EP0134258A1 - Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion - Google Patents

Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion Download PDF

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Publication number
EP0134258A1
EP0134258A1 EP83107603A EP83107603A EP0134258A1 EP 0134258 A1 EP0134258 A1 EP 0134258A1 EP 83107603 A EP83107603 A EP 83107603A EP 83107603 A EP83107603 A EP 83107603A EP 0134258 A1 EP0134258 A1 EP 0134258A1
Authority
EP
European Patent Office
Prior art keywords
print
time
stop
hammer
flight
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
EP83107603A
Other languages
German (de)
English (en)
Other versions
EP0134258B1 (fr
Inventor
Armin Dipl.-Phys. Bohg
Horst D. Dipl.-Ing. Matthaei
Volker Dr. Dr.-Ing. Zimmermann
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.)
IBM Deutschland GmbH
International Business Machines Corp
Original Assignee
IBM Deutschland GmbH
International Business Machines Corp
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 IBM Deutschland GmbH, International Business Machines Corp filed Critical IBM Deutschland GmbH
Priority to DE8383107603T priority Critical patent/DE3367879D1/de
Priority to EP83107603A priority patent/EP0134258B1/fr
Priority to JP59122153A priority patent/JPS6122966A/ja
Publication of EP0134258A1 publication Critical patent/EP0134258A1/fr
Priority to US06/842,064 priority patent/US4664543A/en
Application granted granted Critical
Publication of EP0134258B1 publication Critical patent/EP0134258B1/fr
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
    • B41J9/46—Control for hammer-impression mechanisms for deciding or adjusting hammer-firing time

Definitions

  • the invention relates to a device for monitoring the flight time of the print hammers of impact printers, in which the printing process is carried out by moving and striking a print hammer against a passing print-type carrier and a stop plate, the flight time being controlled by a control signal derived from the triggering time and impact time of the respectively monitored hammer Measuring device is determined.
  • the invention can be used for printing units which are known and used in large numbers, in particular in the technology of data processing as output devices, so-called fast printers.
  • the print media used include: Steel strips with etched types or point elements or type wheels are considered.
  • a tape is used as the type carrier in the following, but the explanations as well as the invention relate to all types of impact printers, where individual print hammers strike the moving type carrier.
  • the type carrier i.e. the type band, runs continuously in the direction of the print line.
  • the number of printing points on the recording medium to be printed is determined by the number of printing hammers, provided that these cannot be moved in the line direction. Every print type is offered at every print point of a print line.
  • Each pressure point is assigned a stop device that has a print hammer at the desired time releases, ie when the print type to be printed is at the relevant printing point.
  • the time of flight of the print hammer is the time that lies between the triggering time of the print hammer and the time at which the print hammer hits the recording medium or the stop plate.
  • the flight time changes have a direct impact on the print quality.
  • the flight time of the print hammers serves as a controlled variable, which is influenced via the switch-on time of the print hammer drives, which is effective as a control variable, in such a way that the disturbing variables occurring are compensated for.
  • An arrangement for monitoring the movement of printing hammers can also be found in DE-OS 24 02 895, where a separate displacement sensor is provided for each printing hammer, which detects the hammer movement without contact.
  • the temporal correspondence of the encoder signal with egg The nominal signal which characterizes the correct time range is used in a monitoring circuit to compensate for the differences in flight time.
  • DE-OS 23 53 825 shows an arrangement for aligning the flight times of printing hammers, in which the time of flight correction is compensated for by delay elements in that corresponding correction signals are derived via a stop detector.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, achieves the object of specifying a device for monitoring the flight time of print hammers of impact printers, which enables automatic self-adjustment of the printer without the user expecting test prints, without impairing the other functions of the printer and without taking expensive measures in the area of each printing position.
  • the advantages achieved by the invention are essentially to be seen in the fact that it is possible to do without any mechanical adjustment of the print hammers, so that the maintenance time of printers is drastically reduced, that the test cycles leave no visible traces on recording media, and that the invention also can be used on chain printers, type wheel printers, etc. without significantly changing the device and that, in addition to a stroke detector and a slightly changed print type carrier, only a small amount of memory space in the microprocessor and corresponding program parts are required.
  • the steel strip 20 serving as a printing type support has raised printing types 21 designed in a mirror-image form.
  • the printing types 21 are produced, for example, by etching the steel strip.
  • the decisive feature of this test type 23 is that although it is raised in the same way as the print types 21 themselves, it has an impact surface that is opposite to the the print type 21 is significantly enlarged.
  • the impact area of the test type is so large that a hammer impact does not result in an imprint on the recording medium to be printed, for example a paper web, due to the small surface pressure which arises. An impression is only created if the raised surface of a print type distinguishes a certain value, e.g. 1 mm2. With an area of the test type corresponding to the usual area of the pressure hammers used for attaching, for example 2.5 x 5 mm 2, the area load would be 12 times smaller than required for printing. derlich, so that no mark is made when serving.
  • the test type can have a multiple of the normal print type width / print type height.
  • the test type 23 is connected with the entire rear side to the print type support 20, since like the print types themselves it is produced by etching the steel strip.
  • This type of attachment of the test type 23 can lead to problems, since the flexibility of the print type support can no longer be guaranteed due to the large area and the rigid connection to the print type support.
  • the flexibility must be guaranteed, since the steel strip used as the type carrier is designed as a closed loop, and must be guided around the printing station in constant circulation and must therefore be constantly deflected.
  • test type 23 can be divided into subfields.
  • the exemplary embodiment of the test type 23 shown in FIG. 2A is characterized in that the test type is only firmly connected to a web connection 24, which in turn is only resiliently connected to the print type support 20 via the end 25. Flexibility is also guaranteed here.
  • test type 23 is only connected to the printing type support 20 on one side via a weld seam 26, so that the flexibility is also retained here.
  • the mode of operation of the test type 23 described is described in more detail below with reference to FIG. 3.
  • First of all there is a printing hammer bank with a printing hammer 6 for each possible printing position, for example 132 printing hammers.
  • the print hammer bank is arranged opposite a stop plate or stop rail 1. Between the print hammers 6 and the stop rail 1, starting from the stop rail 1 in parallel guidance, the print type carrier 20, an ink ribbon 3 and the record carrier to be printed, for example a paper web 4, run through the printing station.
  • the print hammer 6 assigned to this print position is triggered, strikes against the paper web 4 and thus via the ink ribbon 3 against the print type support 20 and the stop rail 1.
  • the desired print on the paper web 4 is produced.
  • the triggering of the individual print hammers 6 takes place via respectively assigned triggering circuits 7, which are not described in greater detail and which are controlled via printer electronics 12.
  • the printer electronics 12 itself is in turn via one of those shown in FIGS. 1, 2A and 2B indicated position markings 22 controlled on the sensor 13 sensing the print type carrier 20.
  • the device according to the invention for monitoring the flight time of the print hammers 6 and subsequently the device for automatic adjustment of this flight time will be discussed in more detail below.
  • the flight times result from the time span between the triggering time determined by the trigger circuit 7 and the point of impact on the print type 6 or the stop rail 1.
  • the measurement or adjustment of the flight time can thus be carried out by shifting the triggering time.
  • other parameters can of course also be corrected, such as, for example, the duration or the level of the trigger pulse which is delivered by the trigger circuit 7.
  • the trigger time can be taken directly from the trigger signal.
  • the time of impact is determined by a stop detector 5 permanently installed on the stop rail 1.
  • This stop detector 5 always emits a stop signal when a print hammer strikes the test type 23 which does not produce an impression on the paper web 4.
  • the assignment of the stop signal to a print or hammer position is unambiguous, since only one print hammer is triggered during the measurement or adjustment of the hammer flight time during a test cycle, i.e. All print hammers in order according to the test type that passes the assigned print positions.
  • the stop detector 5 is designed so that it is in each case when a pressure hammer on the Test type 23 responds shock wave occurring in the stop rail 1.
  • the mechanical shock wave can generally be registered in three ways, and accordingly three basic types of impact detectors 5 can be used. These are electrical, optical or mechanical impact detectors. A large number of such impact detectors are known. Because of the technology already in the printer, an electrical method is preferable to the other options. With the electrical method, strain gauges, piezoelectric sensors and capacitive sensors can be used as stop detectors. Strain gauges are available in large numbers and are, for example, already integrated and adjusted together with the associated bridge circuit on foils, so that they can easily be attached to the stop rail 1.
  • Piezo crystals are used in a similar way, in which the required signal amplification is lower than with strain gauges.
  • a capacitive sensor consists of two plates, one of which is an integral part of the stop rail 1 and, for example, is arranged on one end face. The second plate is isolated from the first plate, fixed with respect to the original position and parallel to this first plate at a very short distance.
  • Each mechanical shock wave in the pressure rail 1, which is thus triggered by a stop of a pressure hammer 6 on the test type 23 changes the distance between the two plates of the capacitor and thus its capacitance. This change can either cause a voltage change by bringing the held plate to a higher potential via a high impedance circuit so that rapid discharge is not possible, or one allows the capacitor to act with its capacitance as part of a tuned resonant circuit.
  • the stop signal supplied by the stop detector 5 is fed to an electronic evaluation circuit 8, to which the trigger signals supplied by the trigger circuits 7 are also fed.
  • the electronic evaluation unit 8 determines the print hammer flight time from the time difference between the stop signal and the associated trigger signal and transfers this data to a downstream print hammer flight time memory 9.
  • the output of the print hammer flight time memory 9 is connected via a microprocessor 10 to the inputs of a trigger time memory 11.
  • the output of this memory is connected to the printer electronics 12 already mentioned, the output signals of which control the trigger circuits 7.
  • the hammer flight times are not about maintaining an absolutely always valid, predetermined value, since this value is due to other changing operating parameters of the printer - e.g. Paper thickness setting, printing energy limit, trip coil temperature - cannot give. It is important, on the other hand, that the times of the strokes do not deviate from the times defined in the time diagram of the printing process.
  • the operator When the printer is switched on, the operator will initially set the triggering times manually in such a way that, if possible, all types of print are hit in the center.
  • the hammer flight time measured at this point in time is stored as the average of all print hammers arranged in the printing station. Individual print hammers, whose flight time from this mean value by a be deviates by the correct amount, are adjusted by shifting the triggering time of the other printing hammers with regard to the time of the stop.
  • a hammer flight time adjustment in the form of a continuous automatic corrector will then proceed as follows.
  • a test cycle is triggered at certain predetermined time intervals, for example, at the beginning or end of a form, the printing of an invisible line is inserted using the proposed large-area test type.
  • the flight time measured for each individual print hammer is measured via the electronic evaluation circuit 8 and placed in the print hammer flight time memory 9.
  • the microprocessor 10 then forms the mean value from it, detects deviations that exceed a permitted level, and calculates new triggering times for the individual print hammers.
  • the triggering times of all print hammers are stored in the triggering time memory 11, from which they are made available to the printer electronics 12 controlling the triggering circuits 7.
  • the device according to the invention makes it possible to do without any mechanical adjustment of the print hammers.
  • the automatic measurement and adjustment of the hammer flight times leaves no visible prints and can be done at any time with the record carrier inserted.
  • the print hammers, which are only used sporadically during printing, are constantly checked and, at the time of their release, are always up to date with the printer's current status, e.g. adapted to the changed temperature. This would not be the case if the hammer flight time could only be measured while printing visible prints.
  • the time-of-flight monitoring device which constantly takes all pressure hammers into account, makes it possible to dispense with very complex temperature compensation circuits or constant current sources which normally have to be used.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Impact Printers (AREA)
EP83107603A 1983-08-02 1983-08-02 Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion Expired EP0134258B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8383107603T DE3367879D1 (en) 1983-08-02 1983-08-02 Hammer flight time control for an impact printer
EP83107603A EP0134258B1 (fr) 1983-08-02 1983-08-02 Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion
JP59122153A JPS6122966A (ja) 1983-08-02 1984-06-15 インパクト式プリンタ
US06/842,064 US4664543A (en) 1983-08-02 1986-03-18 Device for monitoring and compensating for changes in the flight time of the print hammers of impact printers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83107603A EP0134258B1 (fr) 1983-08-02 1983-08-02 Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion

Publications (2)

Publication Number Publication Date
EP0134258A1 true EP0134258A1 (fr) 1985-03-20
EP0134258B1 EP0134258B1 (fr) 1986-11-26

Family

ID=8190612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107603A Expired EP0134258B1 (fr) 1983-08-02 1983-08-02 Dispositif de contrôle du temps de vol de marteaux d'impression dans une imprimante à percussion

Country Status (4)

Country Link
US (1) US4664543A (fr)
EP (1) EP0134258B1 (fr)
JP (1) JPS6122966A (fr)
DE (1) DE3367879D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303124A1 (fr) * 1987-08-12 1989-02-15 International Business Machines Corporation Contrôle de temps de vol de marteaux pendant le processus d'impression

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183548B (en) * 1985-11-30 1990-06-13 Burroughs Corp Printing apparatus
JP2894359B2 (ja) * 1990-03-23 1999-05-24 キヤノン株式会社 眼底カメラ
DE4025359A1 (de) * 1990-08-10 1992-02-13 Triumph Adler Ag Verfahren zur einstellung der abdruckenergie einer type und schreibmaschine, drucker o. dgl. zur durchfuehrung des verfahrens
US5046413A (en) * 1990-10-05 1991-09-10 International Business Machines Corp. Method and apparatus for band printing with automatic home compensation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387778A1 (fr) * 1977-04-19 1978-11-17 Oki Electric Ind Co Ltd Imprimante par points avec detecteur de defauts
US4368666A (en) * 1980-01-12 1983-01-18 Hitachi Koki Company, Limited Method and circuit arrangement for controlling print timing in a printing apparatus

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513774A (en) * 1968-07-01 1970-05-26 Ibm Printer hammer compensation
FR2205003A5 (fr) * 1972-10-26 1974-05-24 Honeywell Bull Soc Ind
US3835771A (en) * 1973-05-02 1974-09-17 Burroughs Corp Print train permitting accelerated printing speeds in a line printer
AT347721B (de) * 1974-01-22 1979-01-10 Siemens Ag Anordnung zur ueberwachung der bewegung von druckhaemmern bei einem mechanischen schnell- drucker
US4173927A (en) * 1976-04-01 1979-11-13 U.S. Philips Corporation Printing device
US4347786A (en) * 1979-10-01 1982-09-07 International Business Machines Corporation Impact printer hammer flight time and velocity sensing means
JPS56137985A (en) * 1980-03-29 1981-10-28 Ricoh Co Ltd Erasing method for printed character
JPS5783481A (en) * 1980-11-13 1982-05-25 Fujitsu Ltd Printer
US4425844A (en) * 1982-06-23 1984-01-17 International Business Machines Corporation Home pulse compensation for multiple speed line printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387778A1 (fr) * 1977-04-19 1978-11-17 Oki Electric Ind Co Ltd Imprimante par points avec detecteur de defauts
US4368666A (en) * 1980-01-12 1983-01-18 Hitachi Koki Company, Limited Method and circuit arrangement for controlling print timing in a printing apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, no. 24, 10 March 1982 (1982-03-10), ARMONK, USA, pages 5084 - 5085 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303124A1 (fr) * 1987-08-12 1989-02-15 International Business Machines Corporation Contrôle de temps de vol de marteaux pendant le processus d'impression

Also Published As

Publication number Publication date
EP0134258B1 (fr) 1986-11-26
DE3367879D1 (en) 1987-01-15
US4664543A (en) 1987-05-12
JPS6122966A (ja) 1986-01-31
JPH0417150B2 (fr) 1992-03-25

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