EP0063784A2 - Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique - Google Patents

Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique Download PDF

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Publication number
EP0063784A2
EP0063784A2 EP82103372A EP82103372A EP0063784A2 EP 0063784 A2 EP0063784 A2 EP 0063784A2 EP 82103372 A EP82103372 A EP 82103372A EP 82103372 A EP82103372 A EP 82103372A EP 0063784 A2 EP0063784 A2 EP 0063784A2
Authority
EP
European Patent Office
Prior art keywords
armature
sensor
magnet system
plunger
drive device
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
EP82103372A
Other languages
German (de)
English (en)
Other versions
EP0063784B1 (fr
EP0063784A3 (en
Inventor
Ulrich Dr. Ing. Heider
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0063784A2 publication Critical patent/EP0063784A2/fr
Publication of EP0063784A3 publication Critical patent/EP0063784A3/de
Application granted granted Critical
Publication of EP0063784B1 publication Critical patent/EP0063784B1/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
    • 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
    • B41J9/16—Means for cocking or resetting hammers
    • 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
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means

Definitions

  • the invention relates to a drive device according to the preamble of patent claim 1.
  • Plunger armature magnet systems as a drive device for the print hammer in type printing devices or the printer needles in mosaic printing devices are generally known in printing technology and have been used successfully.
  • Such a plunger magnet system for a type printer is described in DE-OS 28 39 024.
  • the timing of the magnet system is a major problem.
  • the printing speed of the impact printer provided with such a plunger magnet system depends on how quickly it succeeds in returning the print hammer, which is designed as the armature of the magnet system, to its initial position without bouncing after the impression has been taken.
  • the return speed of the armature after the impression has been made in the plunger magnet system and thus the time that elapses before the plunger magnet system can be reactivated depends heavily on the damping experienced by the print hammer on the recording medium.
  • the degree of damping includes strongly dependent on the number of copies used in the printing process.
  • an arrangement in the vicinity of the impression point has the disadvantage that it is no longer possible to actively correct the kinetic energy after the measuring process and before the pressure hammer hits the impression point.
  • print hammer in the following includes both the needles of a mosaic printer and the hammer of a type printing device.
  • the object of the invention is to design a drive device of the type mentioned at the outset in such a way that an exact control with optimum functional reliability is made possible.
  • the senor is connected to a control circuit arrangement which is designed in such a way that when a control signal which is delayed if necessary via a delay element is received and the control signal is returned to its starting position, a brake pulse is triggered.
  • the plunger magnet system essentially consists of an excitation coil 3 and the plunger 4 serving as a drive element for the type wheel 1.
  • the plunger 4 has two non-magnetic ones Guide parts 5 and 6, which together with bushings 7 and 8 prevent the plunger from being pulled radially to the surface 9 of the excitation coil 3 and thus prevented from its actual axial movement.
  • the submersible armature 4 protrudes with its rear part through the bushing 8 and rests against a stop 11 under the action of a return spring 10 in the idle state.
  • a sensor 12 in this case a photoelectric switching device, is made of an infrared light barrier, the photo path being arranged in the range of movement of the plunger 4.
  • the plunger armature magnet is controlled via a control circuit arrangement, which can be designed, for example, in accordance with the block diagram of FIG. 2. It essentially consists of two flip-flops 13 and 14 for timing the circuit arrangement. Switching transistors 15, 16 and 17 connect the magnet coil 3 to a constant voltage source 19 as a function of the output signal of an amplifier 18, which regulates the excitation current with imprint and the braking current in the coil 3.
  • the amplifier 18, which is connected as a current regulator, is also connected its positive output at a voltage divider consisting of the resistors 20 to 24 and the associated switching transistor 25.
  • the resistor 20 is designed as a potentiometer.
  • the negative input of the amplifier 18 is connected to a measuring resistor 27 for determining the actual value of the current in the coil 3.
  • the other resistors 28 to 32 are used in a known manner to adapt the switching transistors.
  • the monostable multivibrator 14 is connected via a delay element 33 to the output of the photoelectric switching device 12 linked.
  • the circuit arrangement is controlled via a pulse 34 triggered, for example, by a keyboard (not shown here).
  • the flip-flops 13 and 14 are connected via an OR gate 35 to the control input of the switching transistor 17.
  • the drive device has an armature control device 36. It contains a measuring element 27 linked to the pulse input 34 and the sensor 12 and a comparison control device 30 provided with a memory 38 and a comparator 39, the output of which is connected to the reset input of the flip-flop 13.
  • a e.g. Functional warning device 41 in the form of a warning lamp is linked to timer 37. Their function will be explained later. The same applies to the measuring element 42 required for the basic setting of the impression energy after the immersion armature magnet system has been installed in the pressure device.
  • FIG. 3 shows the upper pulse train the course of the excitation pulses at the output of the OR gate 35 and the lower pulse train the course of the excitation pulses at the output of the sensor 12.
  • flip-flop 13 is set via the start pulse input at input 34 and the control path of transistors 17 and 25 is thus interrupted via OR gate 35. This makes the current control device effective.
  • the switching transistor 16 and the power transistor 15 become conductive, as a result of which the current in the excitation coil 3 increases suddenly up to the maximum value determined by the control device.
  • the armature 4 is accelerated under the effect of the magnetic field generated.
  • the timer 37 of the armature control device 36 begins, which e.g. can be designed as a counter, its operation.
  • the light barrier opens and a rectangular pulse with a falling edge occurs at the output of sensor 12. This rectangular pulse stops the time measuring element 37 and the result of the measurement is fed to a comparison control device 40.
  • This comparison control device 30 can e.g. be designed as a microprocessor and contains a memory 38 with associated central control unit 39.
  • the one from the anchor from the stop to the light barrier. continuous path per unit of time is a measure of the pressure energy applied. If the throughput time determined by the time measuring element 37 differs from the target time stored in the memory 38, then the central unit 39 accordingly controls the resetting of the flip-flop 13 at the time T3. At time T3, the flip-flop 13 is returned to its original position. The transistors 17 and 25 thus become conductive again, the current regulation being interrupted and the power transistor 15 being switched off. The armature control device 36 thus controls the time length of the activation of the transistor 15 and thus the excitation current in the coil 3 via the flip-flop 13.
  • the output signal of the sensor 12 delayed by the time At via the timing element 33 activates the monostable flip-flop 14 that can be set with a rising pulse edge that at time T5 interrupts the switching transistor 17 again via the OR gate 35 and thus activates the coil 3.
  • Sistor 25 is in the conductive state because of the flip-flop 13, so that the amplifier 18 regulates the excitation current in the coil 3 to a lower braking current in this case.
  • the armature 4 is braked completely by this braking current and can contact the stop 11 without reverberation.
  • the monostable multivibrator 14 tilts back into its original position, making the transistor 17 conductive again and thus interrupting the excitation current in the coil 3 via the power transistor 17.
  • Another impression cycle can be started by a new start pulse 35.
  • the circuit arrangement is also equipped with a function warning device 41.
  • This function warning device is connected, for example, to the time measuring element 37 and then emits a warning signal if the end of the armature 4 does not pass the light barrier 12 within a specific time period after the immersion armature magnet system has started.
  • Exceeding this time period indicates a malfunction of the plunger magnet system. This can be, for example, a break in the armature or a defect in the excitation coil.
  • the time of an entire impression cycle instead of the time span, that is to say the two interruptions of the light barrier as a measure of a functional warning device.
  • the function warning device itself can consist of a comparator which compares the counter reading of the time measuring element 37 with a stored target value and activates a warning device when exceeded. :
  • the control circuit arrangement has a potentiometer 20, by means of which the maximum excitation current in the coil 3 can be set.
  • a measuring element 42 can be coupled to the output of the sensor 12, which e.g. can consist of a time measuring device with associated display device, via which the throughput time of the armature is measured from the initial interruption of the light barrier to the interruption of the light barrier when the armature returns to the starting position.
  • This throughput time of the armature is a measure of the impression energy, and in the basic setting of the plunger armature magnet system after installation in the pressure device, one can compare this time with a predetermined target time and make a basic setting of the excitation current in the coil 3 by changing the potentiometer 20.
  • the design of the drive device is not limited to the example shown. Other embodiments are also conceivable for the individual elements.
  • the sensor 12 can e.g. can also be an element that detects the movement of the armature by induction, or two sensors can be arranged in the armature path.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
EP19820103372 1981-04-24 1982-04-21 Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique Expired EP0063784B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3116430 1981-04-24
DE19813116430 DE3116430C2 (de) 1981-04-24 1981-04-24 Hammerdruckvorrichtung mit einem einen optoelektronischen Sensor enthaltenden Tauchankermagnetsystem

Publications (3)

Publication Number Publication Date
EP0063784A2 true EP0063784A2 (fr) 1982-11-03
EP0063784A3 EP0063784A3 (en) 1985-01-09
EP0063784B1 EP0063784B1 (fr) 1987-07-01

Family

ID=6130796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820103372 Expired EP0063784B1 (fr) 1981-04-24 1982-04-21 Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique

Country Status (2)

Country Link
EP (1) EP0063784B1 (fr)
DE (1) DE3116430C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3346133A1 (de) * 1983-12-21 1985-07-04 Ibm Deutschland Gmbh, 7000 Stuttgart Automatische flugzeitmessung in anschlagdruckern
US4678355A (en) * 1985-07-02 1987-07-07 Xerox Corporation Print tip contact sensor for quiet impact printer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547087A (en) * 1983-01-20 1985-10-15 Siemens Aktiengesellschaft Microprocessor-controlled printing mechanism having an opto-electronic sensor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2130804A5 (fr) * 1971-02-23 1972-11-10 Nortec Computer Devices
AU521251B2 (en) * 1977-09-14 1982-03-25 Exxon Research And Engineering Company Hammer for impact printer
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
US4347786A (en) * 1979-10-01 1982-09-07 International Business Machines Corporation Impact printer hammer flight time and velocity sensing means
US4429342A (en) * 1981-04-24 1984-01-31 Siemens Aktiengesellschaft Impact printing device with an improved print hammer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3346133A1 (de) * 1983-12-21 1985-07-04 Ibm Deutschland Gmbh, 7000 Stuttgart Automatische flugzeitmessung in anschlagdruckern
US4678355A (en) * 1985-07-02 1987-07-07 Xerox Corporation Print tip contact sensor for quiet impact printer

Also Published As

Publication number Publication date
EP0063784B1 (fr) 1987-07-01
DE3116430C2 (de) 1983-03-31
EP0063784A3 (en) 1985-01-09
DE3116430A1 (de) 1982-11-18

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