at least a constant voltage module N1, N2, N3 connected is.
  • the temperature sensor R9 is a thermistor and the voltage divider R8, R9 with a second constant voltage module N4 a second constant voltage is fed.
  • the control input of the at least one constant voltage module N1, N2, N3 is with an adjusting means R connected.
  • the pressure pulse voltage level becomes at a defined temperature to a voltage, for example +16 V in the thermal transfer printing process, by means of an adjusting means R.
  • Current distribution resistors R1, R2, R3 are for example three constant voltage modules N1, N2, N3 connected on the output side.
  • an adjusting resistor is the output the proportional controller N 9 via an RC element R7, C3 which, with its inverting input the tap of the (containing the thermistor R9) Voltage divider R8, R9 is connected.
  • the second Constant voltage module N4 provides the required +5 V supply voltage for the electronics.
  • the other non-inverting input of controller N9 is on Tap another voltage divider R5, R6 Reference potential.
  • the superimposed rapid thermal control by the Microprocessor is of different system parameters (such as print speed, print mode).
  • the microprocessor can, with this information fed, any control curves and any control behavior realize.
  • Setting means R on from the microprocessor of the control unit 6 driven D / A converter is or that Setting means a switchable by the microprocessor Resistor arrangement contains.
  • the belt speed or the printing speed taken into account or a basic contrast for the print image can be set.
  • the necessary Data D for setting the basic contrast are in Memory area H of the main memory 5 is non-volatile saved and can be entered via keyboard 2 will.
  • FIG. 1 Another circuit variant is shown in FIG shown with an electronic preset the voltage value by means of a digital / analog converter (DAU) is realizable.
  • DAU digital / analog converter
  • Such Circuit variant is also used as a software potentiometer designated.
  • the franking machine is in a service mode switchable.
  • a button for one Up function and a button for a down function can the preset voltage value increases or decreases will.
  • the digital / analog converter (DAU) exists for example from a controllable by the microprocessor HC-Latch 20 and an R2R resistor network R51 to R58 and R61 to R 67.
  • the DAC output currents are from the aforementioned R2R resistor network, which with a resistor R6 connected to ground potential forms a voltage divider into a preset voltage implemented, which at the non-inverting input of a controller N9 is present.
  • This voltage can, for example, with a Step size of 0.01 V implemented by an 8-bit DAC will.
  • the aforementioned controller N9 is a subtracting amplifier switched. At its inverting input is the output voltage of a temperature sensor amplifier N8 on. At the output of controller N9 is over an RC element R7C3 the non-inverting input (+) a non-inverting adjustment amplifier N10, V3, R13 and R14 on. The output of the aforementioned amplifier is connected to a resistor R15 Control input of the at least one constant voltage module N1, N2, N3.
  • an NTC termistor as a temperature sensor serves with negative temperature coefficients, which with a series resistor R8 and a ground connection delivering base resistor R18 a voltage divider forms, with the terminator R9 of the voltage divider a second constant voltage module N4 with a second constant voltage U4 is fed.
  • the voltage divider tap is at the non-inverting input of the temperature sensor amplifier N8 and is with one connected in parallel to the base resistor R18 Capacitor C9 stabilized. With increasing temperature the voltage divider provides one at its tap increasing voltage at the non-inverting input of the temperature sensor amplifier N8, its output voltage increases.
  • the second constant voltage module N4 provides one second voltage U2, for example the required +5 V supply voltage for the printhead electronics.
  • Such printhead electronics of the printhead 1 contains at least that Driver gate to act upon the individual Print elements of the print head 1 on the one hand with data via data transfer lines DÜ from the print control unit DS and on the other hand with energy, for example first and second voltages U1 and U2, via power take-over lines LÜ from the LE power electronics.
  • a different temperature sensor can be used Circuit selected for the temperature sensor amplifier to increase the tension before it is directed to the controller.
  • the controller adds a negative Voltage to preset voltage or subtracted a positive voltage depending on the preset voltage according to the selected circuit type.
  • the presetting voltage is dependent on a parameter, for example the resistance value of a thermal transfer printhead, the control voltage to at least one Constant voltage module N1, N2, N3 set.
  • the power electronics shown in FIG. 4 LE can also with a switch and one from the microprocessor of the control unit 6 queryable comparator can be expanded. Not that one Switch means shown is provided to the Switch off or bypass the temperature sensor. This is advantageous for comparing the DAU.
  • the compressive voltage U1 is then with a comparator, not shown an exact reference voltage and thus a Offset determined for the DAU. This comparison is at of manufacture and can be delivered to the customer be repeated to compensate for a drift.

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Claims (11)

  1. Commande thermique de tête d'impression pour une tête d'impression thermique qui présente une grand nombre d'éléments d'impression et qui est reliée avec une électronique de puissance et une unité de commande d'impression (14) et avec une unité de commande (6), l'unité de commande (6) étant couplée avec le moyen d'entrée et le moyen de sortie par une commande E/S (4) et un moyen de mémorisation, caractérisée en ce que l'électronique de puissance affectée à l'unité de commande d'impression (14) règle l'amplitude de la tension de la tête d'impression en fonction de la température ambiante et est combinée avec l'unité de commande (6) qui fonctionne selon un procédé de commande prévoyant destiné à l'alimentation des différents éléments chauffants d'impression thermique avec des impulsions de préchauffage et d'impression d'une durée d'impulsion variable.
  2. Commande thermique de tête d'impression, selon la revendication 1, caractérisée en ce que l'électronique de puissance présente un diviseur de tension (R8, R9) comprenant le capteur de température (R9) pour la mesure de la température ambiante dont la prise est reliée à l'entrée non invertissante d'un régulateur à action proportionnelle, et en ce que l'entrée invertissante du régulateur à action proportionnelle (N9) est relié à un potentiel de référence, et en ce que le régulateur à action proportionnelle (N9) est relié à l'entrée de commande d'au moins un module de tension constante (N1, N2, N3).
  3. Commande thermique de tête d'impression, selon les revendications 1 et 2, caractérisée en ce que le capteur de température (R9) est un thermistor et le diviseur de tension (R8, R9) est alimenté avec une deuxième tension constante à partir d'un deuxième module de tension constante (N4).
  4. Commande thermique de tête d'impression, selon les revendications 1 à 3, caractérisée en ce que l'entrée de commande d'au moins un module de tension constante (N1, N2, N3) est reliée à un moyen de réglage (R).
  5. Commande thermique de tête d'impression, selon les revendications 1 à 4, caractérisée en ce que le régulateur à action proportionnelle (N9) est relié à l'entrée de commande d'au moins un module de tension constante (N1, N2, N3) via un circuit RC (R7, C3) et via ledit moyen de réglage (R).
  6. Commande thermique de tête d'impression, selon les revendications 1 à 4, caractérisée en ce que le moyen de réglage (R) est un convertisseur analogique/numérique piloté par le microprocesseur de l'unité de commande (6), et en ce que le moyen de réglage (R) contient un agencement de résistances (Rs, Ra, Rb, Rc, Sb, Sc) commutable côté du microprocesseur.
  7. Commande thermique de tête d'impression, selon les revendications 1 à 5, caractérisée en ce que le moyen de réglage (R) est un convertisseur analogique/numérique piloté par le microprocesseur de l'unité de commande (6), et en ce que le moyen de réglage (R) contient un agencement de résistances (Rs, Ra, Rb, Rc, Sb, Sc) commutable côté du microprocesseur.
  8. Commande thermique de tête d'impression pour une tête d'impression thermique qui présente une grand nombre d'éléments d'impression et qui est relié avec une électronique de puissance et une unité de commande d'impression (14) et avec une unité de commande (6), l'unité de commande (6) étant couplée avec le moyen d'entrée et le moyen de sortie par une commande E/S (4) et un moyen de mémorisation, caractérisée en ce que
    l'électronique de puissance (LE) règle l'amplitude de la tension de la tête d'impression proportionnellement à la température mesurée et qu'elle est affectée à l'unité de commande d'impression (14), un grand nombre d'éléments d'impression étant piloté par le microprocesseur de l'unité de commande (6) selon un procédé de commande prévoyant, et en ce que
    il est prévu des moyens pour le préréglage électronique de l'amplitude de la tension de la tête d'impression et pour la fourniture de paramètres de commande, les moyens destinés au préréglage électronique incluant des moyens de mémorisation (5, 8, 10), le microprocesseur de l'unité de commande (6), une commande E/S et des moyens d'actionnement du moyen d'entrée raccordé et une électronique de puissance (LE) reliée au microprocesseur de l'unité de commande (6) via l'unité de commande d'impression (14) et présentant un convertisseur numérique/analogique (DAU) et un circuit de réglage, la tension de préréglage pouvant être réglé à l'aide du moyen d'actionnement du moyen d'entrée (3), dans le mode service, conformément aux paramètres de la tête d'impression spécifiquement nécessaires au client, et le réglage pouvant être mémorisé, d'une manière non volatile, dans un des moyens de mémorisation (5, 8, 10).
  9. Commande thermique de tête d'impression, selon la revendication 8, caractérisée en ce que l'électronique de puissance présente un diviseur de tension (R8, R9, R18) contenant le capteur de température (R9) pour la mesure de température, dont la prise est reliée à l'entrée non invertissante d'un amplificateur de mesure de température (N8), en ce que l'entrée invertissante d'un régulateur à action proportionnelle (N9) est reliée à la sortie de l'amplificateur de mesure de température (N8) via une résistance (R11), et en ce que l'entrée non invertissante d'un régulateur à action proportionnelle (N9) est reliée à une tension de préréglage qui est mise à disposition par le convertisseur numérique/analogique (DAU), et en ce que le régulateur à action proportionnelle (N9) est relié à l'entrée de commande d'au moins un module de tension constante (N1, N2, N3) via un amplificateur de réglage ( N10, V3, R13, R14) non invertissant et va une résistance (R15).
  10. Commande thermique de tête d'impression, selon les revendications 8 et 9, caractérisée en ce que le capteur de température (R9) est un thermistor et le diviseur de tension (R8, R9) est alimenté avec une deuxième tension constante (U2) à partir d'un deuxième module de tension constante (N4).
  11. Commande thermique de tête d'impression, selon les revendications 8 à 10, caractérisée en ce que le régulateur à action proportionnelle (N9) est relié à l'amplificateur de réglage (N10, V3, R13, R14) non invertissant via un circuit RC (R7, C3).
EP96101152A 1995-03-07 1996-01-27 Commande thermique d'une tête d'impression Expired - Lifetime EP0730972B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29504576U 1995-03-07
DE29504576U DE29504576U1 (de) 1995-03-07 1995-03-07 Druckkopfthermosteuerung

Publications (3)

Publication Number Publication Date
EP0730972A2 EP0730972A2 (fr) 1996-09-11
EP0730972A3 EP0730972A3 (fr) 1996-12-27
EP0730972B1 true EP0730972B1 (fr) 1998-08-05

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EP96101152A Expired - Lifetime EP0730972B1 (fr) 1995-03-07 1996-01-27 Commande thermique d'une tête d'impression

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US (1) US5838356A (fr)
EP (1) EP0730972B1 (fr)
DE (2) DE29504576U1 (fr)

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DE102004027517B4 (de) * 2004-06-03 2007-05-10 Francotyp-Postalia Gmbh Anordnung und Verfahren zur Ansteuerung eines Thermotransferdruckkopfes

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US5838356A (en) 1998-11-17
EP0730972A3 (fr) 1996-12-27
DE29504576U1 (de) 1995-05-11
EP0730972A2 (fr) 1996-09-11
DE59600393D1 (de) 1998-09-10

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