EP0063233B1 - Elektromagnetischer Stösselantrieb - Google Patents

Elektromagnetischer Stösselantrieb Download PDF

Info

Publication number
EP0063233B1
EP0063233B1 EP82101865A EP82101865A EP0063233B1 EP 0063233 B1 EP0063233 B1 EP 0063233B1 EP 82101865 A EP82101865 A EP 82101865A EP 82101865 A EP82101865 A EP 82101865A EP 0063233 B1 EP0063233 B1 EP 0063233B1
Authority
EP
European Patent Office
Prior art keywords
electromagnet
armature bars
ram
operating
operating gaps
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
EP82101865A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0063233A2 (de
EP0063233A3 (en
Inventor
Armin Dipl.-Phys. Bohg
Kurt Hartmann
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
Publication of EP0063233A2 publication Critical patent/EP0063233A2/de
Publication of EP0063233A3 publication Critical patent/EP0063233A3/de
Application granted granted Critical
Publication of EP0063233B1 publication Critical patent/EP0063233B1/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
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/133—Construction of hammer body or tip
    • 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 an electromagnetic tappet drive, in which the electromagnet consists of two symmetrically constructed magnetizable yoke halves, each of which is comprised of a coil, the mutually facing pole ends of which form mutually aligned working gaps which extend in mutually parallel directions which are perpendicular to the direction of movement of one Tongue-shaped plunger which is arranged displaceably in the working gaps and which has armature webs made of magnetizable material, each of which is assigned to a working gap, the volume of the armature webs being of the order of magnitude of the working gap volume and the armature webs in the initial position of the plunger in the non-excited state of the electromagnet whose working gaps are located and are pulled into the working gap when the electromagnet is excited.
  • these pressure tappet units consist of a flat frame 2-1-1 between whose legs a tongue-shaped tappet 5 runs in a recess (see FIGS. 1 and 2 of this application).
  • a push button 5-1 is attached at the action end of this plunger 5.
  • the pressure tappet 5 can move in the pressure direction D marked by the arrow (or opposite thereto). Its lateral movement is prevented by the electromagnetic drive units 2-1-2 and 2-1-3 attached to the frame.
  • These electromagnetic drive units can be attached to the frame by gluing, screwing, riveting or other conventional methods.
  • two holes 6 are made; Likewise, two holes 9 are provided in the rear base part of the U-shaped frame.
  • holes 6 and 9 are used to hang two tension springs 7, which bring the deflected plunger back to its starting position.
  • the starting position is formed by a stop 8.
  • a pin 11, which is designed as an extension of the stop 8, is fastened in the direction of D in the base of the u-shaped frame.
  • the plunger is accelerated in the direction of action D by activating the electromagnetic drive units.
  • the pressure ram is returned to its starting position by the force of the springs 7.
  • the disadvantages of the electromagnets are based on the following:
  • the U-shaped or the yokes connected in series to form combs carry the windings on their base part.
  • Comb-like magnetic yoke arrangements are known from German patent application P 3 018 407.7, as explained in more detail in connection with FIG. 7 of this application.
  • This fact has a particularly disadvantageous effect for the desired high division density of such tappet units in a bank.
  • the application of the coils to the magnetic yokes is cumbersome and expensive, and the coil parts on the outside lead to an undesirable magnetic interaction with the neighboring units.
  • the soft iron web structure in the tongue-shaped tappet specified in the exemplary embodiment according to P 2 926 276.8 also has a number of disadvantages. These disadvantages lie in the difficulty of simply inserting such individual soft iron webs into the tongue-shaped pressure ram body, which is otherwise made of plastic, while observing all the required tolerances.
  • the improvements are said to lie in the spatial design of the electromagnet units and in the web structures to be inserted in the tongue-shaped pressure tappet body, and in a reduced interaction of neighboring electromagnet units.
  • FIG. 3 shows a schematic perspective illustration of an electromagnetic pressure tappet drive according to German patent application P 2 926 276.8.
  • a tongue 28 movable in the direction of arrow D is arranged between two fixed stator halves 25, 22.
  • the stator halves 25 and 22 each consist of a magnetizable yoke 27 and 24, which is encompassed by coil turns 26 and 23, respectively.
  • the stator yokes can e.g. B. be semicircular, semi-elliptical or U-shaped.
  • the stator yokes 27, 24 in the two stator halves 25 and 22 are aligned such that the respectively opposite yoke ends are aligned.
  • the magnetic flux runs from one yoke over a working gap to the yoke of the other half of the stator and from there via another working gap back to the first-mentioned yoke, so that the magnetic circuit consists of the two stator yokes and the one between the ends of the Stator yokes are two working columns.
  • stator pair instead of a stator half pair in the opposing stator halves.
  • the current flow in the excitation coils 26 and 23 takes place in such a way that the current direction in the windings within the two opposing stator yokes is the same and opposite to that in the windings outside the stator yokes.
  • the windings are indicated schematically by a few wire loops in the front part of the illustration, while a corresponding sectional illustration of the wires was selected in the rear part.
  • the tongue 28, which is arranged movably in the direction of arrow D between the stator halves 25 and 22, is expanded in the direction of the working gap to be much smaller than in its other two dimensions.
  • the body of the tongue 28 consists of a light, magnetically non-conductive material 29 and magnetically conductive, so-called anchor webs 30 and 21.
  • anchor webs are arranged in the tongue 28 in such a way that when the stator halves are excited from a rest-starting position the space formed between the stator yokes is drawn in and thereby accelerated. The tongue can then follow a further movement in the direction of arrow D.
  • the design of the anchor webs 30 and 21 is essentially chosen so that their volume would approximately fill the space circumscribed between the ends of the stator yokes.
  • the distance covered by the tongue from the initial position to the position after the acceleration phase has ended is referred to as the acceleration stroke; the sum of the acceleration stroke and the subsequent further deflection of the tongue in the direction of arrow D as the working stroke.
  • This size depends on the structural boundary conditions and on the means provided for storing the tongue or for returning the tongue to its initial position.
  • Known return springs can be used as such means: e.g. two leaf springs, as described in DAS 1237816: a spring in cooperation with a slide bearing of the tongue or a return spring in cooperation with a tongue which can be pivoted about an axis.
  • Electromagnetic feedback is also possible.
  • the coil turns run around the base of the U-shaped yoke halves.
  • the turns are arranged inside and outside the pair of yokes.
  • the effort to attach such windings and the associated space requirements are relatively high.
  • the subject matter of the present application therefore makes use in particular of an inventive design of the yoke halves in connection with the attachment of the windings.
  • electromagnet with a working gap described in German Patent Application P 3 018 407.7 (GE 980 014), into which an element containing a displaceable soft magnetic material is drawn when the electromagnet is excited, is characterized in that the electromagnet (95) consists of two magnetizable yoke halves (96 , 97, 99; 108, 109, 98), of which at least one is enclosed by a coil (100), that the mutually facing, substantially semicircular, recessed pole ends of the yoke halves form essentially circular working gaps (101, 102), that between the pole ends of the yoke halves there is arranged a plunger (91) which can be displaced in the direction of the line of alignment of the working gap and which has a cross section adapted to the surface of the working gap, that the plunger (91) has two armature disks (92, 93) made of magnetizable material and one between them anchor disks (92, 93) arranged spacer element (94) made of predominantly non-magnet
  • FIG. 1 shows a perspective view of a bench for receiving a plurality of pressure ram units.
  • the pressure ram units of which only four (for the sake of simplicity) (without the pressure ram) are shown with 2-1, 2-2, 2-3 and 2-4.
  • the frames of these pressure ram units bear the reference numbers 2-1-1, 2-2-1, 2-3-1 and 2-4-1.
  • Each pressure tappet unit has a pair of electromagnetic drive units for the pressure tappet.
  • the electromagnetic drive units for the pressure ram unit 2-1 are designated 2-1-2 and 2-1-3 and are arranged on both sides of the frame 2-1-1 in an aligned manner.
  • Electromagnetic drive units as can be used for the bank described here, are described in the German patent application P 2 926 276.8.
  • the print hammer bank consists of a lower part 1-1 and an upper comb-like part 1-2.
  • the lower part 1-1 is referred to as the base part and the upper part 1-2 as the comb part.
  • the base part is composed of two rails 1-1-1, 1-1-2 running parallel to one another and a part 1-1-3 provided with slots 4 between them. The slots run parallel to each other and are limited in length by the rails 1-1-1 and 1-1-2. They serve to accommodate a lower extension (see FIGS. 2 and 4) of the pressure ram frame.
  • the comb part 1-2 of the bench consists of a beveled (1-2-1) part which has comb-like incisions 3 on its side tapered by the bevel. These comb-like incisions 3 are aligned with the slots 4 in the base part 1-1. Each of these comb-like incisions 3 comprises part of the upper edge of the frame of the individual ram units. The individual ram units are thus fixed in their position.
  • an electromagnetic drive unit 2-1-2 and 2-1-3 is arranged in a mutually aligned form.
  • the electromagnetic drive units are offset in pairs for pressure ram units lying next to one another, so that the distance between two frames lying next to one another is determined by the strength of an electromagnetic working unit.
  • the electromagnetic drive units 2-1-2 / 2-1-3 of the pressure plunger units 2-1 are compared to the electromagnetic drive units 2-2-2 / 2-2-3 of the pressure plunger unit 2 -2 offset accordingly.
  • FIG. 1 and FIG. 2 come from European patent application 82 101 861.1 (EP-A-0 062 765), which was filed on the same day as the present patent application.
  • FIG. 4 shows an exploded view of a pressure ram unit with associated electromagnetic drive units. Many parts of FIG. 4 correspond to the parts with the same reference numerals in FIGS. 1 and 2. In order to avoid repetitions, they are not dealt with in the explanation of FIG. 4, or only briefly.
  • the soft iron bars required for the effectiveness of the electromagnetic drive are shown at 60, 61 and 62.
  • the magnet yoke combinations are 40 and 50 marked. Each of these combinations is accommodated by a housing 140, 150 with a corresponding plug connection 141, 151 with the contacts 142, 152 for the excitation coils 45 and 55.
  • These housings are connected to the frame by means of screws (not shown) or other suitable fastening means.
  • Corresponding mounting holes are designated in the housing 150 with 32-1 and 33-1 and in the frame 2-1 with 32 and 33.
  • the fastening elements which are not shown for reasons of clarity, ensure exact positioning of the electromagnetic drive units, in particular the working gaps in relation to the soft iron webs 60, 61, 62 in the tongue-shaped plunger 5.
  • a magnetizable web must be provided stand in front of a working gap when the electromagnets are not excited.
  • the magnet yokes 41 and 51 have an E-shaped cross section.
  • the opposite E-shaped magnet yokes 51 and 41 are aligned so that a total of 3 working gaps are formed by their leg ends 52, 53, 54 and 42, 43, 44: the first working gap lies between the leg ends 52 and 42, the second between the Leg ends 53 and 43 and the third between the leg ends 54 and 44.
  • One of the three magnetizable webs 62, 61 and 60 is assigned to each of these working gaps.
  • the excitation winding for each magnetic yoke runs, as shown in FIG. 4, around the middle E-leg in such a way that the excitation coil can be manufactured separately as a flat slip-on coil for the middle E-leg, with the winding strands running parallel in the through the Legs formed spaces must fit.
  • the magnetic yoke excitation coils is extremely inexpensive and space-saving.
  • the coil expansion does not extend in the direction perpendicular to the plunger plane beyond the magnetic yoke. This fact is particularly noteworthy for a high packing density with little magnetic interaction of the pressure ram units in banks.
  • the flat coil and the E-shaped magnetic yoke allow simple and inexpensive production of the individual parts and easy assembly of the two parts.
  • the magnetic yoke coil combination 50 is inserted into a corresponding recess 34 in the housing 150 and is potted there with the housing with plastic. The same applies to the magnetic yoke coil combination 40 and the housing 140.
  • the soft iron webs in the pressure ram 5 should be assigned to the corresponding working gaps of the electromagnets with as little tolerance as possible. This also results in requirements for the problem-free insertion of the magnetizable webs into the plastic base body of the plunger 5.
  • FIG. 5 shows a structure in which the magnetizable webs 60, 61 and 62 are continuously connected with the same magnetizable material of thinner thickness.
  • the webs 60 and 61 are connected via the connection 63 and the webs 61 and 62 via the connection 64.
  • Such connections 63, 64 between the webs are undesirable for optimal operation of the drive. It has been found, however, that with a correspondingly thin thickness of these compounds, their disadvantageous influence on the efficiency is only slight and that this influence can, in practical terms, be readily accepted.
  • This makes it possible to produce the web structure as a coherent part and to simply embed this part in the tongue-shaped plunger 5. Here you only have to take into account the correct fitting of this one part into the plunger 5 (and not the three individual bars). After inserting this part into a corresponding recess in the plunger, it is cast with plastic, and the previously empty recesses (64, 65) of the part are also filled with plastic up to the plunger level.
  • FIG. 6 Another web structure is shown in FIG. 6.
  • the plunger itself is labeled 70, the plunger head again 5-1.
  • the holes for receiving the tension springs (not shown) (see FIG. 4) have the reference number 6 and those material-saving bores have the reference number 31 as in FIG. 4.
  • the web structure 71 itself has the shape of a longitudinally and transversely divided rectangular frame with four openings 72.
  • the frame parts essential for the tappet drive are the webs 73, 74 and 75.
  • the webs 73 and 74 are due to the frame parts 76, 77 and 78 lying transversely thereto made of the same material as the web material;
  • the webs 74 and 75 are connected by the frame parts (same material) 79, 80 and 81 lying transversely thereto.
  • the transverse frame parts are narrower and thinner than the webs themselves - the frame openings are potted with plastic up to the ram level.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP82101865A 1981-04-11 1982-03-09 Elektromagnetischer Stösselantrieb Expired EP0063233B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3114834 1981-04-11
DE19813114834 DE3114834A1 (de) 1981-04-11 1981-04-11 Elektromagnetischer stoesselantrieb

Publications (3)

Publication Number Publication Date
EP0063233A2 EP0063233A2 (de) 1982-10-27
EP0063233A3 EP0063233A3 (en) 1983-09-14
EP0063233B1 true EP0063233B1 (de) 1986-06-04

Family

ID=6130023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101865A Expired EP0063233B1 (de) 1981-04-11 1982-03-09 Elektromagnetischer Stösselantrieb

Country Status (4)

Country Link
US (1) US4412197A (enrdf_load_stackoverflow)
EP (1) EP0063233B1 (enrdf_load_stackoverflow)
JP (1) JPS57170061A (enrdf_load_stackoverflow)
DE (2) DE3114834A1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108159A1 (de) * 1982-11-05 1984-05-16 Ibm Deutschland Gmbh Elektromagnetischer Drehantrieb mit Nickbewegung, insbesondere für Anschlagdrucker
US4496253A (en) * 1983-04-20 1985-01-29 Daisy Systems, Holland B.V. Impact hammer
EP0127692B1 (de) * 1983-06-01 1988-06-01 Ibm Deutschland Gmbh Elektromagnetischer Stösselantrieb
EP0134827A1 (de) * 1983-09-08 1985-03-27 Ibm Deutschland Gmbh Elektromagnetischer Antrieb für fortlaufende und schrittweise Linear- oder Drehbewegungen
DE3465931D1 (en) * 1984-10-04 1987-10-15 Ibm Deutschland Electromagnetic drive, in particular for an impact printer
US4867059A (en) * 1988-08-05 1989-09-19 International Business Machines Corporation Impact printer print mechanism and method of manufacture
DE3931050A1 (de) * 1989-09-16 1991-03-28 Bosch Gmbh Robert Pruefeinrichtung fuer beschleunigungssensoren
US20080061105A1 (en) * 2005-06-17 2008-03-13 Jonas Zachrisson Electrically Powered Tool

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1110729B (de) * 1956-02-23 1961-07-13 Licentia Gmbh Schaltmagnet fuer elektromagnetische Schaltgeraete, z. B. Schaltschuetze
US2935663A (en) * 1958-04-04 1960-05-03 Manfred J Pollak Magnetic actuators
DE1236072B (de) * 1960-08-25 1967-03-09 Licentia Gmbh Elektromagnet mit M-foermigen Jochhaelften und auf Parallelitaet justierbaren Polflaechen
DE1237816B (de) * 1963-08-24 1967-03-30 Ibm Deutschland Druckhammerantrieb fuer Schnelldrucker
US3491319A (en) * 1967-08-29 1970-01-20 Servo Labs Inc Digital actuator
JPS5180205A (enrdf_load_stackoverflow) * 1975-01-08 1976-07-13 Hitachi Ltd
JPS53113376A (en) * 1977-03-15 1978-10-03 Matsushita Electric Works Ltd Oscillatory device
JPS5473917U (enrdf_load_stackoverflow) * 1977-11-04 1979-05-25
DE3065513D1 (en) * 1979-06-29 1983-12-15 Ibm Electromagnetic device for driving a print element

Also Published As

Publication number Publication date
JPS57170061A (en) 1982-10-20
DE3114834A1 (de) 1982-11-04
JPS6226262B2 (enrdf_load_stackoverflow) 1987-06-08
EP0063233A2 (de) 1982-10-27
DE3271507D1 (en) 1986-07-10
EP0063233A3 (en) 1983-09-14
US4412197A (en) 1983-10-25

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