EP0024619B1 - Dämpfungsvorrichtung für den elektromagnetischen Antrieb des Druckhammers in einer Druckhammeranordnung - Google Patents

Dämpfungsvorrichtung für den elektromagnetischen Antrieb des Druckhammers in einer Druckhammeranordnung Download PDF

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Publication number
EP0024619B1
EP0024619B1 EP80104739A EP80104739A EP0024619B1 EP 0024619 B1 EP0024619 B1 EP 0024619B1 EP 80104739 A EP80104739 A EP 80104739A EP 80104739 A EP80104739 A EP 80104739A EP 0024619 B1 EP0024619 B1 EP 0024619B1
Authority
EP
European Patent Office
Prior art keywords
hammer
lever
armature
stop
armature lever
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
EP80104739A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0024619A1 (de
Inventor
Dieter Treiber
Adam Kling
Ulrich Dr. 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
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0024619A1 publication Critical patent/EP0024619A1/de
Application granted granted Critical
Publication of EP0024619B1 publication Critical patent/EP0024619B1/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
    • B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements

Definitions

  • the invention relates to a damping device for an electromagnetic drive designed as a hinged armature magnet system for the print hammer of a print hammer arrangement with a magnetic coil generating a magnetic field and a slidable against the action of a return spring and thereby accelerating the hammer against a print hammer return spring, in its rest position spring-loaded against one of its damping Rebound-supporting stop supporting armature lever.
  • type disks are arranged as impression-generating devices, which are actuated by a printing hammer.
  • the drive for such a print hammer must be designed so that the print hammer returning to its starting position after the impression is at rest in the shortest possible time after reaching the starting position, so that the next printing process can begin immediately. For this purpose, it is necessary to withdraw the kinetic energy from the print hammer in the shortest possible time.
  • a device for the abrupt stopping of rapidly moving masses in mechanical printers is known, a bounce mass being provided on which the mass to be stopped impacts.
  • the bouncing mass is coupled to a fixed frame via a holder made of a damping material so that it can swing around the rest position of the holder and is dimensioned such that it largely takes over the kinetic energy of the mass to be stopped.
  • a device is of relatively complex construction and is therefore unsuitable for printing hammer arrangements of the type mentioned at the outset.
  • the plastic-metal pairings can lead to adhesion effects when the hinged armature magnet system is actuated.
  • damping device Another disadvantage of the damping device is that an energy store is arranged in the damping device in the form of a spring element which, when the pressure hammer returns to its starting position, dampens the pressure hammer, but subsequently releases the absorbed energy again, resulting in bruises of the print hammer despite the friction-intensive layer.
  • the object of the invention is to make a damping device for a hinged armature magnet system as simple and inexpensive as possible, so that when a print hammer returns to its starting position after the impression has been taken, the print hammer does not bounce.
  • a rotatably mounted angle lever is provided, one of which an arm provided with a stop surface lies in the movement range of the anchor lever and forms the stop, and that when the anchor lever has fallen off, the other arm of the angle lever provided with a run-up surface is at Swiveling the same by the armature lever returning to its rest position in front of the print hammer, laterally applied to the print hammer as a friction brake.
  • the damping device according to the invention results in an optimal damping curve for the entire hinged armature magnet system, namely in that the returning pressure hammer presses the armature lever against the stop surface of the rotatably mounted angle lever.
  • the stop force on the stop surface is converted by the angle lever into a frictional force on the contact surface, in accordance with and depending on the rebound energy. This results in a damping of the pressure hammer that is adapted as a function of the rebound energy.
  • both the run-up surface and the rear part of the print hammer are made of metal, there can be neither adhesion effects nor wear.
  • the print hammer arrangement shown in FIG. 1 consists of an actual print hammer 1, an associated armature lever 2, the magnet coils 3 actuating the armature lever and an angle lever 5 provided with a stop surface 4.
  • the relatively high excitation current of the solenoid coil IER is switched back to a holding current IH.
  • the holding current IH is dimensioned such that it just overcomes the effect of the return spring 6 and holds the armature lever 2 on the pole faces of the magnetic coils 3.
  • the print hammer 1 If the print hammer 1 returns to its rest position, it strikes the tightened armature lever 2, overcomes the holding force of the armature lever on the pole face of the magnet coils 3 and transfers a certain part of its kinetic energy to the armature lever 2 in such a way that the armature lever moves back together with the print hammer 1 to the starting position, but the armature lever 2 clearly reaches the stop surface 4 of the angle lever 5 in front of the print hammer 1. It should be noted that the print hammer never reaches the stop surface 4 directly, but only an end position (rest position) given by the stop surface 4 and the armature lever 2.
  • the angle lever 5 rotates and thus pivots the arm 9 provided with a run-up surface into the range of motion of the returning hammer 1.
  • the print hammer 1 runs on this run-up surface 8 and is therefore additionally braked.
  • the range of motion of the angle lever 5 is limited overall by a stop surface 10 arranged on the arm 9 of the angle lever 5.
  • This movement sequence described is generated with the aid of the circuit arrangement shown in FIG. 2. It essentially consists of two monostable multivibrators 11 and 12 for the time control of the circuit arrangement.
  • Switching transistors 13, 14 and 15 connect the magnet coils 3 to a constant voltage source 17 as a function of the output signal of an amplifier 16, which regulates the excitation current IER and the holding current IH.
  • the amplifier 16, which is connected as a current regulator is connected to its positive input a voltage divider consisting of the resistors 18 to 22 and the associated switching transistor 23.
  • the negative input of the amplifier 16 is applied to a measuring resistor 25 for determining the actual value of the current in the coils 3a.
  • the other resistors 26 to 30 are used in a known manner for matching the switching transistors.
  • the monostable multivibrators 11 and 12 are set via the start pulse applied to input 31.
  • the switching transistor 13 thus opens via the transistors 15, 14 and the coil 3 is applied to the voltage source 17.
  • the current increases suddenly up to the value of the excitation current IER.
  • the armature lever 2 and the pressure hammer 1 are accelerated under the effect of the generated magnetic field, the armature lever 2 colliding with the pole faces of the magnet coils 3 or against the stop 32 at time T2 and the pressure hammer 1 therefore detaching from the armature lever 2.
  • the monostable multivibrator 12 tilts in accordance with the curve K12 of FIG. 3 and is switched back to the holding current IH.
  • the print hammer 1 rebounding from the impression point strikes the armature lever 2 at time T3 and thereby gives it an impact.
  • the armature lever 2 releases from the magnetic coils 3 and strikes the stop surface 4 at the time T4.
  • the print hammer 1 itself is braked via the angle lever 5, at about this point the holding current IH is also switched off when the monostable flip-flop 11 returns to its starting position.
  • the armature lever 2 now bounces off the stop surface 4 and strikes the print hammer 1 at the time T5.
  • the print hammer 1 is braked even more so that both the armature lever 2 and the print hammer 1 have reached their starting position again at time T6 and are at rest.
  • the level of the holding current can dim be based on the fact that the returning hammer 1 loosens the anchor lever that is still tightened, but that it is tightened again before it reaches the stop surface 4 and collides with the subsequent hammer 1.
  • the moments of inertia of the pressure hammer and the armature lever 2 must be matched to one another in such a way that after a few hits, the pressure hammer 1 and the armature lever 2 together reach the stop surface 4 at a low speed. When the stop surface 4 is reached, the holding current is switched off.

Landscapes

  • Impact Printers (AREA)
EP80104739A 1979-08-20 1980-08-11 Dämpfungsvorrichtung für den elektromagnetischen Antrieb des Druckhammers in einer Druckhammeranordnung Expired EP0024619B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2933616 1979-08-20
DE2933616A DE2933616C2 (de) 1979-08-20 1979-08-20 Dämpfungsvorrichtung für einen als Klappankermagnetsystem ausgebildeten elektromagnetischen Antrieb für den Druckhammer in einer Druckhammeranordnung

Publications (2)

Publication Number Publication Date
EP0024619A1 EP0024619A1 (de) 1981-03-11
EP0024619B1 true EP0024619B1 (de) 1983-10-12

Family

ID=6078838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104739A Expired EP0024619B1 (de) 1979-08-20 1980-08-11 Dämpfungsvorrichtung für den elektromagnetischen Antrieb des Druckhammers in einer Druckhammeranordnung

Country Status (12)

Country Link
US (1) US4329921A (da)
EP (1) EP0024619B1 (da)
JP (1) JPS6026716B2 (da)
AR (1) AR228855A1 (da)
AU (1) AU520974B2 (da)
BR (1) BR8005274A (da)
CS (1) CS225141B2 (da)
DE (1) DE2933616C2 (da)
DK (1) DK356780A (da)
MX (1) MX147871A (da)
SU (1) SU919612A3 (da)
ZA (1) ZA805075B (da)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3116430C2 (de) * 1981-04-24 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Hammerdruckvorrichtung mit einem einen optoelektronischen Sensor enthaltenden Tauchankermagnetsystem
US4429342A (en) 1981-04-24 1984-01-31 Siemens Aktiengesellschaft Impact printing device with an improved print hammer
DE3116402C2 (de) * 1981-04-24 1983-07-21 Siemens AG, 1000 Berlin und 8000 München Rückprallarmes Tauchankermagnetsystem
DE3151242C2 (de) * 1981-12-21 1985-05-02 Mannesmann AG, 4000 Düsseldorf Treiberschaltung für Drucker, insbesondere für Matrixdrucker der Nadel- bzw. Hammerbauart
JP2803258B2 (ja) * 1989-01-27 1998-09-24 セイコーエプソン株式会社 ワイヤドット型印字ヘッドの駆動回路

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204187A (en) * 1940-06-11 Time recorder
GB674812A (en) * 1949-11-18 1952-07-02 Ncr Co Rebound dampening devices for printing hammers
GB1179419A (en) 1966-10-14 1970-01-28 Int Computers Ltd Flying Hammer Solenoid Systems for High Speed Printers
DE1761651A1 (de) * 1968-06-20 1971-07-29 Siemens Ag Vorrichtung zum schlagartigen Anhalten von schnellbewegten Massen
US3678847A (en) 1970-06-25 1972-07-25 Potter Instrument Co Inc Hammer firing system for a high speed printer
DE2119415B2 (de) * 1971-04-21 1975-09-25 Nixdorf Computer Ag, 4790 Paderborn Elektromagnetischer Antrieb für die Nadel eines Nadeldruckers
US3675172A (en) * 1971-05-17 1972-07-04 Decision Data Corp Damping apparatus for a linear actuator device
DE2160032C2 (de) * 1971-12-03 1981-12-17 Philips Patentverwaltung Gmbh, 2000 Hamburg Druckhammeranordnung mit Federantrieb
DE2238605B2 (de) 1972-08-05 1975-10-09 Vierling, Oskar, Prof. Dr.Phil.Habil., 8553 Ebermannstadt Dämpfungsanordnung für impulsbetätigte Antriebsmagneten
JPS50113295A (da) * 1974-02-14 1975-09-05
US4062285A (en) * 1975-10-15 1977-12-13 Xerox Corporation Hammer driver controller for impact printers
DE2629127A1 (de) * 1976-06-29 1978-01-12 Siemens Ag Vorrichtung fuer druckhammeranordnungen

Also Published As

Publication number Publication date
DK356780A (da) 1981-02-21
BR8005274A (pt) 1981-03-04
JPS6026716B2 (ja) 1985-06-25
US4329921A (en) 1982-05-18
CS225141B2 (en) 1984-02-13
MX147871A (es) 1983-01-25
DE2933616A1 (de) 1981-03-26
AU520974B2 (en) 1982-03-11
JPS5630879A (en) 1981-03-28
ZA805075B (en) 1981-08-26
EP0024619A1 (de) 1981-03-11
SU919612A3 (ru) 1982-04-07
AR228855A1 (es) 1983-04-29
DE2933616C2 (de) 1982-09-23
AU6155480A (en) 1981-04-09

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