US3900094A - Matrix printer with overlapping print dots - Google Patents

Matrix printer with overlapping print dots Download PDF

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Publication number
US3900094A
US3900094A US359013A US35901373A US3900094A US 3900094 A US3900094 A US 3900094A US 359013 A US359013 A US 359013A US 35901373 A US35901373 A US 35901373A US 3900094 A US3900094 A US 3900094A
Authority
US
United States
Prior art keywords
print
column
printer head
elements
members
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
US359013A
Inventor
Raymond B Larsen
Donald E Holmes
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.)
MICRO PERIPHERALS Inc A Co OF UT
Original Assignee
Lrc 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 FR7235426A priority Critical patent/FR2155620A5/fr
Application filed by Lrc Inc filed Critical Lrc Inc
Priority to US359013A priority patent/US3900094A/en
Priority to NL7405831A priority patent/NL7405831A/xx
Priority to IT50785/74A priority patent/IT1011381B/en
Priority to DE2421658A priority patent/DE2421658A1/en
Priority to JP49050768A priority patent/JPS5014414A/ja
Priority to FR7416315A priority patent/FR2228619B3/fr
Priority to BR3841/74A priority patent/BR7403841D0/en
Publication of US3900094A publication Critical patent/US3900094A/en
Priority to US05/754,652 priority patent/US4079824A/en
Assigned to EATON CORPORATION, A CORP. OF OH. reassignment EATON CORPORATION, A CORP. OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LRC, INC.
Priority to JP62030612A priority patent/JPS62246743A/en
Application granted granted Critical
Publication of US3900094B1 publication Critical patent/US3900094B1/en
Assigned to MICRO PERIPHERALS, INC., A COMPANY OF UT reassignment MICRO PERIPHERALS, INC., A COMPANY OF UT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EATON CORPORATION, A CORP. OF OH.
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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • 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
    • B41J2/285—Actuators for print wires of plunger type

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Impact Printers (AREA)

Abstract

A matrix printer head apparatus and method of printing have been devised for high-speed printing operations in which impressions or dots formed on the print medium will overlap to form apparent solid lines. Overlapping of impressions or dots both in the horizontal and vertical directions in high-speed printing operations is accomplished by a novel and improved arrangement of the print elements and the manner in which the print elements are incrementally advanced and positively driven in forming each matrix.

Claims (14)

1. A matrix printer head comprising in combination: a plurality of print members having impression elements arranged in adjacent columns and disposed in confronting relation to a print medium, the impression elements in one column being offset vertically and laterally with respect to the impression elements in an adjacent column, said impression elements adapted to impress a matrix of dots to form each character on the print medium, print member drive means for sequentially driving selected of the print members in each column to advance their impression elements forwardly into contact with the print medium whereby the dots formed in one column are vertically and laterally offset with respect to dots formed by the next adjacent impression elements of the adjacent column, and printer head advancing means for incrementally advancing said printer head in a direction laterally of the print medium to a succession of incremental positions in forming each character, the distance between incremental positions corresponding to the spacing between adjacent columns of said impression elements, said print member drive means sequentially driving selected of the print memberS in each column at each incremental position whereby the dots formed by driving selected of said print members in one column by said print member drive means will partially overlap and be vertically aligned with the next adjacent dots previously formed by driving of the print members of the adjacent preceding column at that incremental position, so that characters having apparent solid lines are formed by the matrix of dots when the printer head has been successively advanced through a series of incremental positions in forming each character.
2. A matrix printer head according to claim 1 including timing means between said print member drive means for the print members in each column to sequentially drive the print members in one column a predetermined time interval after driving the print members of the other column into contact with the print medium at each incremental position.
3. A matrix printer head according to claim 1, said drive means for each print member including forward drive means for driving each print member to advance the impression elements into contact with the print medium, and reverse drive means for positively driving each print member and associated impression elements away from the print medium.
4. A matrix printer head according to claim 1 wherein the impression elements are arranged in a pair of spaced adjacent columns, one column of impression elements being offset less than a full dot width apart from the impression elements in the other column.
5. A matrix printer head according to claim 1 wherein the impression elements in each column are laterally offset less than a full dot width apart, and said impression elements in one column are spaced equal distances between adjacent impression elements in the other column.
6. A matrix printer head according to claim 5, said impression elements in the adjacent columns being operative to form an overlapping series of dots vertically along each column printed in a matrix and an overlapping series of dots horizontally and diagonally between columns as said print members are successively advanced to each incremental position and selected of said impression elements are sequentially advanced into contact with the print medium.
7. A matrix printer head according to claim 1 wherein said print members include a plurality of elongated flexible print wires, each of the print wires having a leading end terminating in an impression element at one end and a trailing end portion at the opposite end, said print member drive means having actuator assemblies at the trailing ends of said print wires, each actuator assembly including an armature at the trailing end of each print wire, electromagnetic forward drive means adjacent to the forward end of each armature operative to energize said armature to drive each said print wire in a forward direction, electromagnetic reverse drive means aligned adjacent to the rearward end of said armature operative to energize said armature to positively drive each said print wire in the reverse direction, and timer means for successively energizing said electromagnetic forward and reverse drive means of each actuator assembly to positively advance and retract said print wires toward and away from the print medium, respectively.
8. A matrix printer head according to claim 7, said actuator assemblies including at least one centrally disposed actuator assembly and a plurality of actuator assemblies arranged in a circle about the central actuator assembly, said print wires converging forwardly from the trailing end portions and the leading ends of said print wires extending horizontally in closely spaced, parallel relation to one another.
9. In a matrix printer head adapted for impressing a matrix of dots to form each character on a printing medium, the combination comprising: a plurality of elongated, axially movable print members each provided with a leading end portion having an impression surface at its leading terminal end and a trailing end portion including an actuator assembly, there being at least one actuator assembly disposed centrally with respect to the other actuator assemblies, and the other actuator assemblies disposed in a circle at equally spaced circumferential intervals in surrounding relation to the centrally disposed actuator assembly, each actuator assembly including positive forward and reverse drive means at opposite ends thereof and means for successively energizing said forward and reverse drive means, said print members converging forwardly from said actuator assemblies and terminating in leading end portions which extend in spaced parallel relation to one another, and a guide post provided with a series of closely spaced apertures arranged in spaced adjacent columns to receive and guide the leading ends of said print members for movement toward and away from the print medium, actuator control means associated with said forward and reverse drive means for sequentially driving selected of the print members in each column to advance their impression elements forwardly into contact with the print medium whereby the dots formed by one column of print members will touch the next adjacent impression elements of the adjacent column, printer head advancing means for incrementally advancing said printer head in a direction laterally of the print medium to a succession of incremental positions in forming each character whereby the dots formed by driving selected print members of said actuator control means in one column will touch and be vertically aligned with the next adjacent dots of the preceding series of dots formed by the adjacent column of print members at incremental positions whereby characters having apparent solid lines are formed by the matrix of dots when the printer head has been successively advanced through a series of incremental positions.
10. In a matrix printer head according to claim 9 including a common mounting plate for said actuator assemblies and printer head support means for guiding and supporting said print members for forward extension from said mounting plate through guide passages in said printer head support means, said guide post positioned at the leading end of said printer head support means.
11. In a matrix printer head according to claim 10, the guide passages of said printer head support means each having a low coefficient of friction tube lining the wall of said passage for extension of a print member therethrough, and the guide passages terminating in a common recess for extension of the leading ends of said print members therethrough.
12. In a matrix printer head according to claim 11, said print head support means including said guide post at the leading end thereof in front of the recess, said guide posts provided with apertures therein for reception of the leading ends of said print members.
13. In a matrix printer head according to claim 12, the apertures in said guide post each defining a bearing surface for high-speed movement of a print member therethrough without contacting the other print members.
14. A method of printing characters on a printing medium with a printer head having a series of print elements arranged in spaced adjacent columns comprising the steps of: arranging the print elements of one column in vertically offset relation to the print elements of the next adjacent column, selectively activating the print elements in one column to form vertically spaced impressions in a single column upon the print medium, incrementally advancing the printer head to a position in which the print elements of the other column are aligned in the plane through the impressions formed by the print element of the one column, and selectively activating the print elements of the other column to form impressions along the same column of impressions formed by the one column, the vertical distance between adjacent offset print elements of the columns being such that the impressions formed by offset adjacent print elements in a siNgle column will partially overlap to form an apparent solid line of print.
US359013A 1971-10-07 1973-05-10 Matrix printer with overlapping print dots Expired - Lifetime US3900094A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR7235426A FR2155620A5 (en) 1971-10-07 1972-10-06
US359013A US3900094A (en) 1973-05-10 1973-05-10 Matrix printer with overlapping print dots
NL7405831A NL7405831A (en) 1973-05-10 1974-05-01
IT50785/74A IT1011381B (en) 1973-05-10 1974-05-03 IMPROVEMENT IN MATRIX TYPE PRINTOUTS
DE2421658A DE2421658A1 (en) 1973-05-10 1974-05-04 MATERIAL PRINTING DEVICE
JP49050768A JPS5014414A (en) 1973-05-10 1974-05-09
FR7416315A FR2228619B3 (en) 1973-05-10 1974-05-10
BR3841/74A BR7403841D0 (en) 1973-05-10 1974-05-10 YARN MATRIX PRINTER
US05/754,652 US4079824A (en) 1971-10-07 1976-12-27 Double speed dot matrix printhead
JP62030612A JPS62246743A (en) 1973-05-10 1987-02-12 Matrix printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US359013A US3900094A (en) 1973-05-10 1973-05-10 Matrix printer with overlapping print dots

Publications (2)

Publication Number Publication Date
US3900094A true US3900094A (en) 1975-08-19
US3900094B1 US3900094B1 (en) 1987-05-05

Family

ID=23411965

Family Applications (1)

Application Number Title Priority Date Filing Date
US359013A Expired - Lifetime US3900094A (en) 1971-10-07 1973-05-10 Matrix printer with overlapping print dots

Country Status (6)

Country Link
US (1) US3900094A (en)
JP (2) JPS5014414A (en)
BR (1) BR7403841D0 (en)
DE (1) DE2421658A1 (en)
IT (1) IT1011381B (en)
NL (1) NL7405831A (en)

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
US4016965A (en) * 1975-08-19 1977-04-12 Ncr Corporation Matrix print head and solenoid driver
US4034841A (en) * 1974-10-23 1977-07-12 Nippon Electric Co., Ltd. Print wire actuating device for a dot matrix printer
US4050568A (en) * 1975-12-05 1977-09-27 Sperry Rand Corporation Stylus carriage drive
US4059183A (en) * 1976-12-30 1977-11-22 International Business Machines Corporation Dot matrix printer with slanted print head and modular skewing of dot pattern information
US4079824A (en) * 1971-10-07 1978-03-21 Xerox Corporation Double speed dot matrix printhead
US4081067A (en) * 1977-03-07 1978-03-28 Ncr Corporation Internal vibration dampening means for printing mechanism
US4084678A (en) * 1974-07-31 1978-04-18 Siemens Aktiengesellschaft Printer needle guide means for mosaic printers
US4098388A (en) * 1976-11-04 1978-07-04 Fabrique d'Horlogerie CHS, Tissot & Fils. S.A. Printing wire for use in a matrix printer and method for making same
US4119383A (en) * 1976-07-20 1978-10-10 Oki Electric Industry Co., Ltd. Method and apparatus for inserting intermediate dots in a dot matrix using a dot printer
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4149807A (en) * 1976-03-04 1979-04-17 Facit Aktiebolag Method of typewriting or printing
US4155661A (en) * 1976-10-28 1979-05-22 Siemens Aktiengesellschaft Mounting arrangement for electromagnet driving structures in a mosaic needle printer head
US4159882A (en) * 1977-06-30 1979-07-03 R. C. Sanders Technology Systems, Inc. High quality printer
US4211496A (en) * 1979-01-29 1980-07-08 Small Business Administration Printing solenoid
US4217820A (en) * 1975-01-09 1980-08-19 Johannes Lorsch Apparatus for printing on transparency slides
US4239401A (en) * 1978-11-01 1980-12-16 Plessey Peripheral Systems Impact printer hammer assembly
US4242003A (en) * 1978-10-16 1980-12-30 Xerox Corporation Multi-pass matrix printing
US4255062A (en) * 1978-04-17 1981-03-10 Mannesmann Aktiengesellschaft Matrix print head
US4268179A (en) * 1979-10-29 1981-05-19 E. I. Du Pont De Nemours And Company Method and system for reproducing identification characters
US4279521A (en) * 1979-11-02 1981-07-21 International Business Machines Corporation Wire matrix print head
EP0040313A2 (en) * 1980-05-20 1981-11-25 Monarch Marking Systems, Inc. Matrix printer
US4308794A (en) * 1978-07-13 1982-01-05 Contardo Adamoli Hammer assembly for a serial typing device
US4389127A (en) * 1979-12-10 1983-06-21 Florida Data Corporation High speed dot matrix impact printer
US4431319A (en) * 1980-08-18 1984-02-14 Epson Corporation Method and apparatus for serial dot printing
US4447166A (en) * 1981-06-04 1984-05-08 Tokyo Electric Co., Ltd. Printing head of dot printer
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
US4523867A (en) * 1983-07-25 1985-06-18 Genicom Corporation Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control
US4586835A (en) * 1984-04-20 1986-05-06 International Business Machines Corporation Printer for printing characters in two alternative print qualities
US4589786A (en) * 1982-08-05 1986-05-20 Nec Corporation Impact printer head capable of printing a dot at a distance narrower than a thickness of a printer unit
WO1987003539A1 (en) * 1985-12-12 1987-06-18 Data Card Corporation Direct solenoid drive imprinting mechanism
US4687354A (en) * 1985-09-12 1987-08-18 Kazumi Tanaka Dot matrix printer head
US4744684A (en) * 1985-11-05 1988-05-17 Canon Kabushiki Kaisha Impact-type recording apparatus
US4749291A (en) * 1986-09-23 1988-06-07 Pentel Kabushiki Kaisha Inking system for wire dot matrix printer
US4812062A (en) * 1986-12-12 1989-03-14 Canon Kabushiki Kaisha Print hammer with flux detection for print pressure control
US4929103A (en) * 1980-11-06 1990-05-29 Mannesmann Ag Shiftable guide for a matrix printhead
US5044793A (en) * 1983-07-08 1991-09-03 Canon Kabushiki Kaisha Hammer device having adjustable striking force
US5150976A (en) * 1987-05-08 1992-09-29 Siemens-Nixdorf Informationssysteme Ag Matrix printing head with forward and return articulated-armature magnets
US5320435A (en) * 1988-06-09 1994-06-14 Datacard Corporation Direct solenoid drive imprinting mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1096234A (en) * 1977-06-13 1981-02-24 Harold A. Long Wear minimizing means for printing mechanism

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217640A (en) * 1963-04-30 1965-11-16 Burroughs Corp Electromagnetic actuating means for wire printers
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3627096A (en) * 1969-04-25 1971-12-14 Ibm Wire printing method
US3670861A (en) * 1970-09-10 1972-06-20 Extel Corp Carriage drive for high speed printer
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids
US3729079A (en) * 1970-10-30 1973-04-24 Extel Corp Printing head for high speed dot matrix printer
US3743898A (en) * 1970-03-31 1973-07-03 Oded Eddie Sturman Latching actuators
US3771634A (en) * 1971-05-06 1973-11-13 Bausch & Lomb Surface pattern stylus board

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946337A (en) * 1972-09-06 1974-05-02

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217640A (en) * 1963-04-30 1965-11-16 Burroughs Corp Electromagnetic actuating means for wire printers
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3627096A (en) * 1969-04-25 1971-12-14 Ibm Wire printing method
US3743898A (en) * 1970-03-31 1973-07-03 Oded Eddie Sturman Latching actuators
US3670861A (en) * 1970-09-10 1972-06-20 Extel Corp Carriage drive for high speed printer
US3729079A (en) * 1970-10-30 1973-04-24 Extel Corp Printing head for high speed dot matrix printer
US3771634A (en) * 1971-05-06 1973-11-13 Bausch & Lomb Surface pattern stylus board
US3690431A (en) * 1971-06-14 1972-09-12 Centronics Data Computer Print head assembly containing solenoids

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079824A (en) * 1971-10-07 1978-03-21 Xerox Corporation Double speed dot matrix printhead
US4084678A (en) * 1974-07-31 1978-04-18 Siemens Aktiengesellschaft Printer needle guide means for mosaic printers
US4034841A (en) * 1974-10-23 1977-07-12 Nippon Electric Co., Ltd. Print wire actuating device for a dot matrix printer
US4217820A (en) * 1975-01-09 1980-08-19 Johannes Lorsch Apparatus for printing on transparency slides
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
US4016965A (en) * 1975-08-19 1977-04-12 Ncr Corporation Matrix print head and solenoid driver
US4050568A (en) * 1975-12-05 1977-09-27 Sperry Rand Corporation Stylus carriage drive
US4149807A (en) * 1976-03-04 1979-04-17 Facit Aktiebolag Method of typewriting or printing
US4119383A (en) * 1976-07-20 1978-10-10 Oki Electric Industry Co., Ltd. Method and apparatus for inserting intermediate dots in a dot matrix using a dot printer
US4155661A (en) * 1976-10-28 1979-05-22 Siemens Aktiengesellschaft Mounting arrangement for electromagnet driving structures in a mosaic needle printer head
US4098388A (en) * 1976-11-04 1978-07-04 Fabrique d'Horlogerie CHS, Tissot & Fils. S.A. Printing wire for use in a matrix printer and method for making same
US4059183A (en) * 1976-12-30 1977-11-22 International Business Machines Corporation Dot matrix printer with slanted print head and modular skewing of dot pattern information
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
DE2857357A1 (en) * 1977-06-30 1980-03-13 Sanders Tech Syst METHOD AND DEVICE FOR THE PRODUCTION OF HIGH QUALITY LETTERING CHARACTERS IN THE MOSAIC GRID FOR IMPELLER PRINTERS
US4159882A (en) * 1977-06-30 1979-07-03 R. C. Sanders Technology Systems, Inc. High quality printer
US4255062A (en) * 1978-04-17 1981-03-10 Mannesmann Aktiengesellschaft Matrix print head
US4308794A (en) * 1978-07-13 1982-01-05 Contardo Adamoli Hammer assembly for a serial typing device
US4242003A (en) * 1978-10-16 1980-12-30 Xerox Corporation Multi-pass matrix printing
US4239401A (en) * 1978-11-01 1980-12-16 Plessey Peripheral Systems Impact printer hammer assembly
US4211496A (en) * 1979-01-29 1980-07-08 Small Business Administration Printing solenoid
US4268179A (en) * 1979-10-29 1981-05-19 E. I. Du Pont De Nemours And Company Method and system for reproducing identification characters
US4279521A (en) * 1979-11-02 1981-07-21 International Business Machines Corporation Wire matrix print head
US4389127A (en) * 1979-12-10 1983-06-21 Florida Data Corporation High speed dot matrix impact printer
EP0040313A3 (en) * 1980-05-20 1982-10-27 Monarch Marking Systems, Inc. High quality printer
EP0040313A2 (en) * 1980-05-20 1981-11-25 Monarch Marking Systems, Inc. Matrix printer
US4431319A (en) * 1980-08-18 1984-02-14 Epson Corporation Method and apparatus for serial dot printing
US4929103A (en) * 1980-11-06 1990-05-29 Mannesmann Ag Shiftable guide for a matrix printhead
US4447166A (en) * 1981-06-04 1984-05-08 Tokyo Electric Co., Ltd. Printing head of dot printer
US4589786A (en) * 1982-08-05 1986-05-20 Nec Corporation Impact printer head capable of printing a dot at a distance narrower than a thickness of a printer unit
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
US5044793A (en) * 1983-07-08 1991-09-03 Canon Kabushiki Kaisha Hammer device having adjustable striking force
US4523867A (en) * 1983-07-25 1985-06-18 Genicom Corporation Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control
US4586835A (en) * 1984-04-20 1986-05-06 International Business Machines Corporation Printer for printing characters in two alternative print qualities
US4687354A (en) * 1985-09-12 1987-08-18 Kazumi Tanaka Dot matrix printer head
US4744684A (en) * 1985-11-05 1988-05-17 Canon Kabushiki Kaisha Impact-type recording apparatus
WO1987003539A1 (en) * 1985-12-12 1987-06-18 Data Card Corporation Direct solenoid drive imprinting mechanism
US4749291A (en) * 1986-09-23 1988-06-07 Pentel Kabushiki Kaisha Inking system for wire dot matrix printer
US4812062A (en) * 1986-12-12 1989-03-14 Canon Kabushiki Kaisha Print hammer with flux detection for print pressure control
US5150976A (en) * 1987-05-08 1992-09-29 Siemens-Nixdorf Informationssysteme Ag Matrix printing head with forward and return articulated-armature magnets
US5320435A (en) * 1988-06-09 1994-06-14 Datacard Corporation Direct solenoid drive imprinting mechanism

Also Published As

Publication number Publication date
DE2421658A1 (en) 1974-11-28
JPS62246743A (en) 1987-10-27
NL7405831A (en) 1974-11-12
JPS5014414A (en) 1975-02-15
US3900094B1 (en) 1987-05-05
BR7403841D0 (en) 1975-01-21
IT1011381B (en) 1977-01-20

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Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

RR Request for reexamination filed

Effective date: 19860121

B1 Reexamination certificate first reexamination
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Effective date: 19880331

Owner name: MICRO PERIPHERALS, INC., A COMPANY OF UT,CALIFORNI

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Effective date: 19880331