US3889793A - Mosaic printing head - Google Patents

Mosaic printing head Download PDF

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Publication number
US3889793A
US3889793A US370136A US37013673A US3889793A US 3889793 A US3889793 A US 3889793A US 370136 A US370136 A US 370136A US 37013673 A US37013673 A US 37013673A US 3889793 A US3889793 A US 3889793A
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US
United States
Prior art keywords
armature
ring
yoke
printing head
opening
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
US370136A
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English (en)
Inventor
Sergio Cattaneo
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.)
Bull HN Information Systems Italia SpA
Original Assignee
Honeywell Information Systems Italia SpA
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Filing date
Publication date
Application filed by Honeywell Information Systems Italia SpA filed Critical Honeywell Information Systems Italia SpA
Application granted granted Critical
Publication of US3889793A publication Critical patent/US3889793A/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
    • B41J2/27—Actuators for print wires
    • B41J2/275—Actuators for print wires of clapper type

Definitions

  • a printing head for a mosaic printer includes a ringshaped structure which supports a mounting bracket, and a number of guiding tubes for the printing needles are mounted on the bracket.
  • Each of the guiding tubes has a plurality of openings and is surrounted by a porous oil impregnated sleeve for lubricating the needles.
  • An electromagnetic actuator for each needle is mounted on the ring and includes a movable armature which engages an end of the corresponding needle when the actuator is energized.
  • the core of the actuator is adjustably mounted on the ring, and an adjustment screw adjust the width at rest of the air gap and the stroke of the needle.
  • a hinged elastic system connects the armature to the yoke of the actuator and includes a curved rider to provide rolling contact with the yoke.
  • the present invention relates to impact printers used in data processing systems in which the printing of each character is obtained by means of a set of points.
  • the impression by points of a single character on paper is obtained by projecting towards a platen located on the back of the printing media the ends of a subset of metallic needles chosen among a set according to the form of the characters to be printed.
  • the impression may be accomplished at the same instant of time or in subsequent times by horizontally scanning the character form.
  • the number of needles generally used is thirty-five arranged to form a matrix of5 X 7 possible points of impression.
  • the impression needles and the respective actuation electromagnets are assembled in general on a carriage movable along the printing line to be in condition to carry on the sequential or serial impression of several characters. They form a movable printing head on the carriage.
  • the size of the electromagnets of the guiding systems of the needles and the problems of inertia, of the necessary power supply, and of dissipation cause the solution using a seven needle comb to be usually preferred.
  • the device according to the invention avoids these inconveniences and improves the condition of operation of the impression head.
  • the guiding of the needles is assured practically on all their length, by guides, having a suitable degree of rigidity, within which the needles may slide, said guides being provided with proper lubricating means ensuring a suitable lubrication along their whole length.
  • the actuating electromagnets associated with the needles are not rigidly fastened to the printing carriage, but they are mounted through the interposition of micrometric adjusting devices which allow individual adjustment both of the width at rest of the air gaps of said electromagnetic actuators and the strokes of the needles.
  • the adjusting devices are in addition easily accessible; therefore the adjustments are particularly easy.
  • the movable armature of each electromagnet is connected to the fixed part by means of a hinged elastic system which insures a minimum contact surface, and an automatic recovery of the clearances'and, at the same time, does not introduce elastic reactions hindering the rotation of the movable armature.
  • FIG. 1 is a sectional side view of a preferred embodiment of a printing head according to the invention:
  • FIG. 1a is a perspective view of a detail of the guiding elements for the impression needles used in the printing head according to the invention.
  • FIG. 2 is an exploded perspective view of the elements forming an electromagnetic actuator used in the printing head according to the invention.
  • FIG. 1 represents a sectional side view of a printing head according to the invention.
  • the head consists of a rigid support mounted on a carriage sliding on guides consisting essentially of ring I (seen in section) and of bracket 2 fixed thereto, for example by means of screws such as screw 3.
  • the ring 1 has essentially the function of supporting a certain number, for example seven, or nine, of electromagnetic actuators while bracket 2 has essentially the function of supporting an equal number of printing needles.
  • the bracket 2 is provided at one end with a flange 4 having some openings 5 radially located with respect to a center, and at the opposite end with a guiding member 6, with holes or grooves, in which some jewels, not shown, are mounted to serve as guides for the ends of the printing needles, as the one indicated by 7.
  • each printing needle is guided from the flange 4 to the flange 8 by a thin guiding tube 9.
  • Each guiding tube 9 is inserted freely in a corresponding opening 5 of flange 4 and at the opposite end is inserted in a corresponding opening 40 of flange 8 and fixed to it through soldering or cementing.
  • the guiding tubes have at intervals some openings 10 (better shown in FIG. la) obtained by milling.
  • the tubes are covered, for their whole length, except the part nearest the wing 8, with sleeves 11 of porousmaterial with negligible mechanical rigidity, for example felt or braiding.
  • the sleeves are dipped in lubricating oil, and they insure through the openings 10 a practically uniform lubrication within the guiding tubes, supplying the lubricating oil when needed and absorbing it when in excess.
  • the thickness of the tubes and the number of openings are chosen so to obtain a suitable but not excessive rigidity of the tubes themselves. In fact, the printing needles behave during the operation as tiploaded rods whose rigidity results from the sum of their intrinsic rigidity and that of the guiding tubes.
  • the needles At the end opposite to the printing side, the needles have a small head 12 designed to cooperate with an actuating arm 13 of the movable armature 14 of the electromagnetic actuators. Every needle is also supplied with a compression spring 15, with suitable elastic constant, acting between wing 4 and the head 12 of the needle and tending to push the needle itself and the movable armature 14 toward a rest position.
  • the electromagnetic actuators consist of a central cylindrical core 16, of ferromagnetic material on which an electric winding 17 is assembled, of a U-shaped yoke 18, also of ferromagneitc material, and of a movable armature 14.
  • the yoke 18 has a threaded hole 19 which is screwed on the end portion of the core 16.
  • the core 16 continues with a cylindrical projection 20 which enters a corresponding axially directed opening of the ring 1.
  • the projection 20 is provided with an axial threaded hole in which the adjustment screw 21 is screwed.
  • the screw 21 has, for example, in the screw head portion thereof, a groove 22 in which a retaining member 23 fixed to the ring 1 is inserted.
  • this retaining member is represented partially and consists of a ring having suitable notches 24 which fit the grooves of the adjustment screws.
  • the retaining member 23 is, for example, fixed to the circular body 1 through screws, such as the one indicated at 25.
  • the yoke 18 of the actuators has one arm considerably longer than the other arm 36 and in this one arm there is an opening 27 in which an extension 29 of the movable armature is housed.
  • a steel rider 28 having an opening 30 is inserted on the extension 29 and leans against the end of the armature.
  • the armature is tied to the yoke, but it is free to roll on the yoke surface, presenting a limited surface of rolling contact, and therefore a minimal friction; and, on the other hand, no substantial elastic reactions opposed to the rotation of the armature are introduced.
  • a screw adjusting the stroke of the armature and an anti-sticking plate complete the actuator.
  • the antisticking plate 34 is made of non-magnetic material and is cemented to the arm 36 of the yoke l8.
  • the armature is drilled to provide a passage for the adjustment screw 37 which is screwed into a threaded hole of the core 16.
  • the screw 37 has a head considerably larger than the hole drilled in the armature, so that it limits effectively the maximum width of the air gap between the core and the armature and therefore the stroke of the armature itself.
  • FIG. 1 shows that the spring 15 through the head 12 of the needle exerts a pressure on the armature 14 and tends to make it lean in rest position against the head of the adjustment screw 37.
  • FIGS. 1 and 2 show only one electromagnetic actuator and a needle with related guiding system, it is clear that the several (for example seven or nine) electromagnetic actuators are arranged radially on the ring 1, and a corresponding plurality of needles is assembled on bracket 2, the needles being guided by the above described tubes.
  • the described structure which is mechanically simple and strong, has the advantage of allowing individual adjustment of the stroke of the electromagnetic actuators and individual positioning of each actuator with respect to the corresponding printing needle.
  • the adjustment devices are all set externally with respect to the structure of the printing head, for an easy adjustment of the different parts; and therefore uniform performances of the different impression needles and excellent print quality may be obtained.
  • a printing head for a mosaic printer wherein a plurality of movable needles are projected against a platen said printing head comprising a ring-shaped structural supporting member, a bracket firmly connected to said ring-shaped member, said ring shaped member having a plurality of axial openings distributed circumferentially with respect to said bracket; a plurality of guiding members for said movable needles mounted on said bracket; a plurality of flat electromagnets, each electromagnet comprising a rotatable armature, a central core, a U-shaped yoke and a cylindrical projection coaxial to said central core and engaged in a corresponding one of said axial openings of said ringshaped member; each cylindrical portion and its respective axial opening defining individual means for mounting a respective one of said electromagnets in axially adjusted position; individual locking means for locking each said electromagnet in the adjusted position; individual means for adjusting the air gap between said armature in rest position and said central core; and means for securing said arma
  • the printing head of claim 1 together with axial adjustment means for said electromagnets includes a first adjustment screw coaxial to said projection and engaged in a threaded hole provided on said projection, locking means fixed to said ring-shaped member for preventing the axial movement of said adjustment screw, said locking means including a locking screw engaged in a radial threaded hole in said ring-shaped member and acting on said projection.
  • said air-gap adjusting means includes an adjustment screw engaged in a threaded hole coaxial to said central core, said movable armature being provided with an opening for allowing said screw to freely pass through said armature.
  • said means for securing said armature to said yoke includes an extension of said armature, an opening in said yoke for receiving said extension, an elastic means acting on said extension and said yoke for maintaining said extension within said opening.
  • said means for securing said armature to said yoke includes a rider mounted on said armature and cooperating with said yoke to form a turning member having a limited contact surface.
  • each needle includes a head in abutting engagement only with its respective armature.

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  • Impact Printers (AREA)
US370136A 1972-06-15 1973-06-14 Mosaic printing head Expired - Lifetime US3889793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT25698/72A IT956585B (it) 1972-06-15 1972-06-15 Perfezionamento alle testine di impressione per macchine stampan ti a composizione di carattere per punti

Publications (1)

Publication Number Publication Date
US3889793A true US3889793A (en) 1975-06-17

Family

ID=11217473

Family Applications (1)

Application Number Title Priority Date Filing Date
US370136A Expired - Lifetime US3889793A (en) 1972-06-15 1973-06-14 Mosaic printing head

Country Status (7)

Country Link
US (1) US3889793A (fr)
JP (1) JPS4964337A (fr)
CA (1) CA992387A (fr)
DE (1) DE2330883A1 (fr)
FR (1) FR2190056A5 (fr)
GB (1) GB1385298A (fr)
IT (1) IT956585B (fr)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991869A (en) * 1975-12-15 1976-11-16 General Electric Company Print head improvement
US4010836A (en) * 1974-04-10 1977-03-08 Ing. C. Olivetti & C., S.P.A. Wire printing device
US4023663A (en) * 1974-09-10 1977-05-17 U.S. Philips Corporation Matrix printer comprising lubricated printing wires
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
US4060161A (en) * 1977-01-11 1977-11-29 Ncr Corporation Vibration dampening means for printing mechanism
US4135830A (en) * 1976-06-14 1979-01-23 Brother Kogyo Kabushiki Kaisha Wire printer printing head
US4136978A (en) * 1975-10-10 1979-01-30 Optical Business Machines, Inc. High speed electromagnetic printing head
US4155661A (en) * 1976-10-28 1979-05-22 Siemens Aktiengesellschaft Mounting arrangement for electromagnet driving structures in a mosaic needle printer head
US4156960A (en) * 1977-02-28 1979-06-05 Kabushiki Kaisha Seikosha Method of manufacting a wire printer head
US4197021A (en) * 1977-05-13 1980-04-08 Kabushiki Kaisha Suwa Seikosha Printing head for a wire-type dot printer
US4226544A (en) * 1976-06-17 1980-10-07 Data Recording Instrument Company Limited Wire printing heads
US4278020A (en) * 1979-10-19 1981-07-14 International Business Machines Corporation Print wire actuator block assembly for printers
US4392431A (en) * 1980-09-10 1983-07-12 Koenig & Bauer Ag Method to maintain smooth running of ink metering elements in ink fountains of printing machines
US4396304A (en) * 1981-11-24 1983-08-02 International Computers Limited Print head and drive circuit
US4430936A (en) * 1980-06-05 1984-02-14 Ing. C. Olivetti & C., S.P.A. Striker mechanism for a high speed serial printer
US4634303A (en) * 1985-08-26 1987-01-06 Dataproducts, Inc. Actuator for dot matrix printhead
US4634302A (en) * 1985-08-26 1987-01-06 Dataproducts, Inc. Actuator for dot matrix printhead
US4687355A (en) * 1984-09-25 1987-08-18 Citizen Watch Co., Ltd. Printing head for use in dot printers
US4757760A (en) * 1984-11-13 1988-07-19 Citizen Watch Co., Ltd. Wire mask for a dot printer head apparatus
US4812061A (en) * 1986-08-28 1989-03-14 Tokyo Electric Co., Ltd. Technique for improving the wear resistance of a wire matrix printing head
US4840501A (en) * 1986-04-29 1989-06-20 Dataproducts Corporation Three pole printhead actuator
US5033884A (en) * 1988-08-29 1991-07-23 Oki Electric Industry Co., Ltd. Wire dot printer head with oil absorbing member

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5356214U (fr) * 1976-10-13 1978-05-13
JPH0239947A (ja) * 1988-07-29 1990-02-08 Seikosha Co Ltd 印字ヘッド

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728289A (en) * 1953-05-29 1955-12-27 Powers Samas Account Mach Ltd Apparatus for defining characters on impression-receiving material
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids
US3698528A (en) * 1970-04-03 1972-10-17 Ncr Co Compact print head assembly with antirebounding means
US3782520A (en) * 1971-11-04 1974-01-01 Centronics Data Computer Resilient head assembly having resilient mount

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728289A (en) * 1953-05-29 1955-12-27 Powers Samas Account Mach Ltd Apparatus for defining characters on impression-receiving material
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
US3698528A (en) * 1970-04-03 1972-10-17 Ncr Co Compact print head assembly with antirebounding means
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids
US3782520A (en) * 1971-11-04 1974-01-01 Centronics Data Computer Resilient head assembly having resilient mount

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010836A (en) * 1974-04-10 1977-03-08 Ing. C. Olivetti & C., S.P.A. Wire printing device
US4023663A (en) * 1974-09-10 1977-05-17 U.S. Philips Corporation Matrix printer comprising lubricated printing wires
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
US3991869A (en) * 1975-12-15 1976-11-16 General Electric Company Print head improvement
US4135830A (en) * 1976-06-14 1979-01-23 Brother Kogyo Kabushiki Kaisha Wire printer printing head
US4226544A (en) * 1976-06-17 1980-10-07 Data Recording Instrument Company Limited Wire printing heads
US4155661A (en) * 1976-10-28 1979-05-22 Siemens Aktiengesellschaft Mounting arrangement for electromagnet driving structures in a mosaic needle printer head
US4060161A (en) * 1977-01-11 1977-11-29 Ncr Corporation Vibration dampening means for printing mechanism
US4156960A (en) * 1977-02-28 1979-06-05 Kabushiki Kaisha Seikosha Method of manufacting a wire printer head
US4197021A (en) * 1977-05-13 1980-04-08 Kabushiki Kaisha Suwa Seikosha Printing head for a wire-type dot printer
US4278020A (en) * 1979-10-19 1981-07-14 International Business Machines Corporation Print wire actuator block assembly for printers
US4430936A (en) * 1980-06-05 1984-02-14 Ing. C. Olivetti & C., S.P.A. Striker mechanism for a high speed serial printer
US4392431A (en) * 1980-09-10 1983-07-12 Koenig & Bauer Ag Method to maintain smooth running of ink metering elements in ink fountains of printing machines
US4396304A (en) * 1981-11-24 1983-08-02 International Computers Limited Print head and drive circuit
US4687355A (en) * 1984-09-25 1987-08-18 Citizen Watch Co., Ltd. Printing head for use in dot printers
US4757760A (en) * 1984-11-13 1988-07-19 Citizen Watch Co., Ltd. Wire mask for a dot printer head apparatus
US4634303A (en) * 1985-08-26 1987-01-06 Dataproducts, Inc. Actuator for dot matrix printhead
US4634302A (en) * 1985-08-26 1987-01-06 Dataproducts, Inc. Actuator for dot matrix printhead
US4840501A (en) * 1986-04-29 1989-06-20 Dataproducts Corporation Three pole printhead actuator
US4812061A (en) * 1986-08-28 1989-03-14 Tokyo Electric Co., Ltd. Technique for improving the wear resistance of a wire matrix printing head
US5033884A (en) * 1988-08-29 1991-07-23 Oki Electric Industry Co., Ltd. Wire dot printer head with oil absorbing member

Also Published As

Publication number Publication date
CA992387A (en) 1976-07-06
IT956585B (it) 1973-10-10
JPS4964337A (fr) 1974-06-21
DE2330883A1 (de) 1974-01-03
GB1385298A (en) 1975-02-26
FR2190056A5 (fr) 1974-01-25

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