EP0008660A1 - Structure en forme d'un système magnétique symétrique d'arrêt pour un dispositif de déclenchement ayant un élément mobile, p. ex. marteau de frappe - Google Patents

Structure en forme d'un système magnétique symétrique d'arrêt pour un dispositif de déclenchement ayant un élément mobile, p. ex. marteau de frappe Download PDF

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Publication number
EP0008660A1
EP0008660A1 EP79102636A EP79102636A EP0008660A1 EP 0008660 A1 EP0008660 A1 EP 0008660A1 EP 79102636 A EP79102636 A EP 79102636A EP 79102636 A EP79102636 A EP 79102636A EP 0008660 A1 EP0008660 A1 EP 0008660A1
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EP
European Patent Office
Prior art keywords
magnet
magnets
magnetic
movement element
plunger
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
EP79102636A
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German (de)
English (en)
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EP0008660B1 (fr
Inventor
Walter Hans Hehl
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 EP0008660A1 publication Critical patent/EP0008660A1/fr
Application granted granted Critical
Publication of EP0008660B1 publication Critical patent/EP0008660B1/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
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/04—Means for releasing the attractive force

Definitions

  • the invention relates to a method for operating a holding system for triggering devices with a movement element and the formation of such a holding system itself.
  • So-called snap switches are mentioned as an example of a typical mechanically acting holding device, in which 1 a movable contact element is held in a holding position by a spring as long as this element is not deflected over a certain tilting position. After this tilt position has been reached, the actuating member follows a path which is compulsorily prescribed and in which the spring first accelerates it.
  • Spring-driven pressure hammers are known from the field of printer technology (e.g. from German Offenlegungsschrift OS 15 24 330), which are held in their starting position against the force of a spring by a holding magnet. When the pressure hammer is released, this magnet experiences a corresponding excitation, as a result of which its holding force is no longer maintained and the pressure hammer is driven by the prestressed spring.
  • plunger-operated pressure hammers are known in this field (e.g. from US Pat. No. 3,279,362).
  • the moving coil is movably arranged in a magnetic field passing through it.
  • the print hammer is located on the moving coil body. If this plunger coil is electrically excited for a printing process, the plunger coil experiences a force which deflects it in the printing direction.
  • the efficiency of the print hammer during its movement is different. At the beginning it is low because electrical energy is required to build up the magnetic field of the moving coil and to overcome the ohmic resistance of the moving coil. If it were possible to make this efficiency-effective in the initial stage of the printing hammer motion, this would smooth performance faster achievement of the required for printing final speed of the print hammer and thus a higher D or mean a smaller expended current for the immersion coil excitation.
  • the printing hammer should not be set in motion from the start by a conventional moving coil excitation. He should only use this moving coil excitation when the print hammer has already been brought to a corresponding forward speed. This speed could be obtained by z. B. released from a spring-loaded position and is only subjected to the usual moving coil excitation after a certain time.
  • the print hammer can also achieve such a forward speed by using the contact-free holding system according to the invention, excluding undesired abrasion and bouncing processes.
  • Magnetic cutting forces are understood to be those which occur in the direction of movement when magnets which are attracting or repelling one another move past.
  • these RE magnet configurations can form cutting-like arrangements made of hard or soft magnetic material.
  • the cutting edge is understood to be a narrow side of a RE magnetic plate, the size of which depends on the forces to be applied.
  • RE magnets are characterized by large forces with a relatively small magnet size.
  • FIGS. 4A, 4B, 5A and 5B show schematically how magnetic cutting of small cuboid rare earth magnetic plates can be moved past one another.
  • the magnetization vector M occurring in these magnetic platelets is indicated by small arrows.
  • the The vector is understood to point from the south pole S to the north pole N.
  • Fig. 4A is an attractive magnet configuration (the magnetization vectors of both magnets point in the same direction).
  • the magnet 4A1 is arranged to be stationary; the magnet 4A2 should be moved past the magnet 4A1 at a distance g in the direction of the arrow marked W, ie perpendicular to the magnetization direction.
  • the attraction forces that occur in the direction of the magnetization are greatest when the magnet 4A2 is located below the magnet 4A1, as shown in FIG. 4A, but in this position the component of the attraction force in the direction of the movement W is of the value 0,
  • FIG. 4B shows, in analogy to FIG. 4A, a repulsive magnet configuration with transverse magnetization.
  • the magnetization vectors in the magnets 4B1 and 4B2 run in opposite directions, so that when the magnet 4B2 moves past the magnet 4B1 which is arranged in a fixed direction W, repulsive forces become effective.
  • the repulsive forces in the magnetization direction are greatest when both magnets 4B1 and 4B2, as shown in FIG. 4B, are aligned with one another. In this position, however, the component of the repulsive force in direction W is equal to O.
  • FIG. 6 A subsequent theoretical examination (see FIG. 6) for the arrangements according to FIGS. 4A and 4B shows that the attractive (FIG. 4A) or repulsive cutting forces (FIG. 4B) in the direction of movement W were intended to be aligned left and right of the position of the one another Magnets have a maximum.
  • the potential fields for magnetic cutting edges in open configurations are calculated on the basis of the scalar magnetic potential.
  • the magnet is described solely by (fictitious) magnetic surface charges; the forces result from the numerical integration of the product moment x field strength over the magnetic surfaces.
  • FIGS. 4A and 4B there is a potential distribution according to FIG. 6.
  • the ordinate is the absolute amount of the force IFI occurring between the magnetic cutting edges in the direction of the movement perpendicular to the direction of magnetization
  • the abscissa is the position d projected onto the arrow direction W Magnets.
  • the distance g between the magnetic cutting edges occurs in a mutually aligned position as a parameter in this illustration. For a smaller distance g (marked g1 in FIG. 6), larger cutting forces are effective than for a larger distance g2.
  • the function curve according to FIG. 6 is the same for attractive as well as for repulsive magnet configurations with transverse magnetization; only that it is one time attractive and the other time repulsive.
  • V m (x) of a magnetic cutting edge as a function of the lateral movement d can be approximated by the formula express.
  • d means the position of the magnetic cutting edges projected on the direction of movement W, d0 the zero position; a and b are parameters dependent on the magnet geometry and on a minimal gap.
  • FIGS. 5A and 5B show arrangements for representing magnetic cutting forces in the case of magnetization which is parallel and in the same direction or parallel and runs in opposite directions.
  • the magnet 5A1 in FIG. 5A is arranged to be stationary; the Magnot 5A2 is moved past it at a distance g in the direction W.
  • Direction of movement W and the direction of the magnetisie tion (represented by small arrows running from south to north) run parallel in the same direction.
  • the arrangement according to FIG. 5A behaves like a repulsive configuration. This can be explained as follows: We think of the magnetic charges united on the surfaces of the magnets from which the arrows of the direction of magnetization originate or on which they end. The force effects should therefore take place between these surfaces.
  • the arrangement according to FIG. 5B can be interpreted as an attractive configuration within the close range of the magnets.
  • FIG. 6 thus applies not only to the arrangements according to FIGS. 4A and 4B, but also approximately for the close range of the magnet arrangements according to FIGS. 5A and 5B.
  • FIGS. 7A, 7B, 8A and 8B symmetrical double magnetic cutting edges are shown in simplified form.
  • a magnet 7A2 indicated magnetization in the direction of arrow W between the magnets 7A1 and 7A3 moved.
  • the arrangement is to be understood symmetrically, so that the conditions on the cutting edge between the magnets 7A1 and 7A2 should be the same as between the magnets 7A2 and 7A3. Since the illustration shows attractive magnetic cutting forces in the case of transverse magnetization, and it should not be possible for the magnets 7A2 to deflect perpendicularly to its direction of movement W, the arrangement shown in FIG. 7A is quasi stable, taking into account the cutting forces according to FIG. 6 Position on.
  • the magnet 7A2 does not experience any force in the direction W in the position aligned with the magnets 7A1 and 7A3. In this position, the attractive forces between the magnets in the direction of the magnetization are greatest anyway, so that the magnet 7A2 also has its quasi-stable position can only be brought out by using external forces. If it were on the left or right outside of its aligned position, the forces occurring in the W direction would force it back into the aligned position.
  • Fig. 3 B 7 3-4 a further magnet, according to the arrangement of FIG. Added.
  • the magnets 3-1 and 3 -3 which correspond to the magnets 7B1 and 7B3 in FIG. 7B, are arranged in a stationary manner.
  • the magnet 3-2 (which corresponds to the magnet 7B2 in FIG. 7B) is to be moved between them in the direction W.
  • the magnet 3-4 is offset from the direction of movement W in a fixed position relative to the zero position d0. Its direction of magnetization corresponds to that of the movable magnet 3-2.
  • the potential distribution EH which is caused by the magnets 3-1, 3- 2 and 3-3 is conditional, and to add the potential distribution EM, which is caused by the magnet 3-4.
  • the resulting total potential distribution as a function of the distance from the zero position dO corresponds to the curve ES.
  • This curve shows a depression with the lowest point P1 and a threshold with the summit point P2.
  • the forces caused by the total potential according to curve ES in FIG. 9 result from the derivation of this curve.
  • the distribution of forces as a function of the distance is shown in FIG. 11.
  • the point dO denotes the aligned position ( Fig. 3 dashed) of the magnet 3-2 based on the 3-1 and 3-2.
  • This position is identified in the illustration according to FIG. 10 by the point P2.
  • the point corresponding to the lowest point P1 in the representation ES according to FIG. 9 is also identified by P1 in FIG. 10.
  • this point P1 is relatively stable, ie slight displacements of the magnet 3-2 within a range not exceeding P2 require repulsive forces which continuously push the movable magnet 3-2 back into a position corresponding to the point P1.
  • FIG. 3 were in a state immediately to the right of point P2 (FIG.
  • the curve EM is caused by the magnet 3-4.
  • the configuration of the magnets 3-1, 3-2, 3-3 and 3-4 in FIG. 3 is to be selected so that in each case the formation of a depression in the curve ES according to FIG. 9 occurs. Otherwise there would not be a contactless holding position for the magnet 3-2, identified by the point P1.
  • the formation of the depression required for this holding position in the curve ES according to FIG. 9 can, however, also result from the magnet 3-2 receiving a corresponding spring preload.
  • the potential representation for this spring preload in the direction W is essentially the Correspond to the curve EM in Fig. 9.
  • the superimposition of such a spring characteristic with the curve EH from FIG. 9 should lead to a course of the total potential which corresponds to that of the curve ES with a dip.
  • the magnet 3-4 could be omitted. The effect of such an arrangement would be the same as that of the arrangement according to FIG. 3.
  • FIGS. 8A and 8B show symmetrical double magnetic cutting edges for parallel magnetization.
  • the magnet 8A2 is moved in the W direction between the magnets 8A1 and 8A3.
  • the magnetization direction in all magnets is parallel to the direction of movement W; however, the magnetization in the movable magnet 8A2 is opposite to that in the fixed magnet BA1 and 8A2.
  • the arrangement according to FIG. 8A is a tightenable configuration for the close range.
  • the configuration according to FIG. 8B in the close range is repulsive cutting forces.
  • a magnet 8B2 movable in the W direction is moved between two fixed magnets 8B1 and 8B3.
  • the magnetization in all magnets runs in the same direction and parallel to the direction of movement W.
  • FIG. 6 can be used approximately for the close range for the arrangements according to FIGS. 5A and 5B. This also applies to the configurations shown in FIGS. 8A and 8B.
  • FIGS. 9 and 10 also approximately apply to the configuration repelling in the close range according to FIG. 8B.
  • FIG. 2 shows the basic illustration of a magnetic cutting edge holding system consisting of a symmetrical double magnetic cutting edge for cutting forces with parallel magnetization and a magnet which causes a potential sink.
  • the magnets forming the symmetrical double magnetic cutting edges are marked 2-1, 2-2 and 2-3.
  • the two magnetic cutting edges form between magnets 2-1 and 2-2 on the one hand and between magnets 2-2 and 2-3 on the other.
  • the magnetization in these magnets 2-1, 2-2 and 2-3 should run parallel to the direction of movement W of the magnet 2-2.
  • the magnetization in all three magnets 2-1, 2-2 and 2-3 should have the same direction.
  • the mode of operation of the arrangement initially consisting of these three magnets has already been pointed out in connection with FIG. 8B.
  • a magnet configuration according to FIG. 2 is particularly advantageous for the formation of the moving coil pressure hammer drive according to the invention with a magnetic cutting edge holding system.
  • the reasons for this lie in the addition of the repulsive forces during the acceleration phase after overcoming the point P2 ( A d0) (FIG. 10, FIG. 11) in the direction of movement W.
  • the repelling cutting forces which are located between the magnets 2-1 / Form 2-2 and 2-2 / 2-3 with the repulsive forces between magnets 2-4 and 2-2.
  • FIGS. 2 and 3 have this advantage in common.
  • the configuration according to FIG. 2 gives an additional advantage, which lies in the better utilization of the magnetic material: there is a better localized cutting edge effect, since the magnetic pole surfaces of the magnets 2-1 / 2-2 / 2-3 and the interacting magnetic surfaces Magnets 2-4 / 2-2 are larger than in Fig. 3 and are perpendicular to the direction of movement W.
  • FIG. 1 A schematic representation of a moving coil pressure hammer drive according to the invention with a magnetic cutting edge holding system is shown in FIG. 1.
  • a moving coil body moving in direction P.
  • This moving coil body is penetrated by the magnetic field M, which is formed between the magnets 6 and 7.
  • a coil 2 is cast in a spiral shape inside the moving coil body 1.
  • the moving coil body 1 is supported by two leaf springs 3 and 4, which are fastened on a base body 8. These leaf springs allow movement of the moving coil body in the direction P.
  • Other suitable fastening options for the moving coil body on the base body 8 can be provided.
  • the moving coil body 1 carries the pressure hammer 5 on its upper part.
  • the electrical connections of the moving coil 2 can be made via the holding springs 3 and 4.
  • the moving coil experiences electrical excitation, a force is exerted on the moving coil body 1 in the pressure direction P.
  • the moving coil body should not be exposed to such pressure pulse excitation until it has already been brought to a certain forward speed.
  • This forward speed is given to the pressure spool by the fact that it is held by a magnetic cutting system, e.g. 2, is held in a holding position, brought out of this holding position by applying a small force (in direction P), is subsequently accelerated and only then experiences the actual pressure pulse excitation.
  • a magnet 10 is arranged on the narrow back of the moving coil body 1, which corresponds to the magnet 2-2 in FIG. 2.
  • the magnets 9 and 11, which are firmly connected to the base body 8, are provided to form two magnetic cutting edges.
  • magnets 9 and 11 correspond to the magnets 2-3 and 2-1 in FIG. 2.
  • a magnet 12 is provided on the base body 8. This magnet 12 corresponds to in its function to the magnet 2-4 in Fig. 2.
  • M agnethnesraumen of the magnets 9, 10, 11 and 12 may be made to the illustration in Fig. 2 referred to.
  • the mode of operation of this magnetic cutting device is evident from what has been said in connection with FIGS. 2 and 3.
  • the magnet 10 assumes a point P1 (see F ig. 9 and 10) corresponding to a relatively stable position.
  • a low release force - which must be at least so large that it is able to bring the system beyond the position corresponding to point P2 (FIGS.
  • the time course of the moving coil control variable corresponds to the time speed course of the moving moving coil.
  • a relatively small amount of energy has to be used to move the system from its relatively stable position P1 to a position beyond point P2.
  • the one on it following automatically released energy which is effective for the pre-acceleration of the moving coil body 1 in the pressure direction, can be much greater than the triggering energy with a corresponding path length.
  • the force that has to be applied to trigger the magnetic cutting edge holding system beyond point P2 can be incomparably smaller than the force acting automatically in the pressure direction after the release.
  • FIG. 11 schematically shows a symmetrical double magnetic cutting system, the effect of which is similar to the arrangement according to FIG. 2. However, while a total of four individual magnets are still required in the arrangement according to FIG. 2, this number can be minimized according to the arrangement according to FIG. 11.
  • the magnet 11-2 movable in the direction W does not have a rectangular but a triangular cross-section, the fixed magnets 11-1 and 11-3 having an incline which is adapted to this triangular shape.
  • the magnetization of the three magnets 11-1, 11-2 and 11-3 corresponds to the indicated arrow directions.
  • the operation of the arrangement according to FIG. 11 can be explained in such a way that the beveled end faces of the fixed magnets 11-1 and 11-3 with the beveled surface of the movable magnet 11-2 result in a repulsive force interaction (which of the repulsive ones Effect of magnets 2-4 / 2-2 in Fig. 2 corresponds).
  • magnets 11-1 and 11-3 can also be combined into a single magnet with a corresponding wedge-shaped recess for receiving the magnet 11-2-0.
  • FIG. 12 shows a schematic sectional illustration of a magnetic cutting edge holding system for general applications, in which a high action force is achieved using a relatively low release force.
  • the magnets are ring-shaped.
  • the magnetizations in the individual magnets correspond to the indicated arrow directions.
  • the magnetic ring 15 (or 19) is firmly connected to a shaft 13.
  • the shaft 13 is movable in the indicated direction of the arrow relative to the fixed base body 18 surrounding it.
  • a magnetic ring 16 (or 20) is embedded in this base body in such a way that magnetic cutting forces act between it and the magnetic ring 15 (or 19) located on the shaft.
  • a further magnetic ring 17 (or 21) is arranged on a projection of the base body 18 which is annular in the direction of the shaft axis in such a way that it holds the magnetic ring 15 (or 19) connected to the shaft 13 in a relatively stable position.
  • the magnets 15 (or 19) pressed out of its relatively stable holding position until, from a certain point, which corresponds to point P2 in curve 10, a high action force F2 is released, which accelerates the shaft in the direction of arrow F2.
  • the trigger force F1 can be applied by manual or other means.
  • the possible uses of this magnetic cutting edge holding system shown in FIG. 12 are diverse. So it is z. B.
  • FIG. 13 shows a symmetrical double magnetic cutting edge holding system which consists of only a single magnet within a soft iron magnet circuit.
  • the magnet 22 is arranged between two yoke parts 23 made of soft iron.
  • the magnetic circuit closes via the two air gaps 26 and a soft iron core 24 which is arranged between them in the direction of the arrow and which is fastened on a shaft 27. Since only attractive magnetic forces can be realized with soft iron, this configuration corresponds to the arrangement according to FIG. 7A. Because of the high magnetic induction that can be achieved with soft magnetic materials, high holding forces can be achieved with very thin magnetic cutting edges in the arrangement according to FIG. 13. This arrangement requires the presence of a spring acting on the movement element (not shown) in order to form a trigger threshold.
  • the relatively stable holding position is caused against the force of the spring by the attractive magnetic cutting forces (Fig. 14).
  • the Be Movement element 27 are brought into such a position P3, in which the spring force is greater than the attractive cutting forces.
  • the absolute amount of the force F is shown as a function of the distance d (for the attractive configuration according to FIG. 13) (solid curve). An explanation of the formation of this curve can be omitted with reference to FIG. 6.
  • the spring characteristic dashed curve

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Impact Printers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP79102636A 1978-08-29 1979-07-25 Structure en forme d'un système magnétique symétrique d'arrêt pour un dispositif de déclenchement ayant un élément mobile, p. ex. marteau de frappe Expired EP0008660B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2837550 1978-08-29
DE19782837550 DE2837550A1 (de) 1978-08-29 1978-08-29 Haltesystem fuer ausloesevorrichtungen mit einem bewegungselement

Publications (2)

Publication Number Publication Date
EP0008660A1 true EP0008660A1 (fr) 1980-03-19
EP0008660B1 EP0008660B1 (fr) 1983-05-11

Family

ID=6048110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102636A Expired EP0008660B1 (fr) 1978-08-29 1979-07-25 Structure en forme d'un système magnétique symétrique d'arrêt pour un dispositif de déclenchement ayant un élément mobile, p. ex. marteau de frappe

Country Status (6)

Country Link
US (1) US4290356A (fr)
EP (1) EP0008660B1 (fr)
JP (1) JPS5532400A (fr)
CA (1) CA1119119A (fr)
DE (2) DE2837550A1 (fr)
IT (1) IT1164506B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028314A2 (fr) * 1979-11-02 1981-05-13 International Business Machines Corporation Dispositif de déclenchement électromagnétique, en particulier pour l'actionnement de marteaux d'impression
US4619536A (en) * 1982-09-29 1986-10-28 Ricoh Company, Ltd. Printing hammer assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362787A (en) * 1978-12-11 1982-12-07 Dataproducts Corporation Flag strip for use in print hammers
US4502752A (en) * 1982-11-08 1985-03-05 General Scanning, Inc. Resonant actuator for optical scanning
US4496253A (en) * 1983-04-20 1985-01-29 Daisy Systems, Holland B.V. Impact hammer
CA1223837A (fr) * 1983-09-26 1987-07-07 Takeshi Takemoto Organe de frappe pour imprimante electromagnetique
ITMI20120517A1 (it) * 2012-03-29 2013-09-30 Work Italia S R L Dispositivo di messa a terra e in corto circuito per conduttori, in particolare di linee elettriche aeree

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014258A (en) * 1975-08-29 1977-03-29 Wassermann Carl I High speed printing apparatus
FR2367612A1 (fr) * 1976-10-12 1978-05-12 Dataproducts Corp Assemblage d'aimants pour imprimante a percussion

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Publication number Priority date Publication date Assignee Title
NL6401436A (fr) * 1964-02-18 1965-08-19
DE1264120B (de) * 1964-07-25 1968-03-21 Ibm Deutschland Druckhammerwerk und Verfahren zum Justieren seiner Magnetjoche
DE1287833B (fr) * 1965-06-11 1969-01-23
US3273091A (en) * 1965-08-19 1966-09-13 Metrodynamics Corp Hermetically-sealed manually-actuated magnetic snap switch
US3515452A (en) * 1966-06-20 1970-06-02 Ibm Forming a hologram of a subject recorded on an integral photograph with incoherent light
US3671893A (en) * 1970-11-18 1972-06-20 Gen Electric Magnetic latch and switch using cobalt-rare earth permanent magnets
US3815066A (en) * 1972-06-19 1974-06-04 Ibm Magnetic key mechanism or the like
FR2250315A5 (fr) * 1973-11-06 1975-05-30 Honeywell Bull Soc Ind
US4054944A (en) * 1975-01-17 1977-10-18 Redactron Corporation Finger operated switching device
NL177294C (nl) * 1977-11-03 1985-09-02 Philips Nv Drukker, voorzien van een slaginrichting met opnemer.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014258A (en) * 1975-08-29 1977-03-29 Wassermann Carl I High speed printing apparatus
FR2367612A1 (fr) * 1976-10-12 1978-05-12 Dataproducts Corp Assemblage d'aimants pour imprimante a percussion

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028314A2 (fr) * 1979-11-02 1981-05-13 International Business Machines Corporation Dispositif de déclenchement électromagnétique, en particulier pour l'actionnement de marteaux d'impression
EP0028314B1 (fr) * 1979-11-02 1985-02-13 International Business Machines Corporation Dispositif de déclenchement électromagnétique, en particulier pour l'actionnement de marteaux d'impression
US4619536A (en) * 1982-09-29 1986-10-28 Ricoh Company, Ltd. Printing hammer assembly

Also Published As

Publication number Publication date
DE2837550A1 (de) 1980-03-20
IT1164506B (it) 1987-04-15
DE2965367D1 (en) 1983-06-16
EP0008660B1 (fr) 1983-05-11
CA1119119A (fr) 1982-03-02
US4290356A (en) 1981-09-22
JPS5532400A (en) 1980-03-07
IT7925297A0 (it) 1979-08-28
JPS611311B2 (fr) 1986-01-16

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