US3897865A - Dot printing apparatus - Google Patents

Dot printing apparatus Download PDF

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Publication number
US3897865A
US3897865A US423833A US42383373A US3897865A US 3897865 A US3897865 A US 3897865A US 423833 A US423833 A US 423833A US 42383373 A US42383373 A US 42383373A US 3897865 A US3897865 A US 3897865A
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US
United States
Prior art keywords
wires
printing elements
geometrical
print head
printing
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
US423833A
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English (en)
Inventor
Daniel P Darwin
Brandt M Griffing
Harry S Kiel
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
Original Assignee
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to US423833A priority Critical patent/US3897865A/en
Priority to GB4332874A priority patent/GB1450346A/en
Priority to IT28320/74A priority patent/IT1022792B/it
Priority to AU74226/74A priority patent/AU479048B2/en
Priority to FR7439730A priority patent/FR2253629B1/fr
Priority to JP13053974A priority patent/JPS5642469B2/ja
Priority to CA214,168A priority patent/CA1023615A/en
Priority to CH1559574A priority patent/CH576870A5/xx
Priority to DE2456816A priority patent/DE2456816C3/de
Priority to NLAANVRAGE7415670,A priority patent/NL177007C/xx
Priority to SE7415240A priority patent/SE401414B/xx
Priority to BE151398A priority patent/BE823228A/xx
Priority to ES433444A priority patent/ES433444A1/es
Application granted granted Critical
Publication of US3897865A publication Critical patent/US3897865A/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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires

Definitions

  • ABSTRACT Wire matrix dot printing apparatus in which a plurality of wire impact members are driven by electromagnetic means arranged in a circular pattern at the rear ofa wire matrix print head. The wires are caused to converge following the arc of free bending in the wire from the circular array at the driver end to a parallel and colinear alignment at the printing or output end of the print head.
  • the individual wires are continuously guided from the end where the drivers are located to a point where they are nearly parallel and colinear by utilizing an improved two-piece wire guide consisting of an inner cone with grooves on its surface and an outer shell which confines the wires to the grooves in the inner cone.
  • the shape of the inner cone is such that the paths of the wires converge from a circular array at the driver end of the print head to a nearly colinear and parallel array at the output end of the print head.
  • Wire matrix print heads are generally wellknown and have been provided in a variety of previous de signs.
  • the Preisinger US. Pat. No. 3,108,534, assigned to the Assignee of the present invention. teaches an early form of wire matrix print heads in which a plurality of print wires were constrained and aligned by guides to form a straight line at the output or printing end of the head while the drivers were ar ranged in a fan array at the opposite end of the wires.
  • 3,584,575 illustrates a printing head of the wire matrix type in which the guide channels for the printing wires extend between electromagnetic drivers and a mouthpiece on a curved path which corresponds to the free bending line of the printing wires; however, in the mouthpiece itself, the curve departs from the free bending curve to angled converging channels which bring the wires together so that, in the extended position, the wires form a straight line when they are forced to extend from the mouthpiece by the electromagnetic drivers.
  • the drivers in the Distl patent are arranged in a fan array and hence the path length of each wire is slightly different. This leads to a condition of excessive wear on the outer or most curved wires.
  • Another object of this invention is to provide an improved wire matrix print head in which the paths of the individual wires or print members are equal, have equal bending, and are parallel at the output instead of com vergent.
  • An outer shell is provided which matches the contours of the inner cone and confines the individual wires or print members to the grooves in the cone.
  • the wires are parallel and lie nearly in a straight line. being slightly staggered left and right of vertical as viewed end-on.
  • a short unsupported area follows after which the wires are brought into final linear alignment by a simple guide shoe which brings the parallel wires together in a straight vertical line.
  • FIG. I illustrates a partial cross-sectional view, approximately full size, of the improved wire matrix print head of the present invention.
  • FIG. 2 illustrates a view of the print head shown in FIG. 1 taken from the left (rear) of the print head.
  • FIGS. 30 and 3/ illustrate views of the print head taken from the right. or output. end of the print head shown in FIG. 1.
  • FIGS. 414C illustrate schematically the general form and geometrical requirements of the inner cone and outer shell utilized in the present invention.
  • FIG. illustrates an enlarged partial cross-section of part of FIG. 1.
  • FIGS. 6a and 6b illustrate the attachment ofthe wires to the armatures. in enlarged partial cross-sectional views.
  • the overall print head I is a generally conical shaped structure.
  • Head 1 is made of. for example. injection molded plastic such as a material commercially avail able under the trade name Nylaglass and produced by the Fiberfil Corporation.
  • Other suitable plastic materials would be any of the well-known nylons, flurocarbons, and various filled composition plastics, but metals could also be utilized to advantage; the choice being one mainly of cost and ease of manufacture.
  • Print head I is basically a two-part construction comprising a wire guide 2 and a driver head assembly 3.
  • the wire guide assembly 2 consists of an outer cone or shell 31 visible in FIG.
  • a plurality of individual wires 4 are disposed in a circular array at the driver end 3 of the print head I.
  • the circular array of drivers may be seen to advantage in FIG. 2.
  • Each individual wire 4 passes through an aperture 5 in an indi vidual fixed pole piece 6 and ends in a movable armature 7 where it is attached in place in a manner described later.
  • Armature 7 is made of soft iron or other suitable electromagnetic material exhibiting high magnetism.
  • the armature 7 and pole piece 6 are disposed in the aperture of an annular electromagnetic coil 8 which is wound about a bobbin 9, the hollow inner portion of which forms the core or working gap of the electromagnetic driver system in which the armature 7 and the pole piece 6 are disposed as noted.
  • compression return spring 10 is mounted in a recess or counterbore ll, of the fixed pole piece 6. Spring 10 abuts against the armature 7. For clarity. the spring 10 and recess ll are not shown in FIG. I.
  • the compression spring 10 is under compression as assembled and the pole piece 6 is held in place in element 17 under force fit or by uti izing a screw or friction fit. not shown.
  • Armature 7 has a clearance which allows it to slide freely in the inner core of bobbin 9. Under the impetus of return spring 10. armature 7 is forced to the left to the position illustrated in FIG. 1, thereby drawing wire 4 back into its unextended position at the output end 12 of print head I.
  • the movable armature 7 is held in place by a backstop l3 made of non-magnetic material which is preferably sintered tungsten carbide or another hard material to reduce wear between the abutting surfaces of armature 7 and backstop [3.
  • Each backstop I3 is held resiliently in place by a lobe of a multi-lobed leaf spring 14.
  • Spring 14 is clamped to the rear of the driver portion 3 of head 1 by a screw 15 and a plate 16 which act as a clamp to hold leaf spring 14in compression to maintain backstops 13 as well as magnetic pieces 7, l7, and 18 in position under about 10 lbs. of spring pressure.
  • Backstop l3 rests on a portion of a C-shaped magnetic return circuit made up of an L-shaped piece 17 of soft iron or similar highly magnetic material. and a straight portion 18 abutting the L-shaped portion to form a general C-shape as shown.
  • Portion I8 is also of ferromagnetic material and has an aperture in which an extension of the core of bobbin 9 is centered and within which resides movable armature 7.
  • Electromagnetic coil 8 may suitably be made of 230 turns of No. gauge copper magnet grade wire which may be driven by a current source of approximately 3.5 amperes at 24 volts for 375 microseconds, not shown.
  • Circuit board carries the coil lead connections for coils 8 together with the usual diode suppressors.
  • the individual parts making up the driver portion 3 of head 1 are suitably mounted on a formed plastic chassis 19 which is actually a flanged portion of the back of inner core member 28 of guide 2. This can be seen to advantage in FIG. 4.
  • the resulting structure is of quite low mass, as will be readily appreciated, and is thus an easily movable print head assembly which may be utilized in a variety of printer mechanisms and which will require little power to move it along a line of print if movable print head operation is desired.
  • the salutory effects achieved in movable print head designs by the use of very low mass print heads will be readily appreciated by those of skill in the art.
  • Individual print wires 4 are suitably made of Tungsten Carbide and have a diameter of approximately 0.011 inches so that they are quite flexible and easily conformed to the free bending path to be defined below.
  • Spring 21 is of the wavy spring washer type. It is used to locate the bobbin 9 against the surface of 18 toward which it will be pulled when the coil 8 is energized. Spring 21 insures that coil 8 and bobbin 9 will be held tightly against the C-shaped magnetic return elements 18 previously discussed.
  • FIG. 2 a rear or left side view as shown in FIG. 1 of print head 1 is illustrated.
  • the circular array formed by non-magnetic backstop members 13 is clearly visible and the multilobed leaf spring 14 together with clamping plate 16 and screw 15 are visible.
  • eight symmetrically displaced backstops 13 corresponding to eight symmetrically disposed driver assemblies are shown.
  • Eight individual print wires 4 are contemplated as a preferred embodiment. although it is well-known that the number of wires utilized may be adjusted and varied to suit different printing fonts or criteria as desired.
  • the entire assembly of members l3,18 and 17, 17 not being visible in FIG. 2 is held in place by leaf spring 14 which is clamped by plate 16 and by screw 15 as it is better seen in FIG. 1.
  • the individual Lshaped members of the magnetic return circuit 17 are held in place on flange 19 by spring pressure of about 10 lbs. from spring 14.
  • FIG. 3a a sectional view of the output end of the wires 4 as they emerge from guide 2 is shown. It may be seen that the ends of the wires are parallel as they emerge from the guide, but do not lie in a vertical linear array since they are slightly staggered left and right of vertical. As shown in FIG. 3b, a simple array of holes in the guide shoe portion 24 affixed to the end of guide 2 (shown in FIG. 1) aligns the wires into a vertical line.
  • Lubrication may conveniently be applied to the individual wires 4 by providing an aperture in nose piece 24 illustrated in FIG. 1 as aperture 25 in which a lubricant saturated material may be inserted and brought into contact with the exposed portion of the wires in aperture 26.
  • the lubricant material is not shown for the purpose of simplicity, but may be a simple felt wick or some more sophisticated design, as de sired.
  • guide 2 On assembly, guide 2 with the nose portion 24 having the final alignment tip in it, is mounted together with shell 31 via means of screws to the core 28. Circuit board 35 is clamped between shell 31 and the flange 19 of core 28 as shown. The Lshaped pieces of magnetic return circuit, elements 17, are then inserted and held in place with the fixed pole pieces 6 inserted in them. Next, springs 21 are inserted over the pole pieces 6 and bobbins 9 containing the coils 8 are slid into place. As shown in FIG.
  • individual armatures 7 having wires 4 brazed in brass ferrules 33 which are embedded in plas tic 34 in recesses in armatures 7 to hold wires 4 in place are then provided with return spring 10 and are dropped into position with the wires extending through apertures 5 in the pole pieces 6 and on through the guide assembly 2 to the output, or nose portion 24.
  • the return circuit completing pieces 18 are then set in place and retaining backstops 13 are placed over the pieces 18.
  • the backstop members 13, affixed by a tab 27 to leaf spring 14, are clamped in place by a clamp plate 16 and screw 15, thereby completing the mechanical assembly of the print head.
  • the individual wires 4, which protrude in the initially assembled state due to being provided at a slightly greater length than necessary, are then ground off flush with one another to approximately 0.003 inches protrusion from nose piece 24, thereby completing the manufacturing operation of the print head.
  • FIGS. 4a4c a schematic view of a typical inner cone 28 is shown together with outer mating shell 31.
  • the inner core 28 is described generally as conical, it will be appreciated that the surface depicted departs from a true conical shape in several respects, but for simplicitie's sake is referred to as essentially conical.
  • the surface of the inner guide piece 28 can be described geometrically as being formed by joining a circle in one plane with a straight line in another parallel and spaced plane by utilizing numerous circular arc segments to define a generally concave sur' face which has a circle at one end and a straight line at the other.
  • the actual inner member 28 which results is somewhat more difficult to depict graphically, but it starts from a circular face 29 and follows generally con cave surfaces having grooves 30 to the exit point on the end surface where the individual grooves are parallel and are nearly colinear as seen in FIG. 40.
  • the arcuate line segments defining a concave sur face do not converge to a straight line, but to a slim, generally rectangular shape at which it becomes impractical to continue the guide surface any further.
  • the inner member 28 is made of molded plastic and the grooves 30 are molded in place. Except for a slight amount of material on each side of the grooves 30, the remaining plastic material of inner member 28 may be removed or, by proper construction of the original mold, left out for weight savings and cost reduction as illustrated.
  • the individual grooves 30 are then seen to be on the concave surface formed by line segments at the top of what will be individual ribs emanating from the central portion of the core 28, but this refinement in technique and design of the construction does not alter the basic path of the wires or the geometrical construction described.
  • the arcuate segments required to build up the generally concave surface elements are the arcs described by the free bending path of individual wires of the length required to traverse the distance from the driver end at the circular array to the final output end of the print head previously discussed. The shorter the wires, it may be seen, the sharper will be the bending radius for a given placement of wire drivers.
  • the individual wires are approximately 3 inches long and the diameter of the circular array at the driving end is approximately 2% inches at the end of the wires.
  • the length of the small rectangle to which the wires converge along their concave path is approximately one-tenth inches which is the height of the printed characters which may be produced on the printing medium using individual wires of 0.011 inches diameter and eight in number.
  • the outer shell member 31 can have an outer surface shape of any desired form, but to conserve material, it is generally conical shaped as shown. It may, as is obvious, carry the grooves 30 instead of having them on the core 28. Its interior surface is molded to match the exterior surfaces and contours of the inner member 28.
  • the chassis support 19 for the driver end 3 is preferably molded as a portion or extension of the inner member 28 as illustrated in FIGS. 4b-4c. This simplifies the construction and provides a portion to which fastening screws 20 can be inserted to hold the outer shell elemerit 31 in place as illustrated in FIGS. 1 and 4b and locates the solenoids properly with respect to the grooves 30.
  • the improved printing head apparatus described is equally useful in both moving print head and fixed print head designs. Similarly. the ease of manufacture of the print head, which utilizes basically only two molded plastic parts for the guide means, is greatly improved.
  • the improved wire matrix print head by utilizing wires of nearly equal length, equal bending and a continuous guide surface from the input end to the point where the wires are aligned and parallel. will be readily appreciated as a step forward to those skilled in the art.
  • the inherent simplicity of construction and design plus equalization of stresses makes for a long useful life for the subject print head.
  • printing heads constructed according to the teachings of this specification and utilizing eight printing elements have been built and tested to work perfectly in excess of 300 X wire drives for each wire. These printing heads have been approximately 4 inches long, 2% inches in diameter at the circular end. and produce parallel aligned printing elements having a bend radius of approximately 6 inches each. Total mass of such a head is approximately 210 grams.
  • Dot printing head apparatus comprising:
  • said guide means comprises an inner member defining said geometrical surface of said supporting means and an outer shell member for confining said printing elements to lie in said geometrical surface.
  • said inner member defining said geometrical surface has grooves on its outer surface for confining said printing elements to lie on said geometrical surface and be retained by said mating outer shell member in position.
  • said print elements are parallel to one another at said portion of said guide means which is approximately rectangular in cross-sectional shape.
  • said inner member is a shaped geometrical solid ap proximately defined by a circle in a first horizontal plane. said circle being connected to a line lying in a second horizontal plane parallel to said first plane, said connection being by means of a plural ity of arcuate line segments arrayed so as to form a generally concave exterior surface of said shaped geometrical solid.
  • said arcuate line segments are taken from a circle defined by the free bending line of one of said printing elements.

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  • Impact Printers (AREA)
US423833A 1973-12-11 1973-12-11 Dot printing apparatus Expired - Lifetime US3897865A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US423833A US3897865A (en) 1973-12-11 1973-12-11 Dot printing apparatus
GB4332874A GB1450346A (en) 1973-12-11 1974-10-07 Wire matrix print head
IT28320/74A IT1022792B (it) 1973-12-11 1974-10-11 Apparecchiatura di stampa di tipo a matrice
AU74226/74A AU479048B2 (en) 1973-12-11 1974-10-11 A wire matrix printhead
FR7439730A FR2253629B1 (enrdf_load_stackoverflow) 1973-12-11 1974-10-16
JP13053974A JPS5642469B2 (enrdf_load_stackoverflow) 1973-12-11 1974-11-14
CA214,168A CA1023615A (en) 1973-12-11 1974-11-19 Wire print guide
CH1559574A CH576870A5 (enrdf_load_stackoverflow) 1973-12-11 1974-11-22
DE2456816A DE2456816C3 (de) 1973-12-11 1974-11-30 Druckkopf für Drahtdrucker
NLAANVRAGE7415670,A NL177007C (nl) 1973-12-11 1974-12-02 Drukkop voor een draadmatrixdrukinrichting.
SE7415240A SE401414B (sv) 1973-12-11 1974-12-05 Punkttryckhuvud
BE151398A BE823228A (fr) 1973-12-11 1974-12-11 Tete d'impression par points pour imprimante a fils
ES433444A ES433444A1 (es) 1973-12-11 1974-12-30 Aparato de impresion por puntos.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US423833A US3897865A (en) 1973-12-11 1973-12-11 Dot printing apparatus

Publications (1)

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US3897865A true US3897865A (en) 1975-08-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US423833A Expired - Lifetime US3897865A (en) 1973-12-11 1973-12-11 Dot printing apparatus

Country Status (12)

Country Link
US (1) US3897865A (enrdf_load_stackoverflow)
JP (1) JPS5642469B2 (enrdf_load_stackoverflow)
BE (1) BE823228A (enrdf_load_stackoverflow)
CA (1) CA1023615A (enrdf_load_stackoverflow)
CH (1) CH576870A5 (enrdf_load_stackoverflow)
DE (1) DE2456816C3 (enrdf_load_stackoverflow)
ES (1) ES433444A1 (enrdf_load_stackoverflow)
FR (1) FR2253629B1 (enrdf_load_stackoverflow)
GB (1) GB1450346A (enrdf_load_stackoverflow)
IT (1) IT1022792B (enrdf_load_stackoverflow)
NL (1) NL177007C (enrdf_load_stackoverflow)
SE (1) SE401414B (enrdf_load_stackoverflow)

Cited By (24)

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Publication number Priority date Publication date Assignee Title
US4004671A (en) * 1974-12-16 1977-01-25 Lrc, Inc. Wire matrix print head
US4016965A (en) * 1975-08-19 1977-04-12 Ncr Corporation Matrix print head and solenoid driver
US4051940A (en) * 1974-08-14 1977-10-04 Siemens Aktiengesellschaft Mosaic needle printer head using plunger armature solenoid arrangements
US4081067A (en) * 1977-03-07 1978-03-28 Ncr Corporation Internal vibration dampening means for printing mechanism
US4091909A (en) * 1975-03-05 1978-05-30 Texas Instruments Incorporated Wire matrix printer printhead assembly
US4134691A (en) * 1976-01-05 1979-01-16 Matschke General Research Company, Inc. Printing head
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4166314A (en) * 1976-03-24 1979-09-04 Siemens Aktiengesellschaft Magnetically actuated needle printing head and method of manufacture
EP0005640A1 (en) * 1978-05-22 1979-11-28 Ledex, Inc. Print wire solenoid
US4211496A (en) * 1979-01-29 1980-07-08 Small Business Administration Printing solenoid
US4218148A (en) * 1976-01-05 1980-08-19 Printer Associates Matrix printing cell and head assembly
US4280767A (en) * 1978-02-09 1981-07-28 International Business Machines Corporation Printing apparatus
EP0026549A3 (en) * 1979-10-02 1982-02-03 Philips Patentverwaltung Gmbh Wire print head
EP0041218A3 (de) * 1980-05-30 1982-05-12 Siemens Aktiengesellschaft Nadeldruckkopf
US4365902A (en) * 1981-06-22 1982-12-28 Ncr Corporation Wire matrix print head
US4433926A (en) 1979-09-03 1984-02-28 Oki Electric Industry Co., Ltd. Printer head
US4441830A (en) * 1982-03-29 1984-04-10 Ncr Corporation Printing solenoid
US4443122A (en) * 1979-05-14 1984-04-17 Blomquist James E Dot matrix print head
US4468142A (en) * 1982-11-12 1984-08-28 Genicom Corporation Pint wire actuator
US4518269A (en) * 1980-09-25 1985-05-21 Epson Corporation Serial printer
EP0174829A3 (en) * 1984-09-13 1987-04-22 Tokyo Electric Co., Ltd. Process for producing a dot printer head
US4697939A (en) * 1982-09-17 1987-10-06 Canon Kabushiki Kaisha Wire dot printer with improved wire dot head
US4755068A (en) * 1987-01-30 1988-07-05 Dh Technology, Inc. Dot matrix print head assembly
US4773779A (en) * 1985-12-11 1988-09-27 International Business Machines Corporation Printer ribbon cartridge with flexible ribbon guides and integral ribbon shield

Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
JPS5279115U (enrdf_load_stackoverflow) * 1975-12-10 1977-06-13
JPS52136711U (enrdf_load_stackoverflow) * 1976-04-09 1977-10-17
DE2728093A1 (de) * 1976-06-24 1978-01-12 Ricoh Kk Druckerkopfanordnung
USRE30743E (en) 1976-08-20 1981-09-15 Hewlett-Packard Company Thermal printer-plotter system for multi-directional printing and plotting
JPS53106219A (en) * 1977-02-25 1978-09-16 Hitachi Ltd Printing head
DE2713886C2 (de) * 1977-03-29 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum Führen der Druckernadeln in einem Mosaiknadeldruckwerk
JPS53149607U (enrdf_load_stackoverflow) * 1977-04-28 1978-11-25
CA1096234A (en) * 1977-06-13 1981-02-24 Harold A. Long Wear minimizing means for printing mechanism
JPS54119407U (enrdf_load_stackoverflow) * 1978-02-07 1979-08-21
JPH0569711B2 (enrdf_load_stackoverflow) * 1978-03-10 1993-10-01 Dh Ass
JPS54138716U (enrdf_load_stackoverflow) * 1978-03-17 1979-09-26
US4214836A (en) * 1978-03-24 1980-07-29 Digital Equipment Corporation Impact print head
JPS58159006U (ja) * 1982-04-14 1983-10-24 小松フオ−クリフト株式会社 無人走行車の舵取角検出装置
US4501506A (en) * 1983-02-25 1985-02-26 Ncr Corporation Dot matrix print head

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US2129065A (en) * 1937-07-06 1938-09-06 Joseph N Loop Apparatus for printing characters
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
US3467232A (en) * 1967-08-31 1969-09-16 Burroughs Corp Dot printing apparatus
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US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
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US3672482A (en) * 1970-08-31 1972-06-27 Ibm Wire matrix print head
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids

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NL256071A (enrdf_load_stackoverflow) * 1959-09-26
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
DE2119416A1 (de) * 1971-04-21 1972-10-26 Nixdorf Computer AG, 4 790 Paderborn Mosaikdruckkopf
DE2119417A1 (de) * 1971-04-21 1972-11-16 Nixdorf Computer Ag, 4790 Paderborn Führungsvorrichtung für die Nadeln eines Nadeldruckkopfes
DE2119641C3 (de) * 1971-04-22 1975-05-15 Anker-Werke Ag, 4800 Bielefeld Schreibkopf für Nadeldruckwerke

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US2129065A (en) * 1937-07-06 1938-09-06 Joseph N Loop Apparatus for printing characters
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
US3467232A (en) * 1967-08-31 1969-09-16 Burroughs Corp Dot printing apparatus
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3584575A (en) * 1968-11-12 1971-06-15 Johann Distl Mosaic printing head and device for producing the same
US3627096A (en) * 1969-04-25 1971-12-14 Ibm Wire printing method
US3672482A (en) * 1970-08-31 1972-06-27 Ibm Wire matrix print head
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051940A (en) * 1974-08-14 1977-10-04 Siemens Aktiengesellschaft Mosaic needle printer head using plunger armature solenoid arrangements
US4004671A (en) * 1974-12-16 1977-01-25 Lrc, Inc. Wire matrix print head
US4091909A (en) * 1975-03-05 1978-05-30 Texas Instruments Incorporated Wire matrix printer printhead assembly
US4016965A (en) * 1975-08-19 1977-04-12 Ncr Corporation Matrix print head and solenoid driver
US4218148A (en) * 1976-01-05 1980-08-19 Printer Associates Matrix printing cell and head assembly
US4134691A (en) * 1976-01-05 1979-01-16 Matschke General Research Company, Inc. Printing head
US4166314A (en) * 1976-03-24 1979-09-04 Siemens Aktiengesellschaft Magnetically actuated needle printing head and method of manufacture
US4081067A (en) * 1977-03-07 1978-03-28 Ncr Corporation Internal vibration dampening means for printing mechanism
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4280767A (en) * 1978-02-09 1981-07-28 International Business Machines Corporation Printing apparatus
US4200401A (en) * 1978-05-22 1980-04-29 Ledex, Inc. Print wire solenoid
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Also Published As

Publication number Publication date
NL177007B (nl) 1985-02-18
JPS5642469B2 (enrdf_load_stackoverflow) 1981-10-05
GB1450346A (en) 1976-09-22
DE2456816A1 (de) 1975-06-19
SE7415240L (enrdf_load_stackoverflow) 1975-06-12
DE2456816C3 (de) 1982-10-07
ES433444A1 (es) 1977-02-16
DE2456816B2 (de) 1977-12-08
CA1023615A (en) 1978-01-03
JPS5091415A (enrdf_load_stackoverflow) 1975-07-22
FR2253629A1 (enrdf_load_stackoverflow) 1975-07-04
SE401414B (sv) 1978-05-02
FR2253629B1 (enrdf_load_stackoverflow) 1976-12-31
NL7415670A (nl) 1975-06-13
BE823228A (fr) 1975-04-01
AU7422674A (en) 1976-04-15
CH576870A5 (enrdf_load_stackoverflow) 1976-06-30
NL177007C (nl) 1985-07-16
IT1022792B (it) 1978-04-20

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