US3884148A - Methods of improving printing resolution in chain type printers - Google Patents

Methods of improving printing resolution in chain type printers Download PDF

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Publication number
US3884148A
US3884148A US315193A US31519372A US3884148A US 3884148 A US3884148 A US 3884148A US 315193 A US315193 A US 315193A US 31519372 A US31519372 A US 31519372A US 3884148 A US3884148 A US 3884148A
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United States
Prior art keywords
printing
print
printer
matrix
character
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Expired - Lifetime
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US315193A
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English (en)
Inventor
Louis Bergeron
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Centre National dEtudes Spatiales CNES
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Centre National dEtudes Spatiales CNES
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B41J2/50—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 by the selective combination of two or more non-identical printing elements

Definitions

  • ABSTRACT The method of this invention may be used with a chain type printer presenting a set of characters for printing and having a memory defining one of the set of characters to be printed along a series of positions constituting a print line.
  • Such printers are adapted to be controlled by a program, for example, the printer in IBM Model 1403. Therefore, each of the customary alphanumeric printing characters of said machine is replaced by a discrete printing element having a much smaller printing surface than the customary characters.
  • Each element is arranged in position relative to the character supporting body to print out the programmed character in one position of a matrix form of x elements in y rows.
  • the present invention relates to the printing art and more particularly to a method of printing documents such as weather charts for instance and to means for performing the same.
  • the object of this method is to increase the detail definition on documents printed, by comparison with documents printed by the prior methods.
  • the methods for achieving this objective include recourse to a printing machine of a type well known per se but preferably a chain type high-speed printer equipped with a memory and controllable by a preestablished program.
  • the customary printing characters on such a machine are replaced by a number manifestly larger of ele ments having printing surfaces which are much smaller than those of the customary characters and are differently disposed on the character body to reside in a set of positions for forming a character as a matrix set of the elements.
  • Corresponding instructions are given to the machine to print each element position in the character matrix in order to achieve the desired highdefinition printing.
  • a printer of known type is utilized and its customary printing characters such as in a 135 character alphameric font are replaced by a set printing elements having a much smaller surface to each print out one of a set of matrix positions replacing the former character dimensions.
  • Corresponding instructions are given to the printer to print out the set of printing element positions to form a character matrix.
  • the method may comprise the following steps:
  • the printer is provided with p.N differently arranged printing surfaces (dots or spots);
  • the printer is so controlled as to enable it to print N times on each line and to cause the entirety of said area to be printed with the selected dot or spot array corresponding to the character or print patterns to be made.
  • FIG. 1 shows the manner of dividing up a conventional character in accordance with the invention.
  • FIG. 2 depicts an example of a print to be made.
  • FIG. 3 shows the printer characters to be used to obtain the print in FIG. 2.
  • FIG. 4 shows examples of possible dot shapes in accordance with a more refined aspect of the invention.
  • FIG. I For a preferred embodiment of this invention, consideration is first given to a standard printer character (FIG. I) of rectangular shape measuring approximately 2.5mm by 3.3mm (or more precisely one-tenth inch by one-eighth inch). As shown, this character can be divided into a matrix of four times five square areas or compartments, each compartment being therefore substantially 0.63mm (1/40 inch) square. A dot or other element shape can be provided in each of these squares whereby to obtain very-high-definition printing.
  • the size of the dot may vary.
  • the size of the dots is caused to vary in discrete values to form a set of seven possible dots".
  • their diameter in millimetres may be increased in the following steps:
  • Diametertmm 0.08 0.17 0.26 0.34 0.43 0.5] 0.60 Dot No. I 2 3 4 5 6 7
  • a printer is the IBM 1403, which has normally characters.
  • Printing element C prints a dot with compartment a during a first pass by the printer, after which element C prints a dot with compartment [2 during a second pass, element C prints with compartment 0 during a third pass and element C, with compartment d during a fourth pass.
  • the weight and hence the inertia of the printing elements may remain of the same order as before even though the printing surface is very small. Therefore, because of the increased printing pressure per unit area, strong paper must be used for the printout unless the printer includes means for suitably ad justing the striking pressure.
  • each element print will be coded by a three-position octal number in which the first two positions determine the location of the dot on its support and the third its size (or signal level).
  • Such a code will comprise eight binary bits.
  • level No. 5 in location 13 will be coded 135 in octal or O1 011 101 in binary.
  • This and other similar data relating to the different dots can be stored in the memory and used to control the printer.
  • the underlying principle here consists in relating the apparent shape of the print spot to its level. This permits direct readings of the signal intensity, which could otherwise be more or less difficult to appraise from the size of the spot surface.
  • a weather chart for example, there will be surfaces that encompass a considerable number of dots all of the same level, after the fashion of parallel-oriented small shadings or punctuated blocks, and it will be easy to distinguish between two contiguous areas of different intensity.

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  • Dot-Matrix Printers And Others (AREA)
US315193A 1971-12-15 1972-12-14 Methods of improving printing resolution in chain type printers Expired - Lifetime US3884148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7145081A FR2163353B1 (de) 1971-12-15 1971-12-15

Publications (1)

Publication Number Publication Date
US3884148A true US3884148A (en) 1975-05-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US315193A Expired - Lifetime US3884148A (en) 1971-12-15 1972-12-14 Methods of improving printing resolution in chain type printers

Country Status (3)

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US (1) US3884148A (de)
DE (1) DE2261188A1 (de)
FR (1) FR2163353B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4365550A (en) * 1980-04-11 1982-12-28 Citizen Watch Co., Ltd. Printing mechanism for dot matrix printers
EP0097780A1 (de) * 1982-06-30 1984-01-11 International Business Machines Corporation Punktmatrixdrucker
US4596479A (en) * 1982-06-30 1986-06-24 International Business Machines Corporation Dot matrix printer
US4809021A (en) * 1978-07-07 1989-02-28 Pitney Bowes Inc. Apparatus and method for generating images by producing light spots of different sizes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2466344A3 (fr) * 1979-10-05 1981-04-10 Transac Dev Transact Automat Element de frappe d'une machine a imprimer programmable
DE3009333C2 (de) * 1980-03-11 1985-05-15 Siemens AG, 1000 Berlin und 8000 München Piezoelektrische Tintenspritzeinrichtung zum Darstellen von Halbtonbildern

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1777622A (en) * 1925-07-20 1930-10-07 William C O'hare Picture-copying machine
US3267852A (en) * 1964-12-23 1966-08-23 Smith Kline French Lab Type font particularly adapted for producing chemical notations
US3550148A (en) * 1968-12-24 1970-12-22 Raymond C Machler Process for recording digital information so as to provide an analog representation of such information
US3726379A (en) * 1970-08-24 1973-04-10 Tplot Inc Typehead character raster for plotting

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283702A (en) * 1964-04-20 1966-11-08 Potter Instrument Co Inc High speed printing and graph plotting machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1777622A (en) * 1925-07-20 1930-10-07 William C O'hare Picture-copying machine
US3267852A (en) * 1964-12-23 1966-08-23 Smith Kline French Lab Type font particularly adapted for producing chemical notations
US3550148A (en) * 1968-12-24 1970-12-22 Raymond C Machler Process for recording digital information so as to provide an analog representation of such information
US3726379A (en) * 1970-08-24 1973-04-10 Tplot Inc Typehead character raster for plotting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4809021A (en) * 1978-07-07 1989-02-28 Pitney Bowes Inc. Apparatus and method for generating images by producing light spots of different sizes
US4365550A (en) * 1980-04-11 1982-12-28 Citizen Watch Co., Ltd. Printing mechanism for dot matrix printers
EP0097780A1 (de) * 1982-06-30 1984-01-11 International Business Machines Corporation Punktmatrixdrucker
US4596479A (en) * 1982-06-30 1986-06-24 International Business Machines Corporation Dot matrix printer

Also Published As

Publication number Publication date
FR2163353A1 (de) 1973-07-27
DE2261188A1 (de) 1973-06-28
FR2163353B1 (de) 1976-06-11

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