US3359921A - Print hammer unit for high speed printers - Google Patents

Print hammer unit for high speed printers Download PDF

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Publication number
US3359921A
US3359921A US473093A US47309365A US3359921A US 3359921 A US3359921 A US 3359921A US 473093 A US473093 A US 473093A US 47309365 A US47309365 A US 47309365A US 3359921 A US3359921 A US 3359921A
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United States
Prior art keywords
print
hammer
hammers
print hammer
magnet
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Expired - Lifetime
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US473093A
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English (en)
Inventor
Arnold Sieghard
Buhrmann Gerold
Haasis Jurgen
Heinrich Horst
Nitschke Manfred
Schacht Gunter
Spieth Eberhard
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International Business Machines Corp
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International Business Machines Corp
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    • 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
    • B41J9/36—Means for operating hammers to effect impression in which mechanical power is applied under electromagnetic control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • FIG.7
  • This invention relates to a print hammer unit, and in particular to a print hammer unit for a high speed printer which is used as an output device for an electronic data processing machine.
  • a type carrier which contains several sets of all characters to be printed, and which carries out a periodic movement so that each printable character is oiered to each print position of a print line.
  • a rotating type drum, a type chain moving in the print line direction or a type bar moving back and forth periodically in the print line direction can be used as a type carrier.
  • a print hammer is provided which is released at a suitable moment, i.e., ywhen the type to be printed is in the corresponding print position.
  • an electronic representation is formed of the print type which is in an individual print positions each time, with reference to a certain position of the type carrier.
  • a particularly difficult problem connected with such high speed printers occurs in the print hammer mechanism.
  • the print hammers should have a considerable but clearly defined amount of kinetic energy in order to obtain a uniform print on several copies, and the hammer motion, with the hammer ilight time of some milliseconds duration, has to be exactly reproducible.
  • the contact of the print hammer with the type flying by must be of very short duration.
  • a well known print hammer mechanism for such high lCC speed printers works in such a manner that the armature and electromagnet accelerate the print hammer. As the magnet only fires the print hammer, which then moves on in free flight, a great number of factors have to be taken into consideration with regard to the hammer motion, and an exactly reproducible hammer motion can be obtained only with great diiculty.
  • This print hammer mechanism has as lone of its disadvantages the fact that the support of the print ham-mer on an axle requires an uncomfortably large Width for the hammer drives. Through this support, friction losses are caused, which consume part of the hammer energy. Besides it is quite diflicult to adjust all print hammers in such a manner that they t against the various magnets without air gaps, which is a condition absolutely necessary for obtaining an accurately defined hammer motion. Fnally, the magnet windings have to be housed in a very narrow 4winding space. This limits the power of the holding magnets, which in turn puts a limit on the strength of the driving spring. Furthermore, this print hammer unit is complicated in its construction and requires a large amount of maintenance.
  • This invention relates to a print hammer unit where potential energy which has been stored in a spring is used for print hammer actuation, and where the print hammer release is effected through deactivation of the magnet holding the tensioned print hammer.
  • the print hammer unit of the present invention is of such a design that potential energy is stored in elastic elements, preferably flat springs, which are relatively rigid to tensile and torsional stress, and are subjected to bending only, and which at the same time provide supports for the print hammer, and are arranged in such a manner that the print hammer motion consists of a parallel movement.
  • a printing unit as disclosed by this invention is advantageously constructed in such a manner that the print hammers are formed as flat rods having a bent portion serving as an armature.
  • Said rods form components of an operational atness which can be replaced individually, along with their supports which consist of two fiat springs arranged vertically and fixed in a foot plate.
  • the tensioned print hammers associated with the individual print positions are held by means of electromagnets consisting of a magnet yoke arranged at each print position and a magnet winding common to all the magnet yokes, and that for the deactivation of the electromagnets holding the tensioned print hammers, release windings are arranged at the individual print positions on the magnet yokes in such a manner that the magnetic field each produces compensates or neutralizes the field of the holding magnet, or removes it from the armature, respectively.
  • the print hammer unit as disclosed by the invention is of such a design that the magnetic field of the holding magnet is overcompensated for, through the magnetic field of the releasing magnet at the print position in question.
  • the present invention provides for the holding winding, which is continuously energized and which is common to all magnet yokes, to be connected in series with an inductance of a high v-alue in order to avoid the iniiuences of changes of the magnetizing force at the individual magnet yokes on the holding liux.
  • the magnet yokes near their pole faces have a cross section which is reduced in comparison with the cross section of the remainder of the magnetic circuit, so that in that area they are magnetized to the saturation point.
  • An important advantage of the print hammer unit as disclosed in the present invention is that the magnet yokes, preferably in pairs, are secured by means of tensioned clamps to bars mounted on a support. It has been found to be desirable to have impressed in the faces of the bar surfaces and the inner jaws of the tensioned clamps pressing the magnet yokes against the bars, respectively, hard crystals such as sintered A1203 (corundu-m). This has the effect that the magnet yokes are so aligned individually against their print hammers that upon excitation of the mold magnets, and when their respective clamps have been released -by a key, they locate themselves against the corresponding magnet armature without an air gap being formed. It is thus possible to adjust all magnet yokes within the shortest time through a simple manipulation without the risk of twisting or overtensioning of the support holding the magnet yokes.
  • the print hammer unit disclosed by the invention is of such structure that the magnet yoke support is equally supported on leaf springs which are arranged in such a manner that it can be shifted with a parallel motion, and then it carries out a movement of going periodically back and forth and being directed in a vertical direction rela-l tive to the platen which serves for the return of the fired print hammers.
  • Such movement is preferably effected by means of a cam gear.
  • An uncomplicated and safe method of securing and adjusting the individual print hammer units is obtained in the printing device as disclosed yby the invention, by securing the print hammer units, preferably in pairs, by means of foot plates to stationary guiding plates so that the print hammer units can be shifted or adjusted individually.
  • the leaf spring structures are designed in such a manner that the springs carrying the print hammers are surrounded at their tops and bottoms with coatings of an elastic substance which fills cavities in the print hammers and the foot plates in which the spring ends are welded, said coatings being tapered towards the middle of the springs.
  • Another advantage of the print hammer unit as disclosed by this invention is that spring U-bolts are provided which slide in the direction of the leaf springs carrying the print hammers, and which furthermore t against the leaf springs at their ends, and which are combined structurally to be slidably supported in the foot plate of the corresponding print hammer unit. These U-bolts serve for adjusting the hammer flight time. rIhrough a small shifting of these U-bolts the manufacturing tolerances in the thickness of the leaf springs carrying the print hammers can be compensated for.
  • the print hammer unit of this invention is characterized in that at the individual print positions elastically fixed damping material is provided which absorbs the energy of the print hammers moving back after the print impact, and which by means of elastic stops, locks the print hammers until the magnet yokes, when moved to their extreme forward positions, have magnetically attracted their respective hammers.
  • the damping material is arranged on a support extending over all of the print positions, which support is pivotally mounted and offset from the elastic stops in a downward direction, by means of an axle. This support is pivotally movable for a short time to release the print hammers, preferably by means of a cam gear.
  • FIG. l is a partly broken away perspective drawing of a print hammer unit embodying the invention in one of its forms;
  • FIG. 2 is a schematic partly sectional view of the drive of a print hammer unit in side elevation and in the rest position;
  • FIG. 3 is the same view as shown in FIG. 2 but at the beginning of the restore motion of the print hammer;
  • FIG. 4 is the same view as shown in FIG. 2 but with the print hammer springs tensioned;
  • FIG. 5 is the same view as shown in FIG. 2 in an intermediate position shortly after a print hammer impact;
  • FIG. 6 is an enlarged view of the holding magnets and their support means
  • FIG. 7 is a plan view of the holding magnets with their supporting clamps
  • FIGS. 8a and 8b are top and side views respectively of the key used for adjusting the holding magnets and opening the support clamps;
  • FIG. 9 is an enlarged perspective view of the dampers at the moment of becoming effective upon the restore of the print hammers
  • FIG. l0 is an enlarged side view of a print hammer and its support
  • FIG. 11 is a sectional view along the line 11-11 of FIG. 10 showing more clearly the securing of the leaf springs at their clamping points;
  • FIG. 12a.' is a schematic diagram of the circuits for the holding magnets together with the bucking windings therefor;
  • FIGS. 12b and 12C show curves illustrating the hammer flight time v. bucking ampere turns and voltage, respectively.
  • a type bar 1 is used as a type carrier which can be shifted longitudinally in a print line direction and which is designed in a comblike form.
  • the type bar 1 is secured to a tube 2 which moves in a guide 3.
  • the type bar 1 is equipped with elastic tongues 4 to whose free end the print types 5 are fixed.
  • the spacing of the individual tongues corresponds with the spacing of the print positions of the print line.
  • the print types 5 are moved against a paper sheet 7 placed over a platen 6. Ribbon 8 is guided over the paper sheet 7.
  • a print hammer 11 is provided which at a suitable moment, i.e., when through shifting of the type bar 1, the type to be printed is in the corresponding print position, strikes against the head of the elastic tongue 4 and thus elfects the printing of the corresponding type.
  • the print hammers 11 are secured at the heads of two leaf springs 12, 13 which in turn are clamped at their foot end in a foot plate 14.
  • the hardness of the leaf springs 12, 13 is selected in such a manner that the springs are to be regarded as rigid with respect to pressure, tension, and torsion. They are only exposed to a bending action.
  • the movement of the print hammer secured to said springs principally consists of a parallel motion.
  • the print hammers which may be considered as formed of little rods consisting of one piece, and are normally held in a tensioned state through a holding magnet.
  • a holding magnet For that purpose they are L-shaped and have a bent projection 15 which serves as a magnetic armature (FIG. 6).
  • armature 15 With each armature 15 a magnet yoke 16 is associated which is H-shaped. Pole faces 17, 18 lie at the ends of the free legs 19, 20 of the yoke 16 opposite the armature 15.
  • a magnet winding 21 extends over all the magnet yokes 16 and is housed in the cavity in the legs 19, 20 and continuously carries current during operation, so that the holding magnets for the individual print hammers are continuously excited.
  • the magnet yokes 16 have ledges 22, 23 near the pole faces at which the cross section -of the yokes is reduced. It thereby results that the magnet yoke 16 within the area of their pole faces 17, 18 are magnetized to the saturation point, and thus the holding force of the holding magnets is independent of voltage variations.
  • the holding winding 21 is connected in series with an inductance device L of a relatively high value (FIG. 12a) in order to avoid the effects of variations in the magnetizing force of the holding circuit during the firing of the print hammers.
  • windings 24, 25 are arranged -on the free legs 19, 20 lof the magnet yokes 16, the magnetic field of which is formed upon applying an electric pulse, being in an opposite direction to the lield of the hold magnet at the respective print position.
  • the windings 24, 25 are of low inductance and the ampere turn value is regulated in such a manner that the magnetic eld of the holding magnet is not only neutralized or compensated for through the release of bucking windings 24, 25 but is overcompensated for.
  • the compensating windings 24, 25 are arranged by means of the insulation support sleeves 26, 27 on the legs 19, 20 of the magnet yokes 16, without the use of the usual spools. They are connected in series and have their connections made t an insulating plate 30 mounted Ion the magnet yoke through rivets 28, 29, and upon which plate they are soldered to a printed circuit 31. The lines of the printed circuit are in turn connected to exible leads 32, 33 which are secured to the insulation plate 30 by means of a clamp 34.
  • the magnet yokes 16 are H- shaped.
  • a support bar 37 vertical bridges 38 are mounted with regular spacing, against whose both flanks two respective magnet yokes 16 are located by means of their legs 35, 36.
  • the magnet yoke legs are pressed against the bridges 38 by means of two tensioned and elastic U-clamps 39.
  • a spring sleeve projecting from a hole 40 drilled through the support 37 serves as a stop for the tensioned clamps 39.
  • Support 37 has also holes 41 which serve for receiving a key 42, the shaft of which has an oval cross section (FIG. 8).
  • hard A1203 crystals 44 are impregnated in the contact faces of the bridges 38, the points of which are protruding from the surface embed themselves in the softer metal of the magnet yokes and thus prevent any sliding of the adjusted magnet yokes.
  • a restore bail 45 is provided to which is connected the support 37 and which is supported on leaf springs 49, 50 so as to be movable to bring the magnets 16 into juxtaposition with their respective armatures 15. Movement of the restore bail 45 and consequently also of the magnet yokes 16 is effected through a drive which in FIGS. 2-5 is shown in various positions.
  • the restore bail 45 has a ledge 52. In the cavity formed thereby a roller lever 53 protrudes from below. On this lever roller 55 is supported by means of axle 54, said roller engaging with the restore bail at the contact line 56.
  • the restore bail is in turn pressed against the roller 55 by a helical spring 57 which is supported by a stationary machine part 58.
  • Roller lever 53 is supported on an axle 59. On its other lever arm it carries a roller 60 which engages with a cam disc 62 mounted on axle 61.
  • dampers 63 For receiving the motion energy of the print hammers moving back after a print impact dampers 63 are provided for the individual print hammers, the damper mass of which corresponds approximately to the mass of the print hammer (FIG. 9).
  • the damper material 63 which iS secured to block 65 through the layer of rubber 64, engages with the print hammers by means of locking levers 66 and consists of elastic material such as a nylon composition, said levers being secured thereto at the lower edge.
  • the print hammers have upwardly projecting stops 67 which push against the front side of the locking levers 66 during backward motion.
  • the dampers are mounted pivotally, the locking levers 66 being pivoted out of the path of the print hammer.
  • the damper block 65 is for that purpose connected to a rail 70 by means of screws 68, 69, said rail being in turn secured to an arm of a pivoted lever 71.
  • the lever 71 is mounted on axle 72 (FIGS. 2 5). This axle is arranged in an offset or staggered position in a downward direction from the supporting point of locking lever 66, so that upon upward motion of the locking lever there is little or no interference between the print hammer and the locking lever.
  • a roller 73 is supported for engaging with a cam disc 74 which is also mounted on axle 61. Roller 73 is engaged with the disc 74 by means of springs 75.
  • the operation motion is as follows. In the rest position the leaf springs 12, 13 are not tensioned and are in a relatively ilat position.
  • the restore bail 45 is moved far enough to the front (to the right in FIGS. 2-5) that the magnet yokes 16 secured to it touch the armatures 15. If the holding winding 21 on the magnet yoke 16 is energized, the armatures 15 are held magnetically at the pole shoes of the magnet yokes. If now the shaft 61 starts its turning motion, lever 71 is pivoted by means of the cam disc 74 so that the locking lever 66 is lifted upwardly out of the print hammer path. Under the influence of the cam disc 62 the restore bail 45 and support 37 are then moved back to the left.
  • the print hammers are carried along in the process and the springs 12, 13 are thus tensioned.
  • the damper mass 63 returns to its original position in the meantime.
  • the locking levers 66 are now located with a light spring tension against the sloping faces of the print hammer stops I67. If now a print hammer is released from the magnet yokes 1-6 by one of the compensating windings 24, receiving a pulse of electrical energy, it jerks forward, strikes the print type ag-ainst the paper sheet and is stopped in its return motion by the damper locking lever 66.
  • the locking lever -66 is equipped with a weight 77 so as to make sure that upon the effecting of a print impact, the damper is already returned to the locking position. After all of the print hammers have been released for the line to be printed, the restore bail is moved forward again by the cam disc ⁇ 62, so that the released print hammers may be secured by their respective magnet yokes.
  • each print hammer forms a structural unit with its mounting and if necessary it can be removed and exchanged very easily.
  • Two associated foot plates 14 are connected with each other by means of screws 78, 7 9, and 80 as shown in FIG. l, the guide plate ⁇ 81 being interposed therebetween.
  • the guide plate 81 is located with its stop faces 82, 83, and 84 against the block 85 and the cover plate 86, and on the other side it is inserted in slots yS7 of a plate 88. It is secured to the block -85 by means of screw 89 and lock nut 90.
  • the holes in the foot plate 14 and the guide plate S1 for the screws '78, 79, and S0 are sufficiently large to provide clearance for the screws so that the print hammer units can be adjusted individually.
  • the securing of the leaf springs 12, 13 is effected at the top as well as at the lower end in an elastic junction (FIGS. l0, 11).
  • the slots receiving the ends of the leaf springs are of increased width in the upper portion. Besides that, they are enlarged towards their outer edges so as to form a cone-shaped funnel 93, 94.
  • the rivet-shaped cavity formed in this manner is filled with an elastic synthetic material 95 such as, for example, a nylon composition.
  • leaf springs shoulders 496, 97 of the print hammers are surrounded by the synthetic material 95 in order to extend the elastic junction over the whole width of the leaf spring, which is wider than the width of the print hammer, the elastic material being tapered in thickness towards the midpoint of the springs.
  • the leaf springs are welded or otherwise suitably secured to the print hammers and the foot plates, respectively.
  • spring U-bolts 102 are provided which are slidably movable along the leaf springs, said U-bolts fitting against the leaf springs at their ends with small rollers 103, 104 of synthetic material.
  • the U-bolts are positioned in grooves provided in opposite faces of, and are locked in the foot plates 14, through the use of elastic locks 105, 106 positioned in the grooves 107, 108 and fitting against the bolts under pressure.
  • These slidable U- bolts have the function of adjusting the action of the springs 12, 13 to compensate for minor manufacturing tolerances in the thickness of the leaf springs, and permit a relatively ltine adjustment of the hammer flight time.
  • the holding winding 21 which is common to all of the magnetic yokes 16 is connected to the positive terminal of a 38 v. ⁇ source and to ground, through an inductance device L and a series resistor R.
  • the bucking or neutralizing windings 24 and 25 of the individual magnet yokes 16 are also connected'to the same source through a resistor R1.
  • the series resistor R1 is bridged by a capacitor C1 in order to effect a quick rise time of the magnetizing current.
  • the holding winding 21 is common to all of the magnet yokes 16 whereas the bucking windings 24 and 25 are individually arranged on each yoke and can be controlled individually.
  • the other end of the series connected windings 24 and 25 is connected to the collector of a transistor TR1 whose emitter is connected to ground or zero potential.
  • transistor TR1 Normally the transistor TR1 is turned oli', but if a pulse is applied to its base by way of the AND switch A1 this transistor is turned on, and the bucking windings 24, 25 are excited for a relatively short time.
  • the transistors TR for each of the print positions are controlled as follows.
  • the memory storage of the machine contains the text of a print line.
  • By -comparison with an electronic image or representation of the characters on the type bar it is determined after each step of the type bar how many further steps of the type bar are required each time in order to make sure that a type character corresponding to the character to be printed in a particular position is located opposite this printing position. If the number of steps required equals zero, that is, if a character to be printed lies opposite the particular printing position in question, the corresponding AND switch A1 is prepared by raising the line x. When this has been carried out for all of the printing positions for a particular position of the type bar, a pulse is applied to raise the line y of all AND switches A.
  • the transistors TR1 are turned on and the corresponding windings 24, 25 are energized, so that the print hammers are released, and a print impact is obtained in all 0f those printing positions where the AND switches A have been prepared by raising the line x.
  • the bucking windings 24 and 25 producing a sufficiently strong magnetic lield, the magnetic field of the holding winding 21 is more than neutralized, and is overcompensated, thereby forcing collapse of the holding magnet iield more rapidly and a reduction of the hammer flight time and a stabilization of the system is obtained.
  • FIG. 12b the hammer flight time dependency on the ratio of the ampere turns of the bucking windings and of the holding winding, is shown.
  • the most favorable value of a is at approximately 1.76; considerable variations in the values can occur, however, without there being any exceptional change in the hammer flight time, because of the flatness of the curve in this area.
  • a print hammer unit for a high speed printer having movable means for presenting a plurality of type characters at a print line for cooperative print action by print hammer means
  • a print hammer having a hammer portion adjacent the print line at each of a plurality of print positions and having an armature portion
  • resilient support means for each of said hammers including a pair of parallel flat spring members
  • means including electromagnetic means having a separate magnetic yoke at each print position with a single hold winding common to all of the yokes operable to produce magnetic iiux in said armature portions to hold said armature portions away from the print line and flex said spring members to store potential energy therein,
  • the combination in accordance with claim 3 characterized in that the holding coil which is common to all magnet yokes and continuously carrying current is connected to a source of electrical energy in series with an inductance device of a high value.
  • the combination in accordance with claim 4 characterized in that the magnet yokes near the pole faces have a cross section which is reduced compared with th eremaining magnetic circuit, and that in this area they ⁇ are magnetized to the saturation point.
  • a print hammer unit the combination in accordance with claim 8, characterized in that carrier of the magnet yokes is supported on leaf spr-ings and arranged in shiftable manner, and that cam means is provided to actuate the carrier and provide a motion which goes back and forth periodically and which is also directed perpendicular to the platen, said motion serving for the restoring of the red print hammers.
  • the print hammer units preferably in pairs, are fixed in such a manner that they can be adjusted individually, as they are secured to their foot plates iby stationary guide plates.
  • the combination in accordance with claim 10 characterized in that the leaf springs carrying the print hammers are surrounded at their top and lower ends with coatings ofelastic material which fill cavities recessed in the print hammers and the foot plates, said cavities having the spring ends welded to their innermost ends, and that these coatings taper continuously towards the middle of the spring.
  • damper masses are Iixed on a common carrier extending over all print positions, pivotally supported with its pivot point positioned below the elastic locks, said carrier being pivoted for movement for a short time for releasing the print hammers, preferably by means of a cam gear.

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US473093A 1964-07-25 1965-07-19 Print hammer unit for high speed printers Expired - Lifetime US3359921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEJ26273A DE1264120B (de) 1964-07-25 1964-07-25 Druckhammerwerk und Verfahren zum Justieren seiner Magnetjoche

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US3359921A true US3359921A (en) 1967-12-26

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US473093A Expired - Lifetime US3359921A (en) 1964-07-25 1965-07-19 Print hammer unit for high speed printers
US72809368 Expired USRE27175E (en) 1964-07-25 1968-04-29 Print hammer unit for high speed printers

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US72809368 Expired USRE27175E (en) 1964-07-25 1968-04-29 Print hammer unit for high speed printers

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US (2) US3359921A (de)
AT (1) AT250714B (de)
BE (1) BE667412A (de)
CH (1) CH433830A (de)
DE (1) DE1264120B (de)
FR (1) FR1453936A (de)
GB (2) GB1079558A (de)
NL (1) NL150054B (de)
SE (1) SE329288B (de)

Cited By (17)

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US3460469A (en) * 1966-12-30 1969-08-12 Ibm Print hammer actuator
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3635156A (en) * 1969-10-06 1972-01-18 Ncr Co Fatigue-resistant attachment for highly stressed members such as print hammers
US3653321A (en) * 1969-12-15 1972-04-04 Ibm Type mounting means for high speed front printer
US3656425A (en) * 1970-03-20 1972-04-18 Information Printing Systems C Electromagnetic actuating means for print hammer
US3665852A (en) * 1970-01-19 1972-05-30 Ibm High speed front impact printer
US3735698A (en) * 1969-08-29 1973-05-29 Philips Corp Print hammer for a printing machine
US3745917A (en) * 1971-06-16 1973-07-17 Datadyne Corp Digital printer hammer assembly
US3768403A (en) * 1971-11-08 1973-10-30 Tally Corp High speed printer with leaflike impact means
US3780648A (en) * 1969-09-02 1973-12-25 Nortec Computer Devices High speed print hammer with dynamic damper means
DE2332757A1 (de) * 1972-06-28 1974-01-17 Honeywell Bull Sa Druckmaschine
US3795186A (en) * 1969-11-14 1974-03-05 Nortec Computer Devices High speed printer
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US3973661A (en) * 1974-05-08 1976-08-10 Teletype Corporation Wire-matrix printers, and electromagnetic actuator mechanisms useful in such printers
USRE30515E (en) * 1978-10-16 1981-02-17 Iomec, Inc. High speed printer
US4343239A (en) * 1979-11-02 1982-08-10 International Business Machines Corporation Electromagnetic release mechanism for print hammers or the like

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Publication number Priority date Publication date Assignee Title
FR1543794A (fr) * 1966-12-30 Ibm Système d'entraînement pour un marteau d'impression
US4010835A (en) 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
DE2837550A1 (de) * 1978-08-29 1980-03-20 Ibm Deutschland Haltesystem fuer ausloesevorrichtungen mit einem bewegungselement
DE3067861D1 (en) * 1980-09-19 1984-06-20 Ibm Deutschland Bank for the receipt of several print hammer units

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US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3049990A (en) * 1960-12-20 1962-08-21 Ibm Print hammer actuator
US3144821A (en) * 1960-10-06 1964-08-18 Ibm Printer apparatus having print force control
US3156180A (en) * 1961-09-18 1964-11-10 Holley Comp Products Company Permanent magnet hammer module in high speed printers
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3188946A (en) * 1962-12-31 1965-06-15 Ibm Hammer control mechanism for record marking machine
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers

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NL259918A (de) * 1960-01-11
AT228544B (de) * 1961-05-29 1963-07-25 Ibm Antriebseinrichtung für Druckhämmer in Druckwerken für Datenverarbeitungsanlagen

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Publication number Priority date Publication date Assignee Title
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3144821A (en) * 1960-10-06 1964-08-18 Ibm Printer apparatus having print force control
US3049990A (en) * 1960-12-20 1962-08-21 Ibm Print hammer actuator
US3156180A (en) * 1961-09-18 1964-11-10 Holley Comp Products Company Permanent magnet hammer module in high speed printers
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3188946A (en) * 1962-12-31 1965-06-15 Ibm Hammer control mechanism for record marking machine
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460469A (en) * 1966-12-30 1969-08-12 Ibm Print hammer actuator
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3735698A (en) * 1969-08-29 1973-05-29 Philips Corp Print hammer for a printing machine
US3780648A (en) * 1969-09-02 1973-12-25 Nortec Computer Devices High speed print hammer with dynamic damper means
US3635156A (en) * 1969-10-06 1972-01-18 Ncr Co Fatigue-resistant attachment for highly stressed members such as print hammers
US3795186A (en) * 1969-11-14 1974-03-05 Nortec Computer Devices High speed printer
US3653321A (en) * 1969-12-15 1972-04-04 Ibm Type mounting means for high speed front printer
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3665852A (en) * 1970-01-19 1972-05-30 Ibm High speed front impact printer
US3656425A (en) * 1970-03-20 1972-04-18 Information Printing Systems C Electromagnetic actuating means for print hammer
US3745917A (en) * 1971-06-16 1973-07-17 Datadyne Corp Digital printer hammer assembly
US3768403A (en) * 1971-11-08 1973-10-30 Tally Corp High speed printer with leaflike impact means
DE2332757A1 (de) * 1972-06-28 1974-01-17 Honeywell Bull Sa Druckmaschine
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US3973661A (en) * 1974-05-08 1976-08-10 Teletype Corporation Wire-matrix printers, and electromagnetic actuator mechanisms useful in such printers
USRE30515E (en) * 1978-10-16 1981-02-17 Iomec, Inc. High speed printer
US4343239A (en) * 1979-11-02 1982-08-10 International Business Machines Corporation Electromagnetic release mechanism for print hammers or the like

Also Published As

Publication number Publication date
FR1453936A (fr) 1966-07-22
USRE27175E (en) 1971-09-21
GB1079558A (en) 1967-08-16
AT250714B (de) 1966-11-25
CH433830A (de) 1967-04-15
DE1264120B (de) 1968-03-21
NL6509335A (de) 1966-01-26
GB1079559A (en) 1967-08-16
NL150054B (nl) 1976-07-15
BE667412A (de) 1965-11-16
SE329288B (de) 1970-10-05

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