EP0404064A2 - Farbband - Google Patents

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Publication number
EP0404064A2
EP0404064A2 EP90111567A EP90111567A EP0404064A2 EP 0404064 A2 EP0404064 A2 EP 0404064A2 EP 90111567 A EP90111567 A EP 90111567A EP 90111567 A EP90111567 A EP 90111567A EP 0404064 A2 EP0404064 A2 EP 0404064A2
Authority
EP
European Patent Office
Prior art keywords
ink ribbon
ribbon
ink
vertical
horizontal
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Withdrawn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
EP90111567A
Other languages
English (en)
French (fr)
Other versions
EP0404064A3 (de
Inventor
Hirokazu Oki Electric Industry Co. Ltd. Andou
Katsuya Oki Electric Industry Co. Ltd. Kamimura
Iwao Oki Electric Industry Co. Ltd. Hashimoto
Kiyoshi Oki Electric Industry Co. Ltd. Ikeda
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0404064A2 publication Critical patent/EP0404064A2/de
Publication of EP0404064A3 publication Critical patent/EP0404064A3/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Withdrawn legal-status Critical Current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
    • B41J31/00—Ink ribbons; Renovating or testing ink ribbons
    • B41J31/02—Ink ribbons characterised by the material from which they are woven

Definitions

  • This invention concerns an ink ribbon for use in an impact printer.
  • ink ribbons consisted of tapes impregnated with ink which were interposed between a print medium and a print head in a printer, and especially a dot impact printer, for printing.
  • the material of the ribbon was often nylon.
  • Fig. 6A and Fig. 6B show the arrangement of the print medium and ink ribbon. Fig. 6A shows their positions when printing is not being carried out, and Fig. 6B shows their positions during printing.
  • ink ribbon 1 is positioned over print medium 2. Dot matrix printing is carried out when print wire 3 of the print head strikes platen 4 via ink ribbon 1 and print medium 2 so as to transfer the ink with which ink ribbon 1 is impregnated onto print medium 2.
  • the properties required of the fabric of said ink ribbon 1 are as follows:
  • ink ribbon 1 is adjacent to print wire 3, and a space is provided between ink ribbon 1 and print medium 2 so that ink is not transferred to print medium 2 when printing is not being carried out.
  • the gap between the tip of print wire 3 and the surface of platen 4 (referred to hereafter as the "platen-wire gap” (P-W gap), as shown in Fig. 7, is closely related to the time of travel and return of print wire 3. For instance, when the P-W gap is relatively small, the time taken for the print wire to move forward and return to the original position is t1, while when the P-W gap is relatively large, the time taken is t2, which is ⁇ t longer than t1. Thus, the smaller is the P-W gap, the higher is the speed at which printing can be carried out.
  • ink ribbon 1 is compressed to approx. 1/3 of its thickness, and print medium 2 is compressed to approx. 75% of its thickness.
  • the distance over which print wire 3 operates therefore increases by the amount by which ink ribbon 1 is compressed.
  • ink ribbon 1 The thinner is ink ribbon 1, the smaller the platen-­wire gap can be made, and the less the amount of compression that occurs in printing. As a result, the distance over which print wire 3 operates is smaller, and printing can be speeded up.
  • Fig. 8A and Fig. 8B show the ink ribbon when it is installed.
  • Ink ribbon 1 is a tape of width about 5 mm - 30 mm and length about several m - 100 m. It may be in the form of a loop housed in a cassette 6 as shown in Fig. 8A, or in the form of a reel 7 as shown in Fig. 8B, and by passing the ribbon back and forth between the print head 5 and print medium 2, printing may be carried out for long periods.
  • the ribbon must therefore have sufficient strength to withstand long periods of use.
  • the conventional ink ribbons are subject to a force of 10 - 20 kg/mm2 by each print wire when it strikes the ribbon 1. Consequently, if printing is carried out repeatedly over long periods, the strength of ink ribbon declines and the ribbon tears. This decides the useful life of ink ribbon 1.
  • the ribbon tears it may also catch on print wire 3 and damage the wire.
  • the life of the ink ribbon is deemed to have been attained when the ink with which the ribbon 1 is impregnated decreases, and the characters printed by it can no longer be distinguished; or when the strength of the ribbon fabric decreases, and the ribbon feed no longer operates correctly; or when the strength of the ribbon decreases so much that the ribbon tears.
  • the life of the ribbon is deemed to have been reached when the ink with which the ribbon is impregnated has decreased. If the ribbon is impregnated with 20% ink with respect to the weight of ribbon fabric, about 30,000 Chinese characters can be printed per 1 m of ink ribbon, which corresponds to about 200,000 strikes per print wire.
  • the fabric of the ink ribbon must therefore retain sufficient strength even when the printed characters have become too faint to read.
  • This invention aims to provide an ink ribbon which retains sufficient strength even when it is no longer possible to read the characters printed by it, which does not catch on the print wires, and which does not present any risk of damaging the print wires.
  • the fabric of the ribbon is formed by interweaving vertical and horizontal strands wherein the ratio of densities (spatial frequencies) of said vertical and horizontal strands lies in the range 0.70 - 1.43.
  • the fabric of the ribbon is formed by interweaving vertical and horizontal strands wherein the ratio of the densities of said vertical and horizontal strands lies in the range 0.70 - 1.43. It is thus possible to make the ribbon fabric thinner, and ensure that the fabric retains sufficient strength even when the printed characters can no longer be read.
  • Fig. 1 is an electron micrograph showing the strand structure of the ink ribbon in Embodiment 1 of this invention.
  • the distance between the inner ends of short bars "- -" at the bottom margin is 100 ⁇ m).
  • Fig. 2 is a comparison of the specifications of the ink ribbon of this invention and a conventional ink ribbon.
  • the vertical and horizontal strand densities in this example are arranged to be substantially equal.
  • the vertical strand density is 170 strands/inch
  • the horizontal strand density is also 170 strands/inch.
  • the thickness of the ink ribbon fabric then becomes 0.098 mm, which is 0.022 mm less than in conventional ribbons.
  • the, vertical strand density is 190 strands/inch
  • the horizontal strand density is 150 strands/inch.
  • the thickness of the ink ribbon fabric then becomes 0.106 mm, which is 0.014 mm less than in conventional ribbons.
  • the vertical strand density is 150 strands/inch
  • the horizontal strand density is 190 strands/inch.
  • the thickness of the ink ribbon fabric then becomes 0.105 mm, which is 0.015 mm less than in conventional ribbons.
  • Fig. 3 vertical strand density, horizontal strand density and density ratio are marked on the horizontal axis, while the thickness and tensile strength of the ink ribbon fabric are marked on the vertical axis.
  • the thickness of the fabric is small, but the balance between vertical and horizontal tensile strength is upset.
  • Fig. 4 shows the relation between the number of dots printed and tensile strength when the ink ribbons of this invention and a conventional ink ribbon were actually used.
  • ink ribbons of length 100 m were employed.
  • the life of a conventional ink ribbon is approx. 160,000 strikes/m, after which the ribbon tears completely.
  • the ink ribbons of Embodiments 1 - 3 of this invention retain a considerable tensile strength even after approx. 200,000 strikes/m.
  • Fig. 5 shows the relation between tensile strength and density ratio after carrying out a printing test of 200,000 strikes/m on the ink ribbons of Embodiments 1 - 3, and Comparative Examples 1 - 3.
  • the thickness of a strand was said to be 40 denier, but a similar effect is obtained with strands of other thicknesses.
  • the sum of the densities of vertical and horizontal strands is constant, but a similar effect is obtained in other cases.
  • the fabric of the ink ribbon is formed by interweaving vertical and horizontal strands, and the ratio of densities of said vertical and horizontal strands is in the range 0.70 - 1.43. This makes it possible to reduce the thickness of the ink ribbon fabric without decreasing its tensile strength.
  • the platen-wire gap can thus be made small, and the printing speed of a printer, especially a wire dot impact printer, can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
EP19900111567 1989-06-19 1990-06-19 Farbband Withdrawn EP0404064A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15447689A JPH0319882A (ja) 1989-06-19 1989-06-19 インクリボン
JP154476/89 1989-06-19

Publications (2)

Publication Number Publication Date
EP0404064A2 true EP0404064A2 (de) 1990-12-27
EP0404064A3 EP0404064A3 (de) 1991-08-07

Family

ID=15585088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900111567 Withdrawn EP0404064A3 (de) 1989-06-19 1990-06-19 Farbband

Country Status (2)

Country Link
EP (1) EP0404064A3 (de)
JP (1) JPH0319882A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104309340A (zh) * 2014-11-18 2015-01-28 湖州天科特种打印材料有限公司 高打印寿命的色带的生产方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2878590B2 (ja) * 1994-04-07 1999-04-05 フジコピアン株式会社 インクリボン生地
JP2001055902A (ja) 1999-08-18 2001-02-27 Toshiba Corp タービン動翼

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054091A (en) * 1935-11-01 1936-09-15 Cello Rite Ribbon Corp Regenerated cellulose inking machine ribbon
DE1436629A1 (de) * 1963-04-02 1968-11-14 Burlington Industries Inc Farbband fuer Schreibmaschinen,Rechenmaschinen und aehnliche druckende Einrichtungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054091A (en) * 1935-11-01 1936-09-15 Cello Rite Ribbon Corp Regenerated cellulose inking machine ribbon
DE1436629A1 (de) * 1963-04-02 1968-11-14 Burlington Industries Inc Farbband fuer Schreibmaschinen,Rechenmaschinen und aehnliche druckende Einrichtungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Robinson A.T.C. and Marks R.: "Woven Cloth Construction" 1967, Textile Institute, Manchester, UK *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104309340A (zh) * 2014-11-18 2015-01-28 湖州天科特种打印材料有限公司 高打印寿命的色带的生产方法

Also Published As

Publication number Publication date
EP0404064A3 (de) 1991-08-07
JPH0319882A (ja) 1991-01-29

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