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EP0024928A1 - Anschlagmosaikdrucker, der mit auf nachgebende Weise fixierten und durch Drucknadeln betätigbaren Druckelementen versehen ist - Google Patents

Anschlagmosaikdrucker, der mit auf nachgebende Weise fixierten und durch Drucknadeln betätigbaren Druckelementen versehen ist Download PDF

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Publication number
EP0024928A1
EP0024928A1 EP80302994A EP80302994A EP0024928A1 EP 0024928 A1 EP0024928 A1 EP 0024928A1 EP 80302994 A EP80302994 A EP 80302994A EP 80302994 A EP80302994 A EP 80302994A EP 0024928 A1 EP0024928 A1 EP 0024928A1
Authority
EP
European Patent Office
Prior art keywords
printing
needles
needle
printing head
line
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Withdrawn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
EP80302994A
Other languages
English (en)
French (fr)
Inventor
Stanley Gordon Scott
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.)
Monotype Corp Ltd
Original Assignee
Monotype Corp Ltd
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 Monotype Corp Ltd filed Critical Monotype Corp Ltd
Publication of EP0024928A1 publication Critical patent/EP0024928A1/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Withdrawn legal-status Critical Current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
    • 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
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires

Definitions

  • This invention relates to a matrix printer, that is to say a machine which prints characters by means of an array including at least one line of striker needles or similar impact members which can be selectively displaced to print on a sheet or other target surface dots or other elementary printing marks in patterns which constitute printed characters.
  • the needles are normally contained in a printing head. In use, the printing head moves relative to the sheet of paper or other printing surface in a direction which is transverse the line or lines of needles in the array. The movement of the printing head is usually stepwise and when the printing head is stationary the printing needles are actuated in accordance with a predetermined programme to strike the sheet or surface through an ink tape or ribbon.
  • the pattern of dots thus printed after a complete traversal of the printing head across the sheet usually constitutes a line of characters of which the maximum height corresponds to the length of the array of printing needles.
  • the quality of characters printed by an impact matrix printer is determined by the size of the impact area of the printing needles. Moreover, the needles are subject to considerable wear and the quality of the characters may be degraded as the striking ends of the needles become worn.
  • One purpose of the present invention is to alleviate at least one of these disadvantages.
  • the invention particularly relates to a matrix printer which comprises a printing head which has an array of striker needles disposed in at least one line, means defining a target surface and means for causing relative movement between the printing head and the said surface along a line transverse the said line of needles.
  • the improvement according to the present invention comprises the provision of a frame which is carried on or adapted for carriage by the printing head and includes a plurality of resiliently flexible members each positioned for displacement by a respective striker needle and carrying a printing member which has, with respect to the target surface, an impact area substantially different from the striking area of the respective striker needle .
  • Figure 1 is an explanatory diagram which shows the impact area 1 of a printing needle aimed to provide a dot at the end of a notional serif 2 at one side of the foot 3 of a character. It will be observed that the impact area of the printing needle is considerably larger than the area which is required to reproduce the end of the serif accurately. There is, obviously, a limit to the extent to which the diameter of a printing needle can be reduced whilst retaining sufficient strength in the printing needle. It is, having regard to the disadvantage shown by Figure 1, desirable to make the impact area of a printing member either smaller than or of different shape to the impact area of the primary printing or striking needle.
  • impact members which may be oval-shaped yet differently oriented to facilitate the production of serifs.
  • needles at the ends of an array may be associated with impact members which are oval and disposed along a line parallel to the line of characters, so that horizontal serifs may be more easily reproduced and to associate with needles between the ends of a line of needles impact members which are oval-shaped and disposed vertically with respect to the characters so as to facilitate the production of vertical serifs.
  • the impact areas of the printing members associated with the needles are of smaller impact area than the impact area of the striker needles.
  • the reference numeral 5 denotes the end of one of a line array of axially displaceable striker needles which project slightly from the end of a printing head 4.
  • the end of the needle has struck a target sheet 6, an inked ribbon 7 being interposed between the needle and the sheet 6. It has been proposed to reduce the impact area of the needle by appropriate shaping of the end but the theoretical benefits of such a proposal are outweighed by the increased wear of the end of the needle and certain difficulties in the manufacture thereof.
  • the assembly shown in Figure 2 includes a resiliently flexible member constituted in this embodiment by a cantilevered leaf spring 8 which carries at or adjacent its free end an anvil 9 on that surface of the leaf spring which faces the respective end of the striker needle.
  • a printing member in the form of a stud 10 which is shaped to present a striking surface of which the area is smaller than or of different shape to the impact area of the needle 5.
  • FIG 3 illustrates schematically the principal parts of a printer.
  • a roller 13 provides support for a sheet of paper 14.
  • Between a supply spool 15 and a take-up spool 16 extends a carbon ribbon 17.
  • the printing head has a body 18 and a front part 19 which carries at its outer end a guide 20 for a line of striker needles which are each axially displaceable by means of drivers within the path 19.
  • the printer is of known form, as shown for example by the earlier-mentioned European patent application.
  • the printer carries a mounting block 21 for a frame in the form of a plate 22 which carries a set of leaf springs and studs.
  • FIG. 4 Within the printing head is, as usual, a row of printing needles 23 (of which only one can be seen in Figure 5.
  • the end of the body 19 of the printing head is circular; from the end of the body there extends the guide 20 which serves to guide the printing needles axially.
  • the needles normally protrude slightly from the end surface 24 of the guide 20.
  • the rectangular mounting block 21 has a central circular aperture which accommodates the guide 20 and is wider at one end so that the mounting block fits over the cylindrical body 19 of the printing head.
  • the block may be fixed to the head by screws or an appropriate cement.
  • a frame for the leaf springs 8 is constituted by the plate 22 of which the central part is of reduced thickness and is formed in the manner of an interdigitated comb comprising side portions 25, and end portions 26, the latter providing a base support for a plurality of cantilevered leaves 8 which extend so that their ends lie on a common line extending across the tops of the needles 23,
  • Each leaf spring 8 is provided with an anvil 9 and a stud 10 as described with reference to Figure 2, the anvil 9 and stud 10 of each leaf spring being aligned with the respective needle 23.
  • the spring plate 22 may be made from nickle- beryllium-copper or pen steel.
  • the anvils and studs may be electrolytically deposited and comprise a suitable hard-wearing material, such as hard nickel.
  • the entire spring plate, studs and anvils may be photo-etched from a single sheet of any of the aforementioned materials, the studs and anvils being plated with a suitable hard-wearing material such as chromium.
  • the sizes and shapes of the studs 10 are selected as required. They may simply be of smaller diameter than the needles 23 but may be shaped as thin bars or lozenges.
  • the leaf spring assembly may be arranged to include leaf springs to provide resilient mounting for two corresponding rows of anvils and studs.
  • the studs of one such row may have striking surfaces in the form of thin bars aligned in one direction whereas the studs in the other row may have striking surfaces in the form of thin bars in another direction, the directions being selected to permit or facilitate the formation of fine horizontal and vertical character strokes or serifs.
  • the frame constituted by the plate 22 may be readily detachable from the block 21 so that it can be changed when the studs become worn or when a different shape of stud is required for the production of different style of character.
  • the plate 22 may be attached by screws to the block 21 but, if easy removal is not required, the plate 22 may be fixed to the block by a suitable cement.

Landscapes

  • Impact Printers (AREA)
EP80302994A 1979-08-30 1980-08-29 Anschlagmosaikdrucker, der mit auf nachgebende Weise fixierten und durch Drucknadeln betätigbaren Druckelementen versehen ist Withdrawn EP0024928A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7930013A GB2057359A (en) 1979-08-30 1979-08-30 Matrix printer
GB7930013 1979-08-30

Publications (1)

Publication Number Publication Date
EP0024928A1 true EP0024928A1 (de) 1981-03-11

Family

ID=10507488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80302994A Withdrawn EP0024928A1 (de) 1979-08-30 1980-08-29 Anschlagmosaikdrucker, der mit auf nachgebende Weise fixierten und durch Drucknadeln betätigbaren Druckelementen versehen ist

Country Status (3)

Country Link
EP (1) EP0024928A1 (de)
JP (1) JPS5664879A (de)
GB (1) GB2057359A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107399085A (zh) * 2017-09-15 2017-11-28 贵州大学 3d打印机自带丝盘固定架

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS583880A (ja) * 1981-06-30 1983-01-10 Seikosha Co Ltd クロスハンマ式ドツトプリンタ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2152187A5 (de) * 1971-09-09 1973-04-20 Anker Werke Ag
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
GB1493719A (en) * 1974-07-04 1977-11-30 Siemens Ag Mechanical printers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2152187A5 (de) * 1971-09-09 1973-04-20 Anker Werke Ag
GB1493719A (en) * 1974-07-04 1977-11-30 Siemens Ag Mechanical printers
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107399085A (zh) * 2017-09-15 2017-11-28 贵州大学 3d打印机自带丝盘固定架

Also Published As

Publication number Publication date
JPS5664879A (en) 1981-06-02
GB2057359A (en) 1981-04-01

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820215

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCOTT, STANLEY GORDON