EP0267720A2 - Flexible Drahtführung für Punktmatrixdrucker - Google Patents

Flexible Drahtführung für Punktmatrixdrucker Download PDF

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Publication number
EP0267720A2
EP0267720A2 EP87309679A EP87309679A EP0267720A2 EP 0267720 A2 EP0267720 A2 EP 0267720A2 EP 87309679 A EP87309679 A EP 87309679A EP 87309679 A EP87309679 A EP 87309679A EP 0267720 A2 EP0267720 A2 EP 0267720A2
Authority
EP
European Patent Office
Prior art keywords
print
print wire
wire guide
flexible
guides
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.)
Withdrawn
Application number
EP87309679A
Other languages
English (en)
French (fr)
Other versions
EP0267720A3 (de
Inventor
John S. Craven
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0267720A2 publication Critical patent/EP0267720A2/de
Publication of EP0267720A3 publication Critical patent/EP0267720A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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

  • This invention relates to flexible print wire guides for positioning the print wires of a dot matrix printer.
  • Dot matrix printers are well known in the art and are commonly used for printing applications. Legible characters are created by means of impinging a small printing wire against a ribbon to print a small dot onto paper or other print media. Matrices of closely spaced dots create the legible graphic patterns or alphanumeric characters of information.
  • serial printers have a cluster of closely spaced print wires which are positioned in the printing head with each print wire having its own solenoid operated actuator.
  • the graphic information or characters in any particular printed line of information are printed one at a time and in sequential order as the printhead moves across the line either from left to right or right to left.
  • a dot pattern stored in a permanent memory built into the printer is utilized to energize the solenoid actuators for the specific print wires needed to form any particular character.
  • a second, and faster system in use with dot matrix printers is called line printing. All of the graphic information or individual alphanumeric characters for the line of information to be printed on the paper are entered into the printer memory.
  • the print head containing the print wires moves horizontally across the page to simultaneously print a complete line of dots for all of the matrices of all of the individual characters to be printed on that particular line.
  • the paper is then advanced a small amount and the next line of dots in the matrices is printed. In this manner all of the graphic information or individual characters for the line of information is printed simultaneously. If a plurality of print wires are used, less horizontal travel across the paper is necessary.
  • Medium speed line printers usually have print heads with up to 132 print wires in parallel spaced relationship, which travel horizontally only a few tenths of an inch.
  • BINGHURST utilizes a bracing system to dampen horizontal displacements of the print styli.
  • Another type of proposed solution can be seen in East German Patent Number 141,137, dated April 16, 1980, wherein the print head plate has an array of resilient tongues, off-set from one another, and equipped with printing style used to generate the dots of the matrix.
  • the device disclosed in East German Patent Number 141,137, if used as disclosed, could be characterized as a serial printer wherein the print head prints a complete vertical line of dots at one time to form a vertical line of the matrix of any particular character as the print head moves horizontally across the paper from left to right.
  • the resilient tongues are subject to alternating compressive and tensional forces. Even if the device were to be rotated 180 degrees so as to function as a horizontal line printer, the identical forces are present.
  • Another object of this invention is to produce a flexible wire guide with reduced mass and increased strength to withstand the frictional and dynamic forces associated with high speed dot matrix printing.
  • a flexible wire guide assembly in which a combination frame and a plurality of angularly shaped flexible print wire guides are stamped or etched from a single plate.
  • the angularly shaped flexible print wire guides are in parallel spaced relationship so as to place the vertices of said angular shaped guides in a straight line or other predetermined pattern.
  • An aperture is formed in the vicinity of the vertex of each angular wire guide.
  • the print wires extend through the vertex apertures and are welded or brazed to the flexible wire guides.
  • the print wires all extend a predetermined length through the vertex apertures of the flexible print wire guides of the assembly for printing or impinging against the ribbon.
  • the other ends of the print wires are directly attached to their associated solenoid drivers which, in turn, are positioned on the print head frame.
  • flexible wire guides 12 are formed as an integral part of plate assembly 11.
  • Figure 1 illustrates flexible wire guide assembly print head 10 having only five sets of flexible wire guides 12 and print wires 13; however, a print head used in a high-speed dot matrix line printer may have as many as 132 print wires 13 and associated flexible wire guides 12.
  • Figure 4, which is a front view of another frame and flexible wire guide assembly 21 illustrates the typical spacing of flexible wire guides for use with a dot matrix line printer. While the flexible wire guides 12 and the associated holes 22 are shown spaced equidistant one from another with holes 22 aligned in a straight line, it is not a requirement that the spacing of the flexible wire guides 12 be uniform or that the holes 22 be aligned in a straight line.
  • the flexible wire guides may be arranged in pairs, each pair separated from another pair by a first distance while each flexible wire guide in each pair is separated one from the other by a second distance.
  • the holes in each pair may be offset one from the other in such a manner that two rows of dots are printed in each pass of the printhead.
  • a primary advantage of plate assembly 11 is that first plate 14, second plate 15, vertical support plate 16 and flexible wire guides 12 are manufactured as an integrated, one piece assembly. This facilitates precise alignment of flexible wire guides 12 and precise positioning of holes 22 (as shown in Figure 4). Additionally, there are substantial costs savings realized as a result of being able to produce the plate assembly as one integrated piece.
  • Plate assembly 11 may be fabricated from a beryllium-copper or similar alloy utilizing a chemical etching process.
  • Print wires 13 extending through holes 22 are held in position by means of brazed joints 17.
  • Figures 5 and 6 shown alternative embodiments to the circular holes 22 as shown in Figure 4.
  • Figure 5 discloses triangular shaped holes 23.
  • the triangular hole can be much larger than the wire yet provide precise alignment if the wire is, after insertion, set into a specified vertex of the triangular aperture. It should be apparent that other configurations of the aperture will provide this same alignment feature as long as it contains at least one vertex.
  • the notches 24 as shown in Figure 6 are another alternative embodiment which also facilitates precise alignment of print wires 13.
  • lower support frame 19 provides rigid support for second plate 15 and holds in position solenoid driver 18.
  • Upper support frame 20 is provided to brace first plate 14.
  • Print wire 13 is directly connected to solenoid driver 18 without any impact type mechanical interface.
  • print wire 13 is thrust forward to impinge upon an ink ribbon, not shown, in order to produce a dot on paper or other print media.
  • Flexible wire guides 12 as are shown in Figure 3, allow the print wires 13 to move forward. In practice it has been found that if print wires 13 are more rigid than the flexible wire guides 12, the angular displacement of the portion of print wires 13 extending through holes 22 in wire guides 12 is minimized, thus allowing the impacting ends of print wires 13 to strike the ribbon squarely, as opposed to at an angle.
  • the lateral displacement of the various print wires 13 has to be, and in fact is, uniform. Hence, the quality of printed characters formed by the dot matrix are uniformly enhanced. Since the displacement of print wires 13 is uniform, the entire line of graphic information or alphanumeric characters is uniformly displaced a minimal amount either to the left or right, depending upon the orientation of the flexible wire guide assembly. Further, since this small displacement is uniform, it may be ignored or, if necessary, may be compensated for by print media placement or offsetting of the wire guide assembly 10.

Landscapes

  • Impact Printers (AREA)
EP87309679A 1986-11-10 1987-11-02 Flexible Drahtführung für Punktmatrixdrucker Withdrawn EP0267720A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92902786A 1986-11-10 1986-11-10
US929027 1986-11-10

Publications (2)

Publication Number Publication Date
EP0267720A2 true EP0267720A2 (de) 1988-05-18
EP0267720A3 EP0267720A3 (de) 1990-05-02

Family

ID=25457203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87309679A Withdrawn EP0267720A3 (de) 1986-11-10 1987-11-02 Flexible Drahtführung für Punktmatrixdrucker

Country Status (2)

Country Link
EP (1) EP0267720A3 (de)
JP (1) JPS63125348A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580426A3 (de) * 1992-07-21 1995-06-14 Seiko Epson Corp Punktdruckkopf für Anschlagdrucker und Anschlagpunktdrucker.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07113422B2 (ja) * 1989-04-07 1995-12-06 株式会社阪上製作所 シール装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134336A (en) * 1977-03-21 1979-01-16 Tally Corporation Half-herringbone support for restricting sideways vibration of comb hammers
DD141137A1 (de) * 1978-12-22 1980-04-16 Ulrich Lasch Druckplatte fuer punktdruckeinrichtungen
JPS6116866A (ja) * 1984-07-03 1986-01-24 Nec Corp 印字ヘツド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580426A3 (de) * 1992-07-21 1995-06-14 Seiko Epson Corp Punktdruckkopf für Anschlagdrucker und Anschlagpunktdrucker.

Also Published As

Publication number Publication date
EP0267720A3 (de) 1990-05-02
JPS63125348A (ja) 1988-05-28

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Inventor name: CRAVEN, JOHN S.