EP0082799B1 - Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart - Google Patents

Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart Download PDF

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Publication number
EP0082799B1
EP0082799B1 EP82730126A EP82730126A EP0082799B1 EP 0082799 B1 EP0082799 B1 EP 0082799B1 EP 82730126 A EP82730126 A EP 82730126A EP 82730126 A EP82730126 A EP 82730126A EP 0082799 B1 EP0082799 B1 EP 0082799B1
Authority
EP
European Patent Office
Prior art keywords
current
base
circuit arrangement
transistor
emitter
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
Application number
EP82730126A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0082799A2 (de
EP0082799A3 (en
Inventor
Manfred Ing. Grüner (grad.)
Bernd Dipl.-Ing. Gugel
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT82730126T priority Critical patent/ATE31124T1/de
Publication of EP0082799A2 publication Critical patent/EP0082799A2/de
Publication of EP0082799A3 publication Critical patent/EP0082799A3/de
Application granted granted Critical
Publication of EP0082799B1 publication Critical patent/EP0082799B1/de
Expired 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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/44—Control for hammer-impression mechanisms
    • 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
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/30—Control circuits for actuators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1883—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings by steepening leading and trailing edges of magnetisation pulse, e.g. printer drivers

Definitions

  • the invention relates to a driver circuit for printers, in particular for matrix printers of the needle or hammer type with a character generator generating pressure signals and start signals, wherein a pressure signal and a start signal at the signal input are linked by AND gates, and also each connected to the AND gates , monostable multivibrators, each having a timing element and the outputs of which are connected separately to the base of control transistors via control gates, the emitters of which are connected to the base of transistors via base resistors, the collector or their emitters being switchable at voltage levels and wherein the magnetic coil for the needle to be fired or for the hammer is provided on one of the transistors.
  • Driver circuits of this type are used in matrix printers in order to supply an electrical current pulse in a time-controlled manner to the pressure needles or pressure hammers provided with electromagnetic coils. Because of the current pulse, the printing needles or the printing hammers are fired and produce a dot print on the recording medium opposite them (e.g. a paper strip) via the ink ribbon, a large number of dot prints forming a character. After the printing needles or print hammers have been fired, the recording medium is advanced in the direction of its longitudinal extent, so that either a new line (line printer) or a new series of dots (serial printer) can be written.
  • the recording medium is advanced in the direction of its longitudinal extent, so that either a new line (line printer) or a new series of dots (serial printer) can be written.
  • a control circuit for print hammers has become known which, unlike the one described here, has no different voltage levels.
  • a pulse waveform determined in terms of size and duration is generated with a character pulse generator.
  • Toggle stages are connected upstream of the control circuit part for each of the electromagnetic coils.
  • the collector-emitter resistance of the transistors feeding the magnetic coils is influenced in a current-dependent manner by several transistor stages.
  • the invention has for its object to provide an advantageous circuit that counteracts excessive heating of the printhead or hammer bank. This should also apply to higher frequency ranges (such as the range of the cut-off frequency) in order to increase the service life of the elements exposed to heating and to save forced cooling.
  • the lower current spike causes less heating of the components and enables the cutoff frequency of the mechanical system of the printing needles or the printing hammers to be reached during the printing work. Forced cooling of the print head or hammer bank can be dispensed with. After reaching the point in time at which one of two voltage levels is sufficient to maintain the current through the magnetic coil, one of the voltage levels is switched off.
  • a residual current remaining in the magnetic coil from a previous pressure pulse can be detected by the current limiting circuit. This measure means that the current in the magnetic coil does not exceed the predetermined value due to the current limitation, even if there is still a residual current from the previous switch-on, which would make the current increase faster.
  • the current limiting circuit with the exception of the magnetic coil, and the components of the voltage stage circuit are arranged on a printed circuit board which is arranged at a distance from the wire print head or at a distance from the hammer bank of the matrix printer.
  • a heating due to the current heat in the reference resistor can thus be easily dissipated via the intended cooling of the housing of the printer, without affecting the sensitive components of the needle printhead or the hammer bank.
  • the pressure pulse 1a for a needle or a hammer is fed via line 1 in the AND gate circuit, consisting of gates G1 and G2, to input 13 of gate G1, line 1 via line 2 with input 9 of the gate G2 is connected.
  • the start signal 3a is input via line 4 to input 10 of gate G2, the link being made via line 5 to input 12 of gate G1.
  • the two gates G1 and G2 each start the signals at the same time.
  • the pressure pulse 1a and the start signal 3a are supplied to the monostable multivibrators T1 and T2, for which purpose the gate G1 is connected at the output 11 to the input 14 of the multivibrator T1 and the gate G2 is located at the output 8 with the input 15 of the multivibrator T2.
  • the timing elements R1 / C1 and R2 / C2 integrated in the flip-flops T1 and T2 are connected to the supply voltage for the flip-flops T1 and T2 with their supply lines 16 and 17, respectively, and are connected to the inputs 6a, 7a (flip-flops T1) and 6, 7 (flip-flop T2) switched.
  • Inputs B and C1 are each connected to a fixed voltage (e.g. 5 volts).
  • the Q-dash outputs are not connected.
  • the control gates G3 and G4 (designed as negation modules) are connected to the outputs Q of the flip-flops T1 and T2 in order to adapt the preceding 5-volt logic to the subsequent operating voltage.
  • the control gates G3 and G4 represent an "open collector circuit", which means that the collector circuit is open in a transistor stage.
  • the collector of this output transistor is connected to the operating voltage via the resistor R1 connected outside the IC.
  • the output signal of the "open collector circuit” then shows an "activ-low behavior", i. H. only in the case of the gate, the output of which emits a signal, does the output transistor become live, and as a result the point in question is set to ground potential.
  • the outputs Q of the flip-flops T1 and T2 generate the signals corresponding to the respective length of time designated 18 and 19 (the signal 18 is longer than the signal 19).
  • the inputs 20 and 21 of these control gates G3 and G4 are connected.
  • the series resistors R3 and R4 for the base voltage of the drive transistors T3 and T4 are located at the outputs 22 and 23.
  • the collector 24 of the drive transistor T3 and the collector 25 of the drive transistor T4 are connected to the positive mains voltage + U network (of, for example, plus 18 volts), which is supplied through the phase line 26.
  • the base of the drive transistor T3 or the base for the drive transistor T4 is stabilized to the desired base voltage via the voltage divider resistors R5 and R6, respectively.
  • the emitter 27 is connected via the series resistor R7 to the base of the driver transistor T5 and the emitter 28 via the series resistor R8 to the base of the switching transistor T6 (of the NPN transistor type).
  • the base and emitter 29 of the switching transistor T6 are also present via the voltage divider resistor R9 at an operating voltage minus U-network (of, for example, minus 36 volts) which is negative compared to the basic potential 30.
  • the collector 31 of the switching transistor T6 and the collector 32 of the driver transistor T5 are connected to the positive operating voltage potential (i.e. to plus 18 volts, for example).
  • the reference resistor R10 is switched on between the collector 31 and the emitter 33 and a diode V2 is connected between the latter and the collector 31 of the switching transistor T6, which diode is connected to the base potential 30.
  • the Zener diode V1 is connected to the collector 31 of the switching transistor T6 or to the reference resistor R10 and the diode V2.
  • the Zener diode V1 and the reference resistor R10 together form a current limiting circuit, the reference resistor R10 being connected to the emitter 33 of the driver transistor T5 and the Zener diode V1 lying in parallel with the reference resistor-emitter path.
  • both gates G3 and G4 are opened, whereby the drive transistors T3 and T4 are turned on.
  • a current flows during this period from the positive potential (plus 18 volts) via the line 26 and the drive transistor T4, the series resistor R8 to the base of the switching transistor T6 and the voltage divider resistor R9 to the negative potential (minus 36 volts) and via the drive transistor T3 and the series resistor R7 to the base of the driver transistor T5, so that the current rise in the driver solenoid L begins under increased voltage (54 volts).
  • this steep current increase within the time t1 is shown by the edge 35.
  • a current also flows in the through-connected driver transistor T5 and in the switching transistor T6.
  • the current that rises here is limited by the Zener diode V1 and by the reference resistor R10, so that the current remains very exactly the same for a time period 35 (FIG. 2), the operating voltage after reaching the time value t3 to a lower value (plus 18 Volts) is switched. In this period of time, therefore, only a current flows from the positive potential (plus 18 volts) through the driver magnet coil L1 via the driver transistor T5 and the reference resistor R10 through the diode V2 to the basic potential 30.
  • the pressure pulse 1a drops after the predetermined time t2 and the current intensity drops according to the edge 37 (FIG. 2) to zero.
  • the next pressure pulse 1 a can now be initiated.
  • the pressure pulses take up a time t2 of approximately 200 msec, the time segment t1 for the rising current in the electromagnetic coil L1 being approximately 100 msec.
  • the outer curve 38 forms a current profile without current limitation with residual energy and the inner profile of the current curve 39 forms the current profile theoretically to be achieved without current limitation and without residual energy.
  • the current curve in FIG. 3 results in a significantly lower energy loss (characterized by the hatching there) than the area (also hatched) shown in FIG. 4 according to the current curve without current limitation with residual energy of the driver magnet coil L1.
  • the current in the driver solenoid L1 does not exceed the predetermined value due to the current limitation, even if residual energy from the previous energization is still stored, which would make the current increase faster.
  • FIGS. 3 and 4 consequently does not result in a significantly higher power loss in the driver magnet coil L in comparison to an energization without current limitation according to FIG. 4.
  • the hatched areas in FIGS. 3 and 4 represent the power loss within the Components are converted into heat and a portion of which can also lead to the heating of the transistors.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Stored Programmes (AREA)
  • Dot-Matrix Printers And Others (AREA)
EP82730126A 1981-12-21 1982-09-27 Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart Expired EP0082799B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82730126T ATE31124T1 (de) 1981-12-21 1982-09-27 Treiberschaltung fuer drucker, insbesondere fuer matrixdrucker der nadel- bzw. hammerbauart.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3151242A DE3151242C2 (de) 1981-12-21 1981-12-21 Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart
DE3151242 1981-12-21

Publications (3)

Publication Number Publication Date
EP0082799A2 EP0082799A2 (de) 1983-06-29
EP0082799A3 EP0082799A3 (en) 1984-02-15
EP0082799B1 true EP0082799B1 (de) 1987-11-25

Family

ID=6149631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82730126A Expired EP0082799B1 (de) 1981-12-21 1982-09-27 Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart

Country Status (5)

Country Link
US (1) US4485425A (enrdf_load_stackoverflow)
EP (1) EP0082799B1 (enrdf_load_stackoverflow)
JP (1) JPS58112765A (enrdf_load_stackoverflow)
AT (1) ATE31124T1 (enrdf_load_stackoverflow)
DE (1) DE3151242C2 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6018903A (ja) * 1983-07-12 1985-01-31 Sharp Corp ソレノイド駆動方式
US4667117A (en) * 1984-10-31 1987-05-19 International Business Machines Corporation Self-timing and self-compensating print wire actuator driver
US4630165A (en) * 1985-10-10 1986-12-16 Honeywell Inc. D.C. power control for D.C. solenoid actuators
JP2584442B2 (ja) * 1986-12-12 1997-02-26 キヤノン株式会社 記録装置
US4875409A (en) * 1987-07-01 1989-10-24 Printronix, Inc. Magnetic print hammer actuator protection circuit
DE3904441A1 (de) * 1987-08-12 1990-08-23 Mannesmann Ag Chopperschaltung fuer die ansteuerung von elektromagnet- und/oder schrittmotoren-spulen, insbesondere fuer einen matrixdrucker
ATE82197T1 (de) * 1988-02-05 1992-11-15 Mannesmann Ag Ansteuerung fuer drucker.
JPH02143874A (ja) * 1988-09-16 1990-06-01 Ncr Corp ドツトプリンタの印字制御装置
JPH05286150A (ja) * 1992-03-05 1993-11-02 Internatl Business Mach Corp <Ibm> プリントハンマーコイル電流のモニタ回路及び制御回路

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2515124B1 (de) * 1975-04-07 1976-09-23 Mannesmann Ag Schaltung zur Ansteuerung der Nadelmagnete eines Nadeldruckers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628100A (en) * 1970-09-08 1971-12-14 Data Printer Corp Hammer driving circuits for high-speed printers
US3660730A (en) * 1970-12-16 1972-05-02 Design Elements Inc Solenoid drive circuit
US3859572A (en) * 1973-03-16 1975-01-07 Ibm Magnetic coil driver circuit
SE403539B (sv) * 1976-06-01 1978-08-21 Levin Maskin Ab K E Elektrisk omkopplingsanordnig for anvendning sasom matnigsstromstellare for ett tvapoligt belastningsobjekt
JPS5945209B2 (ja) * 1978-09-14 1984-11-05 沖電気工業株式会社 マグネツト駆動回路
DE2933616C2 (de) * 1979-08-20 1982-09-23 Siemens AG, 1000 Berlin und 8000 München Dämpfungsvorrichtung für einen als Klappankermagnetsystem ausgebildeten elektromagnetischen Antrieb für den Druckhammer in einer Druckhammeranordnung
US4399483A (en) * 1982-02-08 1983-08-16 Chandler Evans, Inc. Solenoid current control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2515124B1 (de) * 1975-04-07 1976-09-23 Mannesmann Ag Schaltung zur Ansteuerung der Nadelmagnete eines Nadeldruckers

Also Published As

Publication number Publication date
JPS58112765A (ja) 1983-07-05
DE3151242C2 (de) 1985-05-02
EP0082799A2 (de) 1983-06-29
ATE31124T1 (de) 1987-12-15
EP0082799A3 (en) 1984-02-15
JPS6359387B2 (enrdf_load_stackoverflow) 1988-11-18
US4485425A (en) 1984-11-27
DE3151242A1 (de) 1983-07-07

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