EP0020975A1 - Steuerschaltung für die Stromzufuhr zu einer Wicklung und ihre Verwendung in einer Druckvorrichtung - Google Patents

Steuerschaltung für die Stromzufuhr zu einer Wicklung und ihre Verwendung in einer Druckvorrichtung Download PDF

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Publication number
EP0020975A1
EP0020975A1 EP80102566A EP80102566A EP0020975A1 EP 0020975 A1 EP0020975 A1 EP 0020975A1 EP 80102566 A EP80102566 A EP 80102566A EP 80102566 A EP80102566 A EP 80102566A EP 0020975 A1 EP0020975 A1 EP 0020975A1
Authority
EP
European Patent Office
Prior art keywords
current
winding
printing
level
predetermined level
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
EP80102566A
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English (en)
French (fr)
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EP0020975B1 (de
Inventor
Vincent Dennis Mccarty
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.)
International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0020975A1 publication Critical patent/EP0020975A1/de
Application granted granted Critical
Publication of EP0020975B1 publication Critical patent/EP0020975B1/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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
    • 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
    • B41J9/50—Control for hammer-impression mechanisms for compensating for the variations of printer drive conditions, e.g. for compensating for the variation of temperature or current supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • the present invention relates to solenoid control systems in general, and more particularly to systems which include a solenoid control system in which the duration and force of the output of the solenoid regardless of voltage variations must be precisely controlled.
  • the present invention relates more particularly to the precise control of an impact printer operating at high speed and controlled by a solenoid, enabling quality printing to be obtained.
  • U.S. Patent No. 3,712,212 discloses an impact printer in which the striking force varies depending on the printing surface of the character to be printed.
  • a rotary printing drum or wheel or an endless printing belt is used in combination with one or more printing hammers for printing on a printing medium.
  • the electromagnetic field produced by the solenoid triggers the flight of the hammer against the document to be printed.
  • the problem of striking the hammer is treated as a function of the printing surface of the characters, no attempt is made to vary the striking force of the hammer, in order to compensate for the variations in tension of food.
  • the impulse applied to the winding of the hammer solenoid is effective from its application without taking into account possible variations in its rise time, caused by fluctuations in the supply voltage or variations in inductance.
  • US-A-No. 3,866,533 discloses another system for varying the striking force applied by a striking hammer.
  • the width of the pulse applied to the hammer solenoid is varied according to the thickness of the forms on which printing is performed.
  • This patent also presents a technique for regulating the input voltage to reduce variations in the hammer strike force to a minimum.
  • this patent does not deal with the chronology of the printing pulse from the moment when a predetermined current level is reached in the winding of the solenoid, in order to eliminate the problems posed by the voltage variation.
  • US-A-No. 4,030,591 also discloses a hammer hammer control circuit.
  • the hammer is synchronized according to the speed printing.
  • the triggering of the hammer is still based on the moment of reception of a pulse.
  • the timing of the pulse is based on the printing speed. No attempt is made to command the hammer after receipt of the conditioning pulse.
  • the duration of the pulse is also counted from the start of the excitation of the hammer winding and not from the moment when the current in the winding reaches a predetermined level. Thus, variations in the rise time can severely affect the system presented in this patent.
  • the device of the present invention consists of a solenoid control circuit excited by a power supply with inherent voltage variations.
  • the excitation current is applied to the winding and the current level in the winding is detected. After the current level in the winding has reached a predetermined maximum level, a timing circuit is initiated to control the duration of the application of the maximum current.
  • Variations in the supply voltage have little effect on the net electromagnetic field produced by the winding since the entire chronology is based on the instant when the level of the predetermined control current is reached, unlike the chronology which includes the rise time of the control current signal.
  • the effects of inductance variations in solenoid type systems can also be offset by the use of the appropriate chronology.
  • a solenoid control circuit is used in a daisy-shaped print wheel printer to precisely control the flight time, the strike force and the duration of its application by a hammer mounted on winding.
  • Figure 1 shows the main mechanical components of a printing system. They are shown schematically since they are well known in the prior art and the present invention relates to the control system of the hammer hammer control circuit. It is obvious that the system of the present invention could be used for other applications.
  • a laterally sliding carriage 1 is mounted on a guide rod la and a worm 7 and carries a wheel or a rotary printing disc 2 driven by a stepping motor 3.
  • the carriage 1 is driven by the worm 7, even driven by a stepping motor 8.
  • the motor 8 could also drive a belt, which, in turn, would drive the carriage 1.
  • the printing wheel 2 is formed of a disc comprising a certain number of movable elements with character, for example in the form of flexible radial tongues 9A, 9B, 9C, etc., each bearing a printing character.
  • the impression of a desired character is caused by the actuation of a striking hammer 10 controlled by a solenoid 11, these two elements being mounted on the carriage 1.
  • a striking hammer 10 controlled by a solenoid 11
  • a transmitting wheel 13 fixed to the printing wheel 2 and rotating with the latter operates in association with a detector FB2 to generate a current of transmitter indexing pulses controlling the operation of the printer.
  • the emitting wheel 13 comprises a series of teeth each corresponding to one of the tongues 9A, 9B, 9C, etc.
  • a reference pulse is generated at each revolution of the printing wheel by a single tooth on another emitter (not shown).
  • the printer commands can thus determine at any time the angular position of the print wheel 2 by counting the pulses received since the last reference pulse.
  • a notched transmitter 15 is mounted on the shaft of the motor 8 and, in association with a detector FB1, delivers pulses which indicate the position of the carriage 1.
  • Stepper motors 3 and 8 are energized by conventional control circuits 21 and 22.
  • US-A-No. 3,636,429 presents examples of this type of control circuit which can be used.
  • a hammer solenoid 11 is actuated by a hammer control circuit 23 which constitutes the object of the present invention.
  • Figure 2 taken from US-A-No. 3,866,533 shows the variation in pulse width caused by variations in the supply voltage.
  • the curves shown in Figure 2 are for 1, 3 or 6 forms.
  • the figure shows that a variation of the supply voltage from 22 to 23 volts causes a variation of the width of the pulse of approximately 100 microseconds.
  • the systems of the prior art try to vary the duration of the pulse applied to the solenoid controlling the hammer according to the different prints, the number of forms to be printed, etc.
  • its chronology is established from the start of its application to the winding of the solenoid without taking into account the effect brought to the duration of said pulse by the variations of the supply voltage while the pulse is rising.
  • FIG. 3 is a graphic representation of the problem associated with variations in supply voltage during the rise of the pulse, appearing when said pulse is synchronized from the moment of application of the voltage to the winding.
  • Figure 3 shows that a relatively high voltage applied to the winding will obviously cause a relatively rapid rise which, in turn, will cause a time of application of the maximum current relatively long compared to the time T2 measured from the moment where the nominal current in the winding reaches a predetermined level.
  • FIG. 3 further shows that the application of a relatively low voltage to the winding causes an application time to the winding of the relatively low maximum current compared to the duration of T2.
  • the graph in Figure 3 simply shows that variations in voltage during the signal rise can cause significant variations in the time of application of the maximum current to the winding.
  • the chronology of the application of the signal to the winding is established from the moment when the signal reaches its maximum selected current unlike prior art devices in which it is established from 'moment when the current is initially applied to the winding. It has been shown that extremely precise control of the electromagnetic field produced can be ensured by establishing the chronology from the application of the maximum current to the winding instead of establishing it from the initial application of said current.
  • FIG. 4 represents an example of a circuit making it possible to establish the chronology of a signal applied to a winding for a preselected time from the moment when a preselected maximum current is reached.
  • FIG. 4 shows that the AND gate 25 receives a signal A by the line 24.
  • the signal A is simply the control signal coming from the system, indicating that the hammer must be triggered.
  • Gate A receives its other conditioning signal D via line 42. Signal D will be described later.
  • the output of the AND gate 25 is applied by the line 26 to the AND gate 27 which receives its other conditioning input C from the chronology unit 41.
  • the AND gate 27 delivers an output by the line 28 to the transistor switch 29
  • Switch 29 is simply a conventional transistor current switch.
  • the switch 29 connects the winding 30 to ground.
  • the switch 29 is also connected by line 31 through the resistor 32 to ground to complete the winding current circuit.
  • Resistor 32 is a detection resistance crossed by a detected current and applied by lines 33 and 34 to a comparator 35.
  • Comparator 35 also receives an input by line 36 to from a current reference unit 37. The current flowing in the detection resistor 32 is compared to the predetermined current delivered by the unit 37. When the current flowing in the resistor 32 is equal to the reference current unit 37, this equality is noted and an output signal B is generated.
  • This output signal is applied to the chronology unit 41 by the line 39 and to the oscillator 40 by the line 38.
  • the output of the oscillator 40 is applied to the line 42.
  • the priming signal coming from the control logic of the printer or any other system is applied by line 24 to the AND gate 25.
  • This signal is the signal A in FIG. 5.
  • the signal D coming from the oscillator 40 is at the high level and therefore the AND gate 25 applies a positive logic level via line 26 to the gate.
  • AND 27 The other input of the AND gate 27 receives the signal C from the chronology unit 41.
  • the signal C coming from the chronology unit 41 is again at this instant at a positive logic level which causes the application of a positive logic level by line 28 to the transistor switch 29.
  • the transistor switch 29 is a conventional transistor switch and the application of a positive potential by line 28 causes the transistor to conduct for application of current through winding 30 of the positive potential at mass e.
  • the current begins to flow in the winding 30 which is the control winding of the solenoid.
  • the resistor 32 which is, as indicated above, a detection resistor.
  • the current flowing in the detection resistor 32 is applied to the comparator 35 where it is compared to the reference current applied to the line 36 by the reference current unit 37.
  • the comparator 35 delivers the signal B which is applied by line 38 to the oscillator 40 and by line 39 to the chronology unit 41.
  • the chronology unit 41 begins a count based on the selected instant.
  • the chronology unit 41 is a single shot for the sake of simplicity and the instant selected will be that required for the application concerned.
  • the signal B applied by the line 38 will cause the start of oscillation of the oscillator 40.
  • the obvious function of the oscillator 40 is to deliver conditioning pulses to the system to prevent any overshooting of the current.
  • it provides by line 42 the conditioning and the unconditioning of the AND gate 25 and therefore of the transistor 29 to supply the sawtooth winding current signal represented in FIG. 5.
  • the invention consists of a hammer control circuit controlled by a power supply having inherent voltage variations.
  • the control signal is applied to the hammer winding and the current level in the winding is detected. After the current level in the winding reaches a predetermined level, the timing circuit is energized to establish the length of the signal.
  • Variations in the supply voltage do not affect the impact hammer since the entire chronology is based on the instant when the predetermined level of the control current is reached, unlike the chronology which includes the signal rise time control.
  • variations inductance can be compensated for by varying the duration of the current pulse.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Impact Printers (AREA)
EP80102566A 1979-06-25 1980-05-09 Steuerschaltung für die Stromzufuhr zu einer Wicklung und ihre Verwendung in einer Druckvorrichtung Expired EP0020975B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51580 1979-06-25
US06/051,580 US4293888A (en) 1979-06-25 1979-06-25 Print hammer drive circuit with compensation for voltage variation

Publications (2)

Publication Number Publication Date
EP0020975A1 true EP0020975A1 (de) 1981-01-07
EP0020975B1 EP0020975B1 (de) 1984-09-12

Family

ID=21972166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102566A Expired EP0020975B1 (de) 1979-06-25 1980-05-09 Steuerschaltung für die Stromzufuhr zu einer Wicklung und ihre Verwendung in einer Druckvorrichtung

Country Status (9)

Country Link
US (1) US4293888A (de)
EP (1) EP0020975B1 (de)
JP (1) JPS566414A (de)
AU (1) AU528768B2 (de)
BR (1) BR8003943A (de)
CA (1) CA1138803A (de)
DE (1) DE3069131D1 (de)
ES (1) ES8102509A1 (de)
IT (1) IT1148840B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0067936A3 (en) * 1981-06-18 1984-04-04 International Business Machines Corporation Chopping drive circuit for an electromagnetic print hammer or the like
EP0088769A4 (de) * 1981-08-27 1984-10-29 Motorola Inc Steuerschutzschaltungen mit minimalem leistungsverlust für induktive belastungen.
EP0067937B1 (de) * 1981-06-18 1986-07-30 International Business Machines Corporation Vielfachzerhacker-Treiberschaltung für einen elektromagnetischen Druckhammer oder Ähnliches

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JPS56106852A (en) * 1980-01-31 1981-08-25 Arai Pump Mfg Co Ltd Product obtained through sintering of rubber adhered to metal ring
US4363068A (en) * 1980-08-18 1982-12-07 Sundstrand Corporation Power FET short circuit protection
US4384520A (en) * 1980-09-16 1983-05-24 Hitachi Koki Company, Limited Device for controlling solenoids of high speed printer
US4327406A (en) * 1980-10-01 1982-04-27 The United States Of America As Represented By The Secretary Of The Army DC to AC synthesizer with inverter circuit failure avoidance
US4358812A (en) * 1981-02-04 1982-11-09 Motorola, Inc. Driver circuit for use with inductive loads or the like
US4384716A (en) * 1981-02-05 1983-05-24 Universal Research Laboratories, Incorporated Flipper control circuit
DE3139987A1 (de) * 1981-10-08 1983-04-28 Robert Bosch Gmbh, 7000 Stuttgart Steuereinrichtung fuer einen elektromagnetischen verbraucher in einem kraftfahrzeug, insbesondere ein magnetventil oder ein stellmagnet
DE3204234C2 (de) * 1981-10-13 1985-08-29 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Schaltungsanordnung zur Steuerung eines Relais
US4440079A (en) * 1982-01-11 1984-04-03 International Business Machines Corporation Control system for timing hammers of impact printers
US4399483A (en) * 1982-02-08 1983-08-16 Chandler Evans, Inc. Solenoid current control
FR2536904B1 (fr) * 1982-11-29 1985-11-08 Merlin Gerin Circuit electronique de commande d'un appareillage a fonctionnement multiple equipe d'un mecanisme a electro-aimant
US4516185A (en) * 1983-09-30 1985-05-07 Siemens-Allis, Inc. Time ratio control circuit for contactor or the like
GB8402470D0 (en) * 1984-01-31 1984-03-07 Lucas Ind Plc Drive circuits
US4706561A (en) * 1984-10-25 1987-11-17 Genicom Corporation Printing activator test circuit generating back EMF
US4667117A (en) * 1984-10-31 1987-05-19 International Business Machines Corporation Self-timing and self-compensating print wire actuator driver
US4683817A (en) * 1986-05-20 1987-08-04 Ncr Corporation Dot matrix print head energy control circuit
DE3620535A1 (de) * 1986-06-19 1987-12-23 Mannesmann Ag Elektronische steuerschaltung, insbesondere fuer einen drucker
US4736267A (en) * 1986-11-14 1988-04-05 Motorola, Inc. Fault detection circuit
US4894614A (en) * 1986-12-24 1990-01-16 Ncr Corporation Apparatus for measuring the center-to-center distance between point wires of print solenoids
US4907901A (en) * 1986-12-24 1990-03-13 Ncr Corporation Method and apparatus for measuring displacement of a moveable member of an electromagnetic device by using perturbations in the device's energizing current
JPH02196673A (ja) * 1988-10-28 1990-08-03 Oki Electric Ind Co Ltd ワイヤドット印字ヘッドの駆動装置
US5204802A (en) * 1988-11-23 1993-04-20 Datacard Corporation Method and apparatus for driving and controlling an improved solenoid impact printer
DE68926750T2 (de) * 1988-11-23 1997-02-20 Datacard Corp Verfahren und vorrichtung zum antreiben und steuern eines verbesserten solenoidschlagdruckers
US5214558A (en) * 1991-10-25 1993-05-25 International Business Machines Corporation Chopper drive control circuit
US5406439A (en) * 1993-03-05 1995-04-11 Molex Incorporated Feedback of relay status
US5655770A (en) * 1995-09-15 1997-08-12 Capcom Coin-Op, Inc. Pinball solenoid power control system
US5657987A (en) * 1995-09-15 1997-08-19 Capcom Coin-Op, Inc. Pinball solenoid power control system
ES2129000B1 (es) * 1997-07-17 1999-11-16 Proyectos Y Fabricacion Electr Sistema de marcado por solenoide por puntos y rayado.
US6061224A (en) * 1998-11-12 2000-05-09 Burr-Brown Corporation PWM solenoid driver and method
US6758547B2 (en) 2002-07-10 2004-07-06 Lexmark International, Inc. Method and apparatus for machine specific overcurrent detection

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US3628102A (en) * 1969-10-06 1971-12-14 Ncr Co Exciter apparatus for impact member solenoid
US3909681A (en) * 1973-11-28 1975-09-30 Honeywell Inf Systems Driving circuit for printing electromagnet
FR2295543A1 (fr) * 1974-12-20 1976-07-16 Honeywell Inf Systems Italia Circuit d'excitation pour electro-aimant d'impression

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DE2132717A1 (de) * 1971-07-01 1973-01-18 Bosch Gmbh Robert Ansteuerschaltung fuer magnetventile hoher schaltgeschwindigkeit, insbesondere einer hydraulischen stelleinrichtung
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628102A (en) * 1969-10-06 1971-12-14 Ncr Co Exciter apparatus for impact member solenoid
US3909681A (en) * 1973-11-28 1975-09-30 Honeywell Inf Systems Driving circuit for printing electromagnet
FR2295543A1 (fr) * 1974-12-20 1976-07-16 Honeywell Inf Systems Italia Circuit d'excitation pour electro-aimant d'impression

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0067936A3 (en) * 1981-06-18 1984-04-04 International Business Machines Corporation Chopping drive circuit for an electromagnetic print hammer or the like
EP0067937B1 (de) * 1981-06-18 1986-07-30 International Business Machines Corporation Vielfachzerhacker-Treiberschaltung für einen elektromagnetischen Druckhammer oder Ähnliches
EP0088769A4 (de) * 1981-08-27 1984-10-29 Motorola Inc Steuerschutzschaltungen mit minimalem leistungsverlust für induktive belastungen.

Also Published As

Publication number Publication date
JPS566414A (en) 1981-01-23
IT8022710A0 (it) 1980-06-11
IT1148840B (it) 1986-12-03
DE3069131D1 (en) 1984-10-18
AU528768B2 (en) 1983-05-12
US4293888A (en) 1981-10-06
ES492706A0 (es) 1981-01-16
JPS6159648B2 (de) 1986-12-17
BR8003943A (pt) 1981-01-13
CA1138803A (en) 1983-01-04
AU5787180A (en) 1981-01-08
EP0020975B1 (de) 1984-09-12
ES8102509A1 (es) 1981-01-16

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