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US3929214A - Wire matrix ballistic impact print head - Google Patents

Wire matrix ballistic impact print head Download PDF

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Publication number
US3929214A
US3929214A US507060A US50706074A US3929214A US 3929214 A US3929214 A US 3929214A US 507060 A US507060 A US 507060A US 50706074 A US50706074 A US 50706074A US 3929214 A US3929214 A US 3929214A
Authority
US
United States
Prior art keywords
guide
styli
print head
armature
stylus
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
US507060A
Other languages
English (en)
Inventor
Donald G Hebert
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.)
LEAR SIEGLER DIVERSIFIED HOLDINGS CORP A CORP OF
D & D Ass
D & D Associates
Original Assignee
D & D Ass
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 D & D Ass filed Critical D & D Ass
Priority to US507060A priority Critical patent/US3929214A/en
Priority to GB29787/75A priority patent/GB1494935A/en
Priority to IT26049/75A priority patent/IT1040331B/it
Priority to CA233,303A priority patent/CA1046843A/en
Priority to FR7525116A priority patent/FR2285246A1/fr
Priority to JP50097220A priority patent/JPS5142614A/ja
Priority to DE2536217A priority patent/DE2536217C3/de
Application granted granted Critical
Publication of US3929214A publication Critical patent/US3929214A/en
Assigned to LEAR SIEGLER DIVERSIFIED HOLDINGS CORP., A CORP. OF DE reassignment LEAR SIEGLER DIVERSIFIED HOLDINGS CORP., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAPISTAN CORP.
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
    • B41J2/27—Actuators for print wires
    • B41J2/275—Actuators for print wires of clapper type
    • 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 A wire matrix ballistic impact print head for delivering printing impacts to a record medium under control of information format control circuitry and including a plurality of impact print wires or styli, a guide for translating the plurality of styli from a circular arrangement at the impact delivering end of the styli, a plurality of electromagnetic actuators for selectively driving the styli during a print cycle of operation of the print head, and a unitary connector for maintaining the armature of each electromagnetic actuator in proper positional alignment with a print stylus, for simultaneously adjusting all armatures to approximately the same de-energized position, for preventing bounce of the armature after an energized actuator is deenergized and for establishing a reference plane to which all styli are referenced.
  • the present invention relates generally to printing apparatus, and more particularly, to a high-speed matrix-type ballistic impact print head.
  • Printers employing wire matrix ballistic impact print heads provide multiple hard copies of information at a relatively high speed. These printers are characterized in that for each print cycle, the printer does not print an entire character per impact but instead use an array of wire styli to print selected combinations of dots serially onto the recording medium so that as the recording medium is moved relative to the print head, successive print cycles generate alpha-numeric characters or other informational indicia.
  • Another object of the present invention is to provide a high speed wire matrix ballistic impact print head which employs a unitary connector for simultaneously adjusting all the actuators within the print head such that all actuated styli strike the record medium at substantially the same instant of time.
  • the high speed wire matrix ballistic print head includes a plurality of wire styli inserted for movement within a guide.
  • the guide translates the circular formation of the impact receiving ends of the styli to a straight line formation of the impact delivering ends of the styli.
  • An individual actuator is provided for engaging the impact receiving end of each stylus.
  • a unitary connector is also provided which includes means for holding the armature in contact with a magnetic structure to form an actuator means for holding each armature in proper alignment with its associated stylus, means for simultaneously adjusting the air gap between the armature and the electromagnet of the actuator, means forming a reference surface for referencing all styli, and damping means for eliminating bounce of the armatures and styli after the actuators are deactivated during a print cycle.
  • An advantage of the present invention is that it minimizes the variance in length of the styli, thereby allowing the simultaneous adjustment of the position of all styli within the guide.
  • the print head includes a unitary multifunction connector instead of the plurality of individual connectors as in the prior art, thereby reducing the mass of the print head.
  • Still another advantage of the present invention is the use of a unitary connector for providing simultaneous adjustment of all actuators such that all of the styli strike the record medium at substantially the same time.
  • FIG. 1 is a perspective view of a print head in accordance with thepresent invention
  • FIG. 2 is a cross'sectional view taken along the line 2-2 of FIG. 1 illustrating the major components of the print head;
  • FIG. 3 is a front elevational. view of the guide shown in FIG. 1;
  • FIG. 4 is a plan view of the second translation element of the guide shown in FIG. 3;
  • FIG. 5 is a plan view of the third translation element of the guide shown in FIG. 3;
  • FIG. 6 is a bottom view of the fourth translation element of theg'uide shown in FIG. 3;
  • FIG. 7 is a schematic diagram showing the electrical connectors of the actuator coils for the print head shown in FIG. 1;
  • FIG. 8 is a plan view of the print head shown in FIG. 1 with the unitary connector and the armatures of the actuators removed;
  • FIG. 9 is a bottom view of the unitary connector shown in FIG. 1.
  • a print head I0 in accordance with the present invention is shown in FIG. I connected to control circuitry 12 by means of the wires 14 and a plug 16.
  • a ribbon 18 is disposed in between the bottom of print head 10 and paper 20.
  • FIG. 2 is a side elevational cross-section view illus trating the major components of the print head 10.
  • a guide 22 is provided for receiving a stylus 24 and constraining it to move along a curved path.
  • the stylus 24 has a plastic cap 26' attached to its impact receiving end to enlarge the area of the impact receiving surface.
  • Stylus 24 has a spring 28 disposed at its upper end which exerts an upward force upon cap 26 to resiliently bias stylus 24 upwardly relative to guide 22.
  • Guide 22 includes four translational guide elements 30, 32, 34 and 36, which accomplish the translation of the nine styli 24 from a circular formation in the first guide element to a straight line formation in the fourth guide element 36. The translation is accomplished by passing each stylus 24 through a separate hole 38 in the first element 30, through a separate hole 40 in the second element 32, through a separate hole 42 in the third element 34 and into a defined position within a bearing 44 of the fourth element 36.
  • FIG. 3 illustrates a front elevational view of guide 22 showing a side wall 46 and a side wall 48 terminating in the fourth translation element 36.
  • Side wall 46 and a sidewall 48 are provided with two sets of facing grooves 50 and 54 and 52 and 56 for receiving the edges of guide elements 32 and 34 respectively.
  • the grooves 50 and 52 extend deeper into the sidewall to form keyways for receiving the locating key tabs 64 and 66 of guide elements 32 and 34.
  • a pair of mounting flanges 58 and 60 extend laterally from the upper ends of side walls 46 and 48.
  • Guide 22 is configured circular in shape above flanges 58 and 60, and terminates in a circularly aperatured surface which forms first guide element 30.
  • a post 62 extends from the first translation element 30.
  • FIG. 4 is a plan view of the second guide element 32 showing the styli guide holes 40 arranged in an eliptical pattern.
  • the key 64 extends from the side of element 32 to orientate the placement of element 32 within guide 22 as mentioned above.
  • FIG. 5 is a plan view of the third guide element 34 showing the location of the styli guide holes 42.
  • the arrangement of the guide holes 42 is of a generally elongated oval configuration more or less intermediate the eliptical configuration shown in FIG. 4 and the straight line configuration shown in FIG. 6.
  • the key 66 extends from the side of element 34 for orientating the element within guide 22.
  • FIG. 6 is a bottom view of the fourth guide element 36 of guide 22 showing the location of bearing 44 within guide 22.
  • Bearing 44 aligns the lower ends, the impacting ends, of the plurality of styli 24 in the desired linear arrangement.
  • the bearing 44 is of a material which resists wear, has a low coefficient of friction and has a low coefficient of thermal expansion.
  • a base plate 70 is used as the base for the construction of the print head 10.
  • Plate 70 is provided with a central aperture 72 through which the circular portion of guide 22 extends.
  • a plurality of holes 83 are provided in the base plate 70 for mounting the nine actuators thereto.
  • Guide 22 is connected to base plate 70 by means of the mounting flanges 58 and 60 (see FIG. 2) which are affixed to the lower surface of plate 70.
  • a coil 74, a center pole 76, an L-shaped outer pole 78 and an armature 80 form the electromagnetic actuators used in the print head.
  • a hole 82 is provided in the horizontal leg of the L-shaped outer pole'78 for receiving the lower extremity of center pole 76. Hole 82 has a diameter which is the same as the outer dimension of center pole 76 so as to provide a forced fit therebetween.
  • the center pole 76 of each actuator has a threaded lower end 84 which extends through the hole 83 in base plate 70. The center pole 76 and outer pole 78 combination is held in place by a nut 86 threaded onto end 84.
  • a wiring/connector board 88 (see also FIG. 1) has a opening 90 provided therein for receiving an outer pole 78.
  • Board 88 also has an aperture 92 through which the circular portion of guide 22 extends.
  • Nine additional holes 93 are provided in board 88 through which the nine center poles 76 of the nine actuators pass.
  • Coil 74 is mounted around the center pole 76 on each actuator and wired to the wiring/connector board 88.
  • FIG. 7 is a schematic diagram illustrating the electrical connection of the actuator coils 74 to the board 88.
  • the nine coils 74 are wired with one end of each coil 74 commonly connected and the other end of each coil 74 wired to a separate connection point on edge connector 91 which is formed integral with board 88 as shown in FIG. 8.
  • FIG. 8 a plan view of the print head 10 is shown with the armatures 80 and the unitary connector 94 removed.
  • FIG. 8 illustrates the construction of the print head 10 up to the point heretofore described.
  • the nine stylus heads 26 are shown positioned above the first guide element 30 of guide 22.
  • Board 88 is shown mounted between the coils 74 and the magnetic structures formed by the center poles 76 and the outer poles 78 of the nine actuators.
  • Mounting holes 95 are provided in base plate 70 for mounting the completed print head 10 to a printing system.
  • the post 62 of guide 22 has a threaded hole 96 provided therein.
  • the unitary connector 94 is mounted by means of a screw 97 and washer 98 to the post 62 of guide 22.
  • Screw 97 passes through opening 130 in connector 94 and threads into the opening 96 of post 62.
  • Connector 94 has a circular central portion 100 with an annular groove 102 provided in its bottom surface.
  • An O-ring 104 is inserted in groove 102 to act as a shock absorber and to provide a reference surface for the stylus striking ends of the armatures 80.
  • Each arm 106 extends from central portion 100.
  • Each arm 106 has associated with it a first armature receiving structure 108 and a second armature receiving structure 110.
  • One end of each armature 80 is received and held in place by structure 108 and the other end of each armature is received and guided by structure 110.
  • arms 106 apply forces to the cantilevered distal ends of the armatures causing their stylus impacting ends to rotate about the fulcrum formed by the top edge of pole 78 and upwardly into engagement with O-ring 104.
  • the heads 26 of the styli 24 are maintained in contact with the ends of armatures 80 by means of the forces applied by the springs 28.
  • FIG. 9 is a bottom view of the unitary connector 94 showing one armature 80 located in position relative to one .of the arms 106.
  • the armature 80 On its outermost end, the armature 80 has notches 112 and 114 which mesh with first and second walls 116 and 118 of the first receiving structure 108 of arm 106.
  • the central portion 100 has nine armature receiving structures formed around its periphery. Structure 110 is formed by first and second walls 120 and 122. At its innermost extending end 126, armature 80 is narrowed so that it passes between the two walls 120 and 122 of the receiving structure 110.
  • the O-ring 104 provides a reference surface against which all of the armatures 80 are referenced.
  • Unitary connector 94 serves six separate and distinct functions. First, it holds each armature 80 in contact with the corresponding outer pole 78 (along line 124) so as to complete the magnetic circuit of the actuator as used within the print head 10. Second, it acts as a resilient, force applying member applying a moment to each armature 80 causing it to tend to rotate about the outer pole 78 and away from the contact with the corresponding stylus 26.- Armature 80 is thereby rockably mounted upon pole 78 with its narrow end portion 126 in contact with the reference surface formed by O-ring 104. Third, the unitary connector acts as a means for aligning the end 126 of each armature 80 with the cap 26 of its corresponding stylus 24.
  • connector 94 acts as an adjusting means for simultaneously adjusting the air gap (see FIG. 2) between each of the armatures 80 (at point 128) and the corresponding center poles 76 of the respective actuators. As a result of this adjustment, the position of all the styli 24 are uniformly adjusted within guide 22. Fifth, connector 94 forms a reference surface against which the armatures 80 and cap 26 of styli 24 are referenced such that all actuated styli 24 impact the record medium at substantially the same instant of time during a print cycle.
  • the unitary connector 94 includes a shock absorbing O-ring 104 which absorbs the energy of the armatures 80 and styli 24 as they return to their rest positions when the actuators are deactivated. The absorbtion of the kinetic energy within a particular armature 80 and stylus 24 at the end of a print cycle prevents the armature 80 or the stylus 24 from bouncing and thereby causing spurious imprints following the print cycle.
  • the screw 97 is passed through hole 130 and tightened to pull the center portion 100 down toward post 62.
  • the air gap between center pole 76 and armature 80 will decrease.
  • the moment exerted on armature 80 by arm 106 is increased.
  • the two-piece structure of the outer pole 78 and centerpole 76 could be replaced by a single, cast structure of suitable material.
  • additional outer poles could be designed into the actuator to improve the magnetic circuit associated with the actuator-
  • the multi-pole structure could be constructed of a plurality of separate elements or could be made of a single cast structure of proper material.
  • the base plate 70 could also be included into any casting so as to lower the cost of manufacturing.
  • print head is capable of generating nine impressions during each print cycle.
  • Alpha-numeric characters or other information is generated by a sequence of print cycles. For example, the
  • letter E is formed by selectively activating various combinations of the nine styli 24 during five separate print cycles. Normally, the top seven styli 24 are used to generate letters having no below-the-line projections. Letters requiring below-the-line formation are printed using in addition the lower two styli. An example is that illustrated by the lower case letter g.
  • the control circuitry 12 selects which combination of the nine styli 24 will be actuated during each print cycle.
  • the print head 10 in one printer embodiment, is moved one print increment with respect to the paper 20 and the ribbon 18.
  • the relative movement can be made either by moving only print head 10, or by moving only paper 20 and ribbon 18, or by moving the print head 10 and the paper 20 (and the ribbon 18).
  • the printing speed of print head 10 allows high resolution information to be generated within. a reasonable time.
  • the information generated may take the form of both upper and lower case printed letters, script, pictures, figures, mathematical notations, etc.
  • the coil 74 is de-energized.
  • the moment exerted on armature 80 by arm 106 causes it to rotate away from the center pole 76 and to return into contact with O-ring 104.
  • the energy in the returning armature 80 and the stylus 24 is absorbed by the dampening material of the 'O-ring 104 thereby preventing bounce of either armature 80 or stylus 24, thus preventing spurious imprints to be made during a print c cle.
  • a wire matrix ballistic impact print head comprismg:
  • each of said electromagnetic structures having an outer pole, a center pole coupled to said outer pole, and a coil disposed around one of said poles;
  • N armatures disposed radially about said guide means, each of said armatures being associated with one of said electromagnetic structures to form an electromechanical actuator for transferring electromechanical energy to a stylus, and each of said armatures having a stylus engaging end and an outer end that extends in cantilevered fashion outside of said outer pole;
  • each of said styli being of an elongated rod-like configuration having a head end for engagement by the stylus engaging end of one of said armatures and a printing end for impacting a recording medium when the stylus is propelled through said guide means by one of said actuators;
  • a unitary connector having a central portion connected to said guide means and N resilient arms extending radially outward therefrom, each of said arms engaging the outer end of one of said armatures for applying a moment of force thereto tending to cause the stylus engaging end to rotate about said outer pole toward said central portion.
  • a wire matrix ballistic impact print head as recited in claim 1 wherein said central portion includes a shock absorbing means against which the stylus engaging end of each of said armatures is held by said moments of force when the actuator associated therewith is deenergized.
  • a wire matrix ballistic impact print head as recited in claim 2 wherein the central portion of said connector is affixed to said guide means by an adjusting means which when tightened causes said connector to be pulled towards said base to simultaneously adjust the air gaps between the armature and the center pole of each of said electromagnetic actuators.
  • each of said arms further includes means for holding the stylus engaging ends of each of said armatures in operative alignment with a corresponding one of said styli.
  • a wire matrix ballistic impact print head as recited in claim 4 wherein said central portion is affixed to said guide means by an adjusting means whichwhen tightened causes said connector to be pulled towards said base to simultaneously adjust by like degree the air gaps and between the armature and the center pole of each of said electromagnetic actuators.
  • a wire matrix ballistic impact print head as recited in claim 1 wherein said N electromagnetic structures are arranged in a circular array on said base and wherein said printing ends of said styli are aligned in a row.
  • a wire matrix ballistic impact print head comprising:
  • a base plate having a central aperture
  • a guide connected to said base plate and extending through said central aperture, the top end of said guide having N guide apertures arranged in a circular array, and the bottom end of said guide having N guide apertures arranged in a straight line array;
  • N styli each having an enlarged head at one end and passing through one of said springs, through one of said guide apertures in said top end of said guide and through one of said guide apertures in said bottom end of said guide, said springs serving to resiliently bias said styli into a rest position;
  • each of said structures having an outer pole, a center pole coupled to said outer pole, and a coil mounted around one of said poles;
  • electrical connecting means forming individual connections to the other ends of each of said coils and through which each of said coils may be energized;
  • N elongated armatures each having a stylus engaging end and an outer end, and each being associated with one of said electromagnetic structures and pivotable about one of said outer poles, the respective combinations of armature and electromagnetic structure forming N electromagnetic actuators for selectively propelling various ones of said styli through said guide apertures; and unitary connector coupled to said base plate and including a central portion having a shock absorbing means and N arms radiating from said central portion, each of said arms (1) engaging one of said outer ends to hold the associated armature in contact with one of said outer poles to form an electromagnetic actuator, (2) holding the associated armature in alignment with one of said heads of one of said styli, and (3) providing a moment of force to the associated armature tending to cause the armature to rotate about the associated outer pole and into engagement with said shock absorbing means, said connector further including an adjustment means for enabling'the air gaps between the armatures and the center poles of each of said electromagnetic actuators to be adjusted simultaneously.

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US507060A 1974-09-18 1974-09-18 Wire matrix ballistic impact print head Expired - Lifetime US3929214A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US507060A US3929214A (en) 1974-09-18 1974-09-18 Wire matrix ballistic impact print head
GB29787/75A GB1494935A (en) 1974-09-18 1975-07-16 Wire matrix ballistic impact print head
IT26049/75A IT1040331B (it) 1974-09-18 1975-08-04 Testa stampante ad impatto balisti co del tipo a matrice afili
FR7525116A FR2285246A1 (fr) 1974-09-18 1975-08-12 Tete imprimante a impact balistique du type a matrice
CA233,303A CA1046843A (en) 1974-09-18 1975-08-12 Wire matrix ballistic impact print head
JP50097220A JPS5142614A (en) 1974-09-18 1975-08-12 Waiya matorikusugatadandoshogagatainjihetsudo
DE2536217A DE2536217C3 (de) 1974-09-18 1975-08-13 Führungskappe für einen Drahtmatrix- Schlagdruckkopf

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US507060A US3929214A (en) 1974-09-18 1974-09-18 Wire matrix ballistic impact print head

Publications (1)

Publication Number Publication Date
US3929214A true US3929214A (en) 1975-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US507060A Expired - Lifetime US3929214A (en) 1974-09-18 1974-09-18 Wire matrix ballistic impact print head

Country Status (7)

Country Link
US (1) US3929214A (ja)
JP (1) JPS5142614A (ja)
CA (1) CA1046843A (ja)
DE (1) DE2536217C3 (ja)
FR (1) FR2285246A1 (ja)
GB (1) GB1494935A (ja)
IT (1) IT1040331B (ja)

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US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer
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DE2808306A1 (de) * 1977-02-28 1978-08-31 Centronics Data Computer Druckkopf fuer punktmatrixdruck
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JPS5356214U (ja) * 1976-10-13 1978-05-13
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US4230038A (en) * 1977-06-23 1980-10-28 Helmut Falk Matrix print head assembly
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JPS5658881A (en) * 1979-10-19 1981-05-22 Hitachi Ltd Wire matrix type printing head
JPS5777583A (en) * 1980-10-31 1982-05-14 Canon Inc Guide plate support for wire dot head
JPS5818742U (ja) * 1981-07-30 1983-02-04 東芝テック株式会社 ドツトプリンタヘツド
JPS57115362A (en) * 1981-10-28 1982-07-17 Ricoh Co Ltd Dot printer
JPS58106841U (ja) * 1982-01-12 1983-07-20 三菱電機株式会社 タイムスイツチ
JPS5953743U (ja) * 1982-10-01 1984-04-09 三菱電機株式会社 タイムスイツチ
JPS6053134U (ja) * 1983-09-20 1985-04-15 松下電工株式会社 タイマの設定子構造
JPS60255452A (ja) * 1984-05-31 1985-12-17 Copal Co Ltd 記録ヘツド
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US4049107A (en) * 1974-10-08 1977-09-20 Societe D'applications Generales D'electricite Et De Mecanique Sagem Printing devices or heads for printers or the like and a process for making such a printing head
US4136978A (en) * 1975-10-10 1979-01-30 Optical Business Machines, Inc. High speed electromagnetic printing head
US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer
DE2718519A1 (de) * 1976-06-28 1978-01-05 Xerox Corp Typenumsetzungsgeraet
US4029190A (en) * 1976-06-28 1977-06-14 Xerox Corporation Font conversion apparatus
US4060161A (en) * 1977-01-11 1977-11-29 Ncr Corporation Vibration dampening means for printing mechanism
US4165940A (en) * 1977-02-28 1979-08-28 Centronics Data Computer Corp. Free flight head assembly for dot matrix printers and the like
DE2808306A1 (de) * 1977-02-28 1978-08-31 Centronics Data Computer Druckkopf fuer punktmatrixdruck
FR2381628A1 (fr) * 1977-02-28 1978-09-22 Centronics Data Computer Tete d'impression par frappe par inertie pour imprimante a matrice de points
US4081067A (en) * 1977-03-07 1978-03-28 Ncr Corporation Internal vibration dampening means for printing mechanism
DE2809428A1 (de) * 1977-03-07 1978-09-14 Ncr Co Druckvorrichtung
FR2383019A1 (fr) * 1977-03-07 1978-10-06 Ncr Co Dispositif amortisseur pour appareil d'impression matricielle a fils
FR2388677A1 (fr) * 1977-04-28 1978-11-24 Ncr Co Appareil d'impression comprenant un dispositif d'amortissement des vibrations de l'element d'impression
US4143979A (en) * 1977-05-04 1979-03-13 Texas Instruments Incorporated Printhead needle cap
US4222674A (en) * 1977-05-13 1980-09-16 Kabushiki Kaisha Suwa Seikosha Head portion of a dot printer
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4244658A (en) * 1978-02-01 1981-01-13 Kabushiki Kaisha Suwa Seikosha Dot printer head
WO1979000738A1 (en) * 1978-03-10 1979-10-04 Dh Ass Matrix print head assembly
FR2419166A1 (fr) * 1978-03-10 1979-10-05 Dh Ass Ensemble de tete d'impression a matrice
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
FR2420429A1 (fr) * 1978-03-24 1979-10-19 Digital Equipment Corp Tete d'impression par percussion
US4214836A (en) * 1978-03-24 1980-07-29 Digital Equipment Corporation Impact print head
US4240756A (en) * 1978-07-26 1980-12-23 Ku Joseph P Optimized wire matrix impact print head
FR2443933A1 (fr) * 1978-12-15 1980-07-11 Dataproducts Corp Aiguille a boule pour tete d'impression et procede et dispositif de fabrication de ladite aiguille
US4256948A (en) * 1978-12-15 1981-03-17 Dataproducts Corporation Integral beaded stylus wire and method of making same
US4300845A (en) * 1979-05-14 1981-11-17 Qwint Systems, Inc. Dot matrix print head
US4443122A (en) * 1979-05-14 1984-04-17 Blomquist James E Dot matrix print head
US4265549A (en) * 1979-05-21 1981-05-05 Centronics Data Computer Corp. Flat flexible printed circuit cable for a print head
DE2927385A1 (de) * 1979-07-04 1981-01-08 Mannesmann Ag Klappanker-druckkopf fuer einen nadeldrucker
US4335969A (en) * 1979-07-04 1982-06-22 Mannesmann Aktiengesellschaft Print head
WO1981000829A1 (en) * 1979-09-24 1981-04-02 Dh Ass Wire matrix print head assembly
US4278020A (en) * 1979-10-19 1981-07-14 International Business Machines Corporation Print wire actuator block assembly for printers
US4407591A (en) * 1980-08-21 1983-10-04 Ing. C. Olivetti & C., S.P.A. Ballistic wire matrix print head
US4518269A (en) * 1980-09-25 1985-05-21 Epson Corporation Serial printer
EP0058901A3 (en) * 1981-02-25 1983-07-20 Honeywell Information Systems Italia S.P.A. Electromagnet assembly for mosaic printing head and related manufacturing method
EP0058901A2 (en) * 1981-02-25 1982-09-01 HONEYWELL BULL ITALIA S.p.A. Electromagnet assembly for mosaic printing head and related manufacturing method
US4602881A (en) * 1982-10-12 1986-07-29 Ing. C. Olivetti & C., S.P.A. Wire printing device with internal supports for thermal conduction
US4502799A (en) * 1983-02-25 1985-03-05 Ncr Corporation Dot matrix print head
US4496256A (en) * 1983-03-29 1985-01-29 Ncr Corporation Impact printing apparatus
US4561790A (en) * 1985-01-28 1985-12-31 International Business Machines Corporation Wire matrix print head apparatus
US4632580A (en) * 1985-03-25 1986-12-30 Ncr Corporation Dot matrix print head dampening mechanism
US4832515A (en) * 1986-07-28 1989-05-23 Kabushiki Kaisha Toshiba Printing head for a wire dot-matrix printer
US4755068A (en) * 1987-01-30 1988-07-05 Dh Technology, Inc. Dot matrix print head assembly
US5435656A (en) * 1989-09-18 1995-07-25 Mannesmann Aktiengesellschaft Back stop structure for matrix pin print head
US5449239A (en) * 1992-07-21 1995-09-12 Seiko Epson Corporation Impact dot head with resiliently mounted wire guide

Also Published As

Publication number Publication date
JPS5142614A (en) 1976-04-10
GB1494935A (en) 1977-12-14
DE2536217C3 (de) 1987-07-30
FR2285246A1 (fr) 1976-04-16
JPS5527860B2 (ja) 1980-07-23
DE2536217A1 (de) 1976-04-08
DE2536217B2 (de) 1979-12-13
FR2285246B1 (ja) 1982-11-05
IT1040331B (it) 1979-12-20
CA1046843A (en) 1979-01-23

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