US3279362A - Printing hammer - Google Patents

Printing hammer Download PDF

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Publication number
US3279362A
US3279362A US463263A US46326365A US3279362A US 3279362 A US3279362 A US 3279362A US 463263 A US463263 A US 463263A US 46326365 A US46326365 A US 46326365A US 3279362 A US3279362 A US 3279362A
Authority
US
United States
Prior art keywords
hammer
printing
coil
drum
supporting
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 - Lifetime
Application number
US463263A
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English (en)
Inventor
Clifford J Helms
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.)
Ricoh Printing Systems America Inc
Original Assignee
Ricoh Printing Systems America Inc
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
Priority to DENDAT1287833D priority Critical patent/DE1287833B/de
Application filed by Ricoh Printing Systems America Inc filed Critical Ricoh Printing Systems America Inc
Priority to US463263A priority patent/US3279362A/en
Priority to JP41036858A priority patent/JPS521242B1/ja
Priority to NL6608061A priority patent/NL6608061A/xx
Priority to GB26303/66A priority patent/GB1086444A/en
Application granted granted Critical
Publication of US3279362A publication Critical patent/US3279362A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position
    • 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

  • US. Patent 3,172,352 discloses a printing hammer including, in a preferred embodiment, a pair of fiat springs which conduct current to a coil mounted on the hammers shank. It is pointed out therein that such a construction provides a low friction hammer which can be rapidly moved from a rest position to an impact position, i.e. into engagement with a printing drum.
  • the aforecited patent discloses at least two hammer embodiments, the first utilizing a coil structure which extends substantially equally above and below the hammer shank and the second utilizing a coil structure which extends either above or below the shank.
  • the first embodiment is inherently balanced but requires the provision of both upper and lower magnets to gain full advantage of the coil length.
  • the second embodiment does not require both upper and lower magnets but is unbalanced and therefore requires that additional mass be provided on the shank to balance the overall structure. If the coil and shank combination are not balanced, there is likely to be a reaction on the supporting springs which would tend to collapse them after extended use. As should be apparent from what has been said thus far, the necessity of adding mass is undesirable since it tends to somewhat increase travel and contact time.
  • a printing hammer comprised of a rigid coil structure, carrying an impact tip thereon, which is supported on a pair of flexible conductive members for substantially rotational movement between a rest position and an impact position.
  • the coil housing is supported by first and second fiat spring members which are crossed and coupled to opposite sides of the coil housing.
  • the spring members extend from a supporting block which has a feature thereof, perpendicular first and second rounded surfaces.
  • a positioning block having first and second perpendicular surfaces, each surface having a series of V-grooves formed therein is provided for receiving such supporting blocks.
  • the V- grooves precisely position each supporting block with respect to translation and rotation about the X, Y, and Z axes.
  • a further feature of the invention involves the provision of a plug-in relationship between the supporting and positioning blocks.
  • the coil housing is supported on a pair of torsion bars which are coupled thereto at the center of rotation thereof.
  • FIGURE 1 is a side sectional view of a preferred embodiment of a printing hammer constructed in accordance with the present invention
  • FIGURE 2 is a horizontal sectional view taken substantially along the plane 2-2 of FIGURE 1 illustrating how the supporting blocks are positioned against a positioning block;
  • FIGURE 3 is a vertical sectional view taken substantially along the plane 33 of FIGURE 1 and illustrating a rear view of a hammer bank including hammers supported from below and suspended from above;
  • FIGURE 4(a) is a diagram illustrating the generally rotational movement of the hammer of FIGURE 1;
  • FIGURE 4(b) is a diagrammatic representation of the significant forces acting on a rigid body during impact analogous to the coil housing of FIGURE 1;
  • FIGURE 5 is a side sectional view of an alternative embodiment of the invention.
  • FIGURE 6 is a vertical sectional view taken substantially along the plane 6-6 of FIGURE 5.
  • FIGURES 1 through 3 of the drawings illustrate a high speed line printing apparatus which employs printing hammers constructed and mounted in accordance with the present invention.
  • the printing apparatus includes a printing drum 10 which is adapted to continually rotate about an axis through the center thereof.
  • Raised characters (not shown) are formed on the circumferential surface of the drum 10.
  • the characters are arranged in tracks, each track corresponding to a different position on a line to be printed.
  • the printing drum will preferably have 132 tracks, with each track containing all of the characters that the apparatus is adapted to print.
  • a bank of printing hammers 12 is provided spaced from the drum 10.
  • the hammer bank 12 usually includes a number of hammers equal to the number of tracks formed on the drum 10.
  • a printing ribbon 14 Positioned between the hammer bank 12 and the drum 10 is a printing ribbon 14 and the paper 16 to be printed upon.
  • the paper 16 is incrementally driven (by means not shown) to each new line position. After the paper .settles into a new line position, a signal is usually provided to control means (not shown) which functions to actuate each hammer just prior to the character it is to print moves into printing position.
  • a printing hammer 18 including an electrically conductive coil 20 disposed in a rigid coil housing 22, preferably formed of a lightweight material such as aluminum.
  • the central portion 24 of the coil housing 22 is left open to minimize the mass of the housing.
  • An impact tip 26 is carried on one end of the housing 22.
  • the housing 22 is supported on a pair of electrically conductive support members 28 and 30 which preferably comprise fiat spring members whose first ends 32 and 34 are secured to opposite sides of the coil housing 22.
  • the second ends 36 and 38 of the support members 28 and 30 respectively are structurally secured to a supporting block 40.
  • the supporting members 28 and 30 extend in planes which intersect each other between the supporting blocks 40 and the coil housing 22.
  • a cavity 42 is defined in the upper surface of the supporting block 40 and an extension 44 of the coil housing 22 extends therein.
  • the extension 44 is attached to the coil housing 22 (and is preferably formed integral therewith) and is provided to add additional mass to the overall structure comprised of the coil housing 22, coil 20, and impact tip 26 in order to lower the center of rotation of the structure for a purpose which will become more readily apparent hereinafter.
  • a support assembly 46 is provided which carries a plurality of individually adjustable backstops 48 adapted to engage the rear end 50 of the impact tip 26 when the printing hammer is in its rest position.
  • the front end 52 of the impact tip 26 is of course adapted to force the paper 16 against the ribbon 14 and drum 10.
  • the first ends 32 and 34 of the conductive support members 28 and 30 extend through openings 54 and 56 in the coil housing and are secured therein as by a potting material.
  • the ends 32 and 34 are respectively electrically connected to first and second terminals of the coil 20.
  • the second ends 36 and 38 of the support members 28 and 30 extend into the supporting block 40 and are connected via conductors 58 and 60 to plugs 62 and 64 which extend from the supporting block 4!
  • Both the rear surface 66 and the bottom surface 68 of the supporting block 40 are rounded, as can be best seen in FIGURES 2 and 3 and are respectively received in V- grooves 70 and 72 formed in perpendicular surfaces 74 and 76 of a positioning block 78.
  • the surface 74 of the positioning block 78 defines a plurality of receptacle pairs, each pair comprised of receptacles 80 and 82 adapted to receive plugs 62 andv 64 projecting from a supporting block 40.
  • the plugs 62 and 64 are both electrically and structurally nested within the receptacles 80 and 82.
  • Connecting terminals 84 and 86 extend outwardly from the rear surface 88 of the positioning block 78 and are electrically connected to the conductive material within the receptacles and 82.
  • the V-grooves 70 and 72 of course precisely position the supporting block and permit easy registration of all of the printing hammers.
  • a receptacle 90 is provided in the positioning block 78 below each of the V-grooves 72 and in alignment with a threaded opening 92 in each of the supporting blocks 40.
  • a screw 94 projects through each opening 90 and is threadedly received in the Opening 92 to fix the supporting block 40 in position.
  • the positioning block 78 is oriented relative to the drum 10 such that the impact tips 26 are aligned with the center line of the drum.
  • the hammer bank 12 can consist of two sections, the first section comprised of hammers 18 which are supported above a lower positioning block 78 and a second section comprised of hammers 18 depending from an upper positioning block (not shown).
  • lower and upper permanent magnet sections 96, 96' are' provided each defining a plurality of gaps 97, 97', each gap adapted to receive one of the hammers 18, 18 therein.
  • the permanent magnets can be arranged substantially as illustrated in US. patent application Serial No. 419,509, filed December 18, 1964 and assigned to the same 'assignee as the present application.
  • the permanent magnet banks are illustrated as being two deep in that application inasmuch as the coil projecting from each shank extends above and below the shank so that each hammer utilizes magnets both above and below its shank, in accordance with the present invention the permanent magnet bank need only be one deep since half of the hammers will utilize the lower magnet bank 96 and half of the hammers will utilize the upper magnet bank 96.
  • the magnet banks can be cantilevered from the support assembly 46 as illustrated.
  • FIGURE 4(a) comprises a motion diagram illustrating that the coil housing 22 exhibits substantially rotational movement about the point 99 defined by the intersection of the support members 28 and 30 when in a rest position. That is, note that the line 100 representing a line on the coil housing 22 between the openings 54 and 56 is horizontally disposed when the hammer is in the rest position. A line perpendicularly bisecting the line 100 will intersect the point 99. When a force is applied to the coil housing 22, it will be forced toward the drum 10 and it can be shown that the members 28 and 30 will flex equally as illustrated to move the line 108 to the position illustrated in dotted lines. The perpendicularly bisecing line dropped from line Will still intersect the point 99. Consequently, it should be clear that the coil housing 22 effectively rotates about this point which will henceforth be referred to as the center of rotation 99.
  • FIGURE 4(b) illustrates the body as a straight line 102 having a center of gravity G and a center of rotation O displaced by a distance F from the center of gravity G.
  • a force F which is the reaction force on the impact tip when it strikes the drum, acts on the body at a distance r from the center of gravity.
  • this equation describes an oscillatory motion whose period -r is represented by mic Km Inasmuch as a positive half cycle of this oscillatory motion represents the contact time of the hammer, it can be appreciated that contact time can be minimized by minimizing the oscillatory period which indicates that the efiective mass mk /r must be :minimized.
  • the travel time is also minimized when the efiective mass mk /r is minimized as described by Equation 2.
  • Equation 2 describes the center of percussion of the rigid body 102 rotated about point 0. It should of course be appreciated that the reaction forces acting at the center of rotation will be zero if the force F acts at the center of percussion. (See page 464 of Engineering Mechanics by Timoshenko and Young, third edition, McGraw-Hill Book Company, 1951.) Accordingly, if the dimensions of the hammer 18 are chosen such that the impact tip 26 is positioned at the center of percussion with respect to rotation of the body about point 99, the travel and contact time of the hammer will be minimized and the reactive forces on the supporting members will be reduced to substantially zero. With these considerations in mind, it should be realized that alternative structural embodiments can be provided which also have these characteristics.
  • extension 44 in the embodiment of FIG- URES 1 through 3 has been provided in order to move the center of rotation out of the area of the coil housing 22. This has been done primarily for space considerations however, and the housing 22 could indeed be mounted for rotation about a point contained therein.
  • FIGURES 5 and 6 a coil housing is provided supporting impact tip 112.
  • the extension 44 has been deleted and therefore the required spacing between the impact device 112 and the center of rotation is smaller.
  • the center of rotation may be defined at point 114 if the impact device 112 is to be positioned at the cen ter of percussion.
  • the coil housing 110 can be rotated about the point 114 by, for example, providing a pair of torsion bars 116 and 118 which extend outwardly from the housing 119 in opposite directions in line with the point 114.
  • both an upper magnet pair 120 and a lower magnet pair 122 are provided.
  • torsion bars 116 In order to provide support for the torsion bars 116, inasmuch as it is only necessary that they be able to exhibit torsional motion about their longitudinal axis, they can be surrounded by rubber or the like 124 for increased stiffness about the other two axes.
  • the magnet banks can be only one deep meaning that the impact tip need be no longer than the coil housing. Consequently, the overall hammer mass can be actually reduced over prior art embodiments. Further improvements introduced herein involve the provision of V-grooves on perpendicular surfaces of the positioning block which receive corresponding rounded surfaces of a supporting block together with the provision of plug-in means for electrically and physically coupling the supporting and positioning blocks.
  • a hammer construction comprising:
  • a rigid member including electrically energizable means for generating a first magnetic field
  • means supporting said rigid member include first and second flexible support members.
  • said electrically energizable means comprises an electrically conductive coil having first and second terminals
  • first and second support members are conductive and are respectively connected to said first and second terminals.
  • first and second support members comprise substantially flat springs each having first and second ends and secured at their first ends to a supporting block and at their second ends to said rigid member;
  • fiat springs extend in planes intersecting between said supporting block and said rigid member.
  • first and second support members comprise torsion bars extending from said rigid member in opposite directions substantially coincident with said first axis.
  • a printing apparatus including a rotating printing drum having tracks of characters thereon and a hammer bank comprised of a plurality of substantially aligned hammers, each including an impact tip and means for individually propelling each of said tips against one of said characters in a different one of said tracks, the improvement comprising:
  • each of said rigid members for rotation about a first axis between a rest position and an impact position.
  • said mounting means includes first and second support members for each of said rigid members, each support member having first and second ends;
  • the apparatus of claim 10 including a plurality of supporting blocks;
  • a printing apparatus including a rotating printing drum having tracks of characters thereon and a hammer bank comprised of a plurality of substantially aligned hammers, each including an impact tip and means for individually propelling each of said tips against one of said characters in a different one of said tracks, the improvement comprising:
  • each of said impact tips is positioned on one of said rigid members substantially coincident with the center of percussion thereof.
  • the apparatus of claim 13 including supporting blocks;
  • the apparatus of claim 14 including a positioning block defining a plurality of pairs of spaced receptacles therein;
  • each of said supporting blocks being provided with pairs of projecting contacts respectively connected to the first and second support members secured thereto;
  • the apparatus of claim 14- including a positioning block defining a plurality of slots therein;
  • each of said slots comprises a V-groove
  • each of said supporting blocks has a rounded surface received in a different one of said V-grooves.
  • said positioning block has first and second substantially perpendicular surfaces, each defining a plurality of V-grooves therein;
  • each of said supporting blocks has first and second rounded substantially perpendicular surfaces
  • Apparatus for registering a plurality of supporting blocks including:
  • a positioning block having first and second substantially perpendicular surfaces
  • said first positioning block surface defining a plurality of spaced V-grooves
  • said second positioning block surface defining a plurality of spaced V-grooves aligned with said grooves in said first positioning block surface
  • each of said supporting blocks having first and second substantially perpendicular surfaces
  • said first and second supporting block surfaces being rounded and being respectively received in aligned V-grooves in said first and second positioning block surfaces.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
US463263A 1965-06-11 1965-06-11 Printing hammer Expired - Lifetime US3279362A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DENDAT1287833D DE1287833B (de) 1965-06-11
US463263A US3279362A (en) 1965-06-11 1965-06-11 Printing hammer
JP41036858A JPS521242B1 (de) 1965-06-11 1966-06-09
NL6608061A NL6608061A (de) 1965-06-11 1966-06-10
GB26303/66A GB1086444A (en) 1965-06-11 1966-06-13 Improvements relating to printing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463263A US3279362A (en) 1965-06-11 1965-06-11 Printing hammer

Publications (1)

Publication Number Publication Date
US3279362A true US3279362A (en) 1966-10-18

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ID=23839495

Family Applications (1)

Application Number Title Priority Date Filing Date
US463263A Expired - Lifetime US3279362A (en) 1965-06-11 1965-06-11 Printing hammer

Country Status (5)

Country Link
US (1) US3279362A (de)
JP (1) JPS521242B1 (de)
DE (1) DE1287833B (de)
GB (1) GB1086444A (de)
NL (1) NL6608061A (de)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3643595A (en) * 1969-06-25 1972-02-22 Data Products Corp Printer hammer bank assembly
US3656425A (en) * 1970-03-20 1972-04-18 Information Printing Systems C Electromagnetic actuating means for print hammer
US3735698A (en) * 1969-08-29 1973-05-29 Philips Corp Print hammer for a printing machine
JPS495227A (de) * 1972-04-28 1974-01-17
US3802546A (en) * 1971-06-18 1974-04-09 Data Products Corp Web clamping apparatus
DE2406132A1 (de) * 1973-02-19 1974-08-22 Cii Honeywell Bull Anschlagvorrichtung fuer punktdrucker
US3834304A (en) * 1970-05-21 1974-09-10 Potter Instrument Co Inc Helical bar printer and hammer therefor
US3878778A (en) * 1972-01-11 1975-04-22 Suwa Seikosha Kk Printer
JPS50127522A (de) * 1974-03-27 1975-10-07
US3982622A (en) * 1974-10-04 1976-09-28 Teletype Corporation Actuator mechanisms for wire matrix printers
JPS51113417A (en) * 1975-03-28 1976-10-06 Canon Inc Small-sized printer
JPS51141020A (en) * 1975-05-29 1976-12-04 Canon Kk Printer
JPS51145622A (en) * 1975-06-06 1976-12-14 Canon Kk Printer
US4004505A (en) * 1973-11-06 1977-01-25 Compagnie Honeywell Bull (Societe Anonyme) Electromagnetic striker mechanism for a printer
US4022311A (en) * 1975-11-19 1977-05-10 Ncr Corporation Electrodynamic actuator
JPS52103217A (en) * 1976-02-20 1977-08-30 Florida Data Corp Stylus drive unit
USRE29745E (en) * 1972-01-11 1978-08-29 Shinshu Seiki Kabushiki Kaisha Printer
US4136978A (en) * 1975-10-10 1979-01-30 Optical Business Machines, Inc. High speed electromagnetic printing head
JPS5417314U (de) * 1978-07-12 1979-02-03
FR2404529A1 (fr) * 1977-09-29 1979-04-27 Interface Mechanisms Inc Dispositif d'impression par impact mecanique
JPS54159016A (en) * 1978-06-02 1979-12-15 Nippon Electric Co Dot wire driver
DE2949294A1 (de) * 1978-12-11 1980-07-31 Dataproducts Corp Druckhammer und verfahren zur herstellung desselben
US4290356A (en) * 1978-08-29 1981-09-22 International Business Machines Corporation Actuator mechanism for a print hammer or the like
US4353656A (en) * 1980-10-14 1982-10-12 Xerox Corporation Moving coil, multiple energy print hammer system including a closed loop servo
US4373440A (en) * 1979-08-13 1983-02-15 Jezbera Val K Hammer bank assembly
US4395945A (en) * 1979-08-13 1983-08-02 Dataproducts Corporation Hammer bank assembly
US4407194A (en) * 1980-02-15 1983-10-04 Dataproducts Corporation Print hammer
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils
US4833981A (en) * 1984-08-27 1989-05-30 Dataproducts Corporation Field replaceable print hammer
US5906157A (en) * 1998-05-06 1999-05-25 Banctec, Inc. High speed impact print hammer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8100882A (pt) * 1980-02-15 1981-08-25 Dataproducts Corp Aperfeicoamento em martelo impressor e conjunto de jogos de martelos impressores
US4557192A (en) * 1981-05-26 1985-12-10 International Business Machines Corporation Self restoring pivoting means and print hammer using same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643595A (en) * 1969-06-25 1972-02-22 Data Products Corp Printer hammer bank assembly
US3735698A (en) * 1969-08-29 1973-05-29 Philips Corp Print hammer for a printing machine
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3656425A (en) * 1970-03-20 1972-04-18 Information Printing Systems C Electromagnetic actuating means for print hammer
US3834304A (en) * 1970-05-21 1974-09-10 Potter Instrument Co Inc Helical bar printer and hammer therefor
US3802546A (en) * 1971-06-18 1974-04-09 Data Products Corp Web clamping apparatus
US3878778A (en) * 1972-01-11 1975-04-22 Suwa Seikosha Kk Printer
USRE29745E (en) * 1972-01-11 1978-08-29 Shinshu Seiki Kabushiki Kaisha Printer
JPS495227A (de) * 1972-04-28 1974-01-17
JPS5142521B2 (de) * 1972-04-28 1976-11-16
US3971311A (en) * 1973-02-19 1976-07-27 Compagnie Honeywell Bull (Societe Anonyme) Striking device for dot printer
DE2406132A1 (de) * 1973-02-19 1974-08-22 Cii Honeywell Bull Anschlagvorrichtung fuer punktdrucker
US4004505A (en) * 1973-11-06 1977-01-25 Compagnie Honeywell Bull (Societe Anonyme) Electromagnetic striker mechanism for a printer
JPS50127522A (de) * 1974-03-27 1975-10-07
US3982622A (en) * 1974-10-04 1976-09-28 Teletype Corporation Actuator mechanisms for wire matrix printers
JPS51113417A (en) * 1975-03-28 1976-10-06 Canon Inc Small-sized printer
JPS5510385B2 (de) * 1975-03-28 1980-03-15
JPS5746434B2 (de) * 1975-05-29 1982-10-02
JPS51141020A (en) * 1975-05-29 1976-12-04 Canon Kk Printer
JPS51145622A (en) * 1975-06-06 1976-12-14 Canon Kk Printer
JPS5759832B2 (de) * 1975-06-06 1982-12-16 Kyanon Kk
US4136978A (en) * 1975-10-10 1979-01-30 Optical Business Machines, Inc. High speed electromagnetic printing head
US4022311A (en) * 1975-11-19 1977-05-10 Ncr Corporation Electrodynamic actuator
JPS586629B2 (ja) * 1976-02-20 1983-02-05 フロリダ・デ−タ・コ−ポレ−シヨン 針駆動装置
JPS52103217A (en) * 1976-02-20 1977-08-30 Florida Data Corp Stylus drive unit
FR2404529A1 (fr) * 1977-09-29 1979-04-27 Interface Mechanisms Inc Dispositif d'impression par impact mecanique
JPS54159016A (en) * 1978-06-02 1979-12-15 Nippon Electric Co Dot wire driver
JPS619154B2 (de) * 1978-06-02 1986-03-20 Nippon Electric Co
JPS5417314U (de) * 1978-07-12 1979-02-03
US4290356A (en) * 1978-08-29 1981-09-22 International Business Machines Corporation Actuator mechanism for a print hammer or the like
DE2949294A1 (de) * 1978-12-11 1980-07-31 Dataproducts Corp Druckhammer und verfahren zur herstellung desselben
US4373440A (en) * 1979-08-13 1983-02-15 Jezbera Val K Hammer bank assembly
US4395945A (en) * 1979-08-13 1983-08-02 Dataproducts Corporation Hammer bank assembly
US4407194A (en) * 1980-02-15 1983-10-04 Dataproducts Corporation Print hammer
US4353656A (en) * 1980-10-14 1982-10-12 Xerox Corporation Moving coil, multiple energy print hammer system including a closed loop servo
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils
US4833981A (en) * 1984-08-27 1989-05-30 Dataproducts Corporation Field replaceable print hammer
US5906157A (en) * 1998-05-06 1999-05-25 Banctec, Inc. High speed impact print hammer

Also Published As

Publication number Publication date
DE1287833B (de) 1969-01-23
JPS521242B1 (de) 1977-01-13
NL6608061A (de) 1966-12-12
GB1086444A (en) 1967-10-11

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